spinal cord and spinal nerves_a+p

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BIO 204

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Dec 6, 2023

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2 PRE-LAB EXERCISES When studying the spinal cord and spinal nerves, it’s important to know how to distinguish between the following key structures. • Neurons: Nervous system cells that conduct electrical signals via axons • Axons: Neuronal processes that connect with different neurons, muscles, and glands • Nerves: Bundles of axons that travel together in the peripheral nervous system • Tracts: Bundles of axons that travel together in the central nervous system • Descending tracts: Bundles of axons that carry motor signals down the spinal cord before leaving the spinal cord and entering the ventral roots • Ascending tracts: Bundles of axons that carry sensory signals up the spinal cord toward the brain • Association neurons: Cells of the CNS that integrate incoming information and decide which responses (if any) are required • Fibers: This generic term can refer to either axons or nerves in the nervous system. Open the A&P app, and from the left-side menu, select Nervous System and Special Senses. You are responsible for the identification of all bold terms .
3 A. Explore the 3D anatomical view in Module 17.3 Central Nervous System and answer the following questions. Brain Vertebral column Spinal cord 1. The nervous system is anatomically separated into two parts. The ___________________ and the _______________________________ make up the central nervous system (CNS) . 2. Together, the brain and spinal cord function as the body’s ____________________________________________ _____________________. 3. Select the spinal cord from the left-side menu and use the book icon to read its definition. a. The spinal cord is found within the spinal canal of the _________________________________________ ________________________.
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4 b. The spinal cord extends from the upper border of the _______________________________ to the lower border of the first, or upper border of the second, _______________________________. c. Above the vertebral (spinal) column , the spinal cord is continuous with the _________________. d. In the lumbar region , the spinal cord ends in a conical extremity called the ___________________. e. Like the brain, the spinal cord is surrounded by three connective tissue layers, or membranes, called _______________________________.
5 B. Open the illustration slideshow in Module 18.2 Neuron Histology, examine Slide 1 – Neuron Structure, and answer the following questions. (Note: You can also use the dots under the image to examine a series of histology micrographs and learn about how the structure of myelinated and unmyelinated axons facilitates their functions.) 1. The nervous system cells that transmit signals are called _____________________________________. 2. The region of a neuron that contains the nucleus is called the _____________________________________. 3. The neuronal processes that receive information are called ____________________________________. 4. The neuronal process that generates and transmits electrical signals is called the ___________________. (Fun fact: The generic term for a neuronal process is “neurite.”)
6 IN-LAB EXERCISES: Use the following modules in Visible Body’s Anatomy & Physiology app to guide your exploration of the spinal cord and spinal nerves. Be sure to select the book icon under the structure names to learn more about the structures you are exploring. You are responsible for the identification of all bold terms and all answers to the questions. A. Explore the 3D anatomical view in Module 19.1 Spinal Cord and answer the following questions. Spinal cord Conus medullaris Cauda equina
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7 1. Select the spinal cord from the left-side menu and use the book icon to read its definition. a. The spinal cord contains two basic types of cells, the _______________________________ and _______________________________. b. The spinal cord ends in the _______________________________ region, but fibers extend from there to lower regions of the spinal canal. c. The spinal cord ends in a conical structure called the _______________________________. Fibers from the lower end of the spinal cord form the _______________________________, which extends to the coccyx . Spinal nerves Coccyx Sacrum Meninges (dura mater)
8 2. Refresh the view and double tap the sacrum at the bottom of the spine. Use the Hide tool to remove the sacrum from the view. Locate the cauda equina (meaning “horse’s tail” in Latin) and the very thin filum terminale that extends to the coccyx. What forms these structures? Note: Because the lower regions of the spinal canal do not contain any spinal cord, it is safe to sample CSF from here using a procedure called a spinal tap . 3. Select the meninges from the left-side menu and use the book icon to read their definition. a. From innermost to outermost, list the three meninges that protect the spinal cord. b. Between the outermost meninges and the vertebral canal is the ______________________________ space, which contains loose areolar connective tissue, adipose tissue, and blood vessels. (Hint: When someone gets an “epidural,” the injection is delivered into this space.) c. With the meninges selected, pan the view to see their full extent. How far down the spinal column do the meninges extend? 4. Select the vertebral column from the left-side menu and use the book icon to read its definition. a. Regions of the spinal cord are named for the regions of the vertebral column (spinal column) they occupy. What are the five regional groupings of vertebrae ? b. Which of these regions contains the spinal cord? c. The spinal cord passes through channels in the vertebrae called _______________________________. d. Spinal nerves , which leave the spinal cord and enter the periphery, pass though apertures in the vertebral column called ______________________________________.
9 B. Examine the illustration in Module 19.2 Spine Cross Section and explore the 3D anatomical views in Modules 19.3 Spinal Nerve Roots, 19.5 Sensory Signals, and 19.6 Motor Commands. Use these modules to answer the following questions. Spinal cord T03 Ventral root T03 Dorsal root T03 Spinal nerve
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10 1. In Module 19.2 Spine Cross Section, observe how the spinal nerves leave the spinal cord as left and right pairs of roots . On the posterior side of the spinal cord are the _______________________________ roots and on the anterior side are the _______________________________ roots. 2. The roots join to leave the spinal cord as spinal nerves on either side. As soon as they exit the vertebral column, they branch into dorsal and ventral _______________________________, which branch further to supply the entire body. 3. In the following image, label the epidural space , dura mater , arachnoid mater , and subarachnoid space . 4. Use the right arrow at the bottom of the left-side menu to open Module 19.3 Spinal Nerve Roots. (Note: You can also refer to the 3D anatomical views in Modules 19.5 Sensory Signals and 19.6 Motor Commands to help you answer the following questions). a. What is the function of the spinal nerves? b. Select the spinal nerves from the left-side menu. The spinal nerves and their branches supply the entire body and make up most of the peripheral nervous system . Select the dorsal roots from the left-side menu to highlight them in the view. The dorsal roots transmit _______________________________ signals. c. Motor commands (motor signals) originate in the CNS and travel down the spinal cord toward the periphery to trigger an action. Actions are either ___________________________________________ or _____________________________________________. d. Select the ventral roots from the left-side menu to highlight them in the view. The ventral roots transmit _______________________________, or efferent , signals from the CNS. e. Select the dorsal root ganglia from the left-side menu to highlight them in the view. Ganglia are collections of _______________________________ that process incoming, or afferent , signals from the periphery.
11 C. Explore the illustration slideshow in Module 19.4 Spinal Cord Histology and answer the following questions. 1. First, examine the illustration in Slide 1 – Gray and White Matter to learn about how spinal cord tissue forms two regions that are named for their color. As you answer the following questions, keep in mind that because humans walk on two legs and face forward, “ventral” and “anterior” are synonymous, as are “dorsal” and “posterior.” a. The butterfly-shaped (H-shaped) area in the center of the spinal cord consists of _______________________________. Each lateral “wing” forms three _______________________________. i. What are the names of these three structures? ii. What are the functions of these structures? b. Surrounding the gray matter is the _______________________________ matter.
12 i. This tissue is organized into _______________________________ that send signals up and down the spinal cord. (Note: They are so-named because groups of axons that travel together through the spinal cord are bundled into column-shaped groups.) ii. Locate the three columns of white matter on either side of the spinal cord. These are the _____________________________________________________________ columns. c. Branches of the dorsal roots join with the _______________________________ gray horns and branches of the ventral roots join with the _______________________________ gray horns. 2. Select the second dot under the image to examine the micrographic image in Slide 2 – Gray Matter: Anterior Horn. a. What does gray matter consist of? b. The posterior horns consist of ____________________________________________ that receive sensory input from axons conveying information about ___________________________________________. c. The anterior horns consist of ________________________________________________ that facilitate _________________________________________ movement. d. The left and right gray matter horns are connected by the _______________________________. Find this structure in the image. e. In the very center of the gray matter is a fluid-filled, tube-shaped space called the _______________________________ that runs through the entire spinal cord. The fluid inside this space is called _______________________________. f. Lateral horns consist of _________________________________________________that supply the _______________________________. They are found only in the _______________________________ and __________________________________ regions of the spinal cord. 3. Select the third dot under the image to examine the micrographic image in Slide 3 – White Matter. a. What does white matter consist of?
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13 b. What gives white matter its color? c. Axons carrying signals up the spinal cord, toward the brain, are called __________________________ axons. Axons carrying signals down the spinal cord, toward the periphery, are called _______________________________ axons. d. In the following statements, circle the correct answers. Motor signals are carried by ascending / descending axons. Sensory signals are carried by ascending / descending axons. e. Axons that cross from one side of the spinal cord to the other are called ______________________________________. D. Examine the illustrations in Modules 19.7 Spinal Nerves and 19.9 Dermatomes, explore the 3D anatomical view in Module 19.8 Spinal Nerve Regions, and answer the following questions.
14 Thoracic nerves (T01-T12) Cervical nerves (C01-C08) Lumbar and sacral nerves (L01-S05) Dermatomes
15 1. In Module 19.7 Spinal Nerves, observe how spinal nerves are organized according to the regions of the _______________________________ from which they arise. 2. Many spinal nerves form anastomosing networks called _____________________________ that innervate specific regions of the body. In the following statements, fill in the blanks. a. The _______________________________ plexus innervates the neck and thoracic regions. b. The brachial plexus innervates the ___________________________________________. c. The _____________________ and ___________________ plexuses innervate the lower limbs and the pelvis. These two plexuses are often grouped together and called the ____________________________. 3. Use the right arrow at the bottom of the left-side menu to open Module 19.8 Spinal Nerve Regions. Spinal region names are usually abbreviated. For example, the fifth cervical nerve is abbreviated as “C5” or “C05.” a. There are _________ pairs of cervical nerves, __________ pairs of thoracic nerves, _________ pairs of lumbar nerves and _________ pairs of sacral nerves. b. What is the abbreviation for the tenth thoracic spinal nerve? c. Which spinal nerves innervate the neck? d. Which spinal nerves innervate the regions between the ribs? e. Which spinal nerves innervate the feet? 4. Use the right arrow at the bottom of the left-side menu to open Module 19.9 Dermatomes. a. What is a dermatome ?
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16 b. What does “derma-” mean? c. All the spinal nerves carry sensory fibers from the skin except _______________________________ . The sensory input from the skin of the facial region travels along _______________________________, which is also called the ________________________________ nerve. (Note: Chickenpox is caused by the varicella zoster virus. Some of the virus can lodge inside spinal nerves and reappear years later, as they become reactivated and travel down the axons to erupt into the dermatome served by that nerve. It is an extremely painful disease.) i. The dermatome that includes the little finger is innervated by ______________________________. E. Explore the 3D anatomical views in Modules 19.10 Cervical Plexus and 19.11 Cervical Innervation and answer the following questions. Lesser occipital nerve Great auricular nerve Transverse cervical nerve Supraclavicular nerve Phrenic nerve
17 1. In Module 19.10 Cervical Plexus, select the cervical plexus from the left-side menu and use the book icon to read its definition. (Note: You can refer to Module 19.11 Cervical Innervation to observe the structures that are innervated by the cervical plexus nerves.) a. The cervical plexus derives from the _______________________________ rami of spinal nerves _______________________________. b. The cervical plexus supplies the skin and muscles of the _______________________________. c. C01 is also called the _______________________________. It supplies _______________________________. d. The cervical plexus contains two groups of branches: the _______________________________ and the _______________________________. e. In the following statement, circle the correct answer: Most branches of the cervical plexus supply the skin / muscles / bones / glands . f. The _______________________________ nerve contains both sensory and motor fibers. It supplies the _______________________________ and is important for _______________________________. 2. Select each cervical plexus nerve from the left-side menu and use the book icon to read its definition. Then, complete the following table by noting the origin and innervations of each nerve. Origin Nerve Innervations Transverse cervical Lesser occipital Great auricular Supraclavicular Phrenic C02–C03 The skin of the anterior neck
18 F. Explore the 3D anatomical views in Modules 19.12 Brachial Plexus, 19.13 Brachial Innervation I, 19.14 Brachial Innervation II, and 19.15 Brachial Innervation III. Use these modules to answer the following questions. Cords Divisions Trunks Spinal nerves (C05-C08) Dorsal scapular nerve Lower subscapular nerve Thoracodorsal nerve Suprascapular nerve Axillary nerve
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19 Radial nerve Median nerve Ulnar nerve Medial antebrachial cutaneous nerve Nerve to the subclavius Lateral pectoral nerve Musculocutaneous nerve Medial pectoral nerve
20 1. In Module 19.12 Brachial Plexus, select the brachial plexus from the left-side menu and use the book icon to read its definition. a. The brachial plexus branches to supply the skin and muscles of the ____________________________ and ____________________________. b. Brachial plexus nerves arise mostly from the ______________________________ rami of spinal nerves _______________________________, with a few from _______________________________. c. The upper part of the brachial plexus is divided into _______________________________, _______________________________ and _______________________________. 2. Select trunks from the left-side menu to highlight them in the view and use the book icon to review the brachial plexus definition. a. How many trunks are there on each side? b. What are the names of these trunks? 3. Select the divisions from the left-side menu to highlight them in the view and use the book icon to review the brachial plexus definition. a. The divisions arise from the _______________________ as they pass under the ___________________. b. Each one splits into an _________________________ division and a ________________________ division. 4. Select the cords from the left-side menu to highlight them in the view and use the book icon to review the brachial plexus definition. a. How many cords are there on each side? b. The cords are named for ________________________________________________________. c. Give the names of the cords and describe how they are formed.
21 5. Use the right arrow at the bottom of the left-side menu to open Module 19.13 Brachial Innervation I and learn about the brachial plexus nerves that supply the shoulder and upper back . Select each nerve from the left-side menu and use the book icon to read its definition. Then, complete the following table by noting the origin and innervations of each nerve. 6. Use the right arrow at the bottom of the left-side menu to open Module 19.14 Brachial Innervation II and learn about the brachial plexus nerves that supply the chest and arm . Select each nerve from the left-side menu and use the book icon to read its definition. Then, complete the following table by noting the origin and innervations of each nerve. Origin Origin Nerves Nerves Innervations Innervations Dorsal scapular Medial pectoral Subscapular Musculocutaneous Suprascapular Lateral pectoral Thoracodorsal Nerve to the subclavius Axillary d. The cords produce ____________________________ and ____________________________ branches that become the nerves in the____________________________ and the ____________________________.
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22 7. Use the right arrow at the bottom of the left-side menu to open Module 19.15 Brachial Innervation III and learn about the brachial plexus nerves that supply the forearm and hand . Select each nerve from the left-side menu and use the book icon to read its definition. Then, complete the following table by noting the origin and innervations of each nerve. Origin Nerves Innervations Median Radial Ulnar Median antebrachial cutaneous
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23 G. Explore the 3D anatomical views in Modules 19.16 Lumbosacral Plexus I, 19.17 Lumbosacral Plexus II, and 19.18 Lumbosacral Innervation. Use these modules to answer the following questions. Iliohypogastric nerve Genitofemoral nerve Lateral femoral cutaneous nerve Ilioinguinal nerve Femoral nerve Obturator nerve Sciatic nerve Pudendal nerve Posterior femoral cutaneous nerve Gluteal nerve
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24 Hip muscles Pelvic muscles Abdominal muscles Lumbosacral plexus Leg muscles 1. In Module 19.16 Lumbosacral Plexus I, select the lumbosacral plexus from the left side menu and use the book icon to read its definition. a. Which body regions are supplied by the lumbosacral plexus? b. The nerves of the lumbosacral plexus arise from the _____________________________ rami and the _______________________________ segments of spinal nerves _______________________________. c. The lumbosacral plexus can be functionally divided into the _______________________________ and the _______________________________. d. The lumbar plexus nerves arise from spinal nerves _______________________________. e. Name the three major nerves of the lumbar plexus. f. The sacral plexus nerves arise from spinal nerves _______________________________. g. Name the two major nerves of the sacral plexus.
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25 2. Select each upper lumbosacral nerve from the left-hand menu and use the book icon to read its definition. Then, complete the following table by noting the origin and innervations of each nerve. Origin Nerves Innervations Iliohypogastric Ilioinguinal Genitofemoral Obturator Femoral Lateral femoral cutaneous 3. Use the right arrow at the bottom of the left-side menu to open Module 19.17 Lumbosacral Plexus II. Select the sciatic nerve from the left-side menu and use the book icon to read a description of the sciatic nerve, which is the thickest and longest nerve in the body. a. The sciatic nerve originates from spinal nerves _______________________________. b. The sciatic nerve directly innervates the ______________________________________________________ muscles and then branches at the ____________________________ into the ____________________________ and _______________________________ nerves that innervate the muscles of the distal leg and foot.
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26 4. Select each lower lumbosacral nerve from the left-side menu and use the book icon to read its definition. Then, complete the following table by noting the origin and innervations of each nerve. Origin Nerves Innervations Gluteal Pudendal Posterior femoral cutaneous Fibular Posterior femoral cutaneous 5. Use the right arrow at the bottom of the left-side menu to open Module 19.18 Lumbosacral Innervation. Select the lumbosacral plexus from the left-side menu and use the book icon to review its definition. a. The lumbosacral plexus innervates many regions of the _______________________________ and the muscles of the _______________________________________________. b. Select each muscle group in the left-side menu to observe the location of the abdominal muscles, hip and gluteal region muscles, pelvic muscles, and leg and foot muscles. Use the book icon to read a description of each muscle group.
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27 H. Watch the video in Module 19.19 Somatic Reflex Arc, explore the 3D anatomical view in Module 19.20 Path of Reflex Arc, and answer the following questions. Spinal cord Dorsal root Spinal nerve Ventral root
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28 1. In Module 19.19 Somatic Reflex Arc, watch the video and read the text to learn about how some somatic muscles, normally under voluntary control, can be recruited for an involuntary reflexive movement that protects the body. Somatic reflexes need to be fast. They occur before messages about the action reach the _______________________________. 2. The route the reflex signals take is known as the _______________________________. Signals are transmitted from the periphery to the _______________________________, which then sends motor signals back out to muscles that respond quickly to protect the body. a. The reflex arc begins when a _______________________________ detects a dangerous stimulus. b. The afferent signal reaches the gray matter of the spinal cord, where cell bodies of _______________________________ interpret the signal. c. If a response is required, it will be sent to an _______________________________ neuron, and its axons will exit the spinal cord and stimulate the appropriate muscle. 3. Use the right arrow at the bottom of the left-side menu to open Module 19.20 Path of Reflex arc. a. Select the spinal nerve from the left-side menu to highlight it in the view. Signals of a reflex arc pass from the _______________________________ through afferent fibers of a spinal nerve. b. Select the dorsal root from the left-side menu to highlight it in the view. Sensory input traveling through spinal nerves enters the spinal cord via the _______________________________ root. c. Select the spinal cord from the left-side menu to highlight it in the view. Signals are processed in the _______________________________ matter of the spinal cord by association neurons. d. Select the ventral root from the left-side menu to highlight it in the view. If a signal requires a response, it is passed to motor neurons that send motor signals through their axons out of the spinal cord through the _______________________________ roots.
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29 PUTTING IT ALL TOGETHER 1. The spinal cord is found inside the _________________________ foramina of _________________________ and ____________________________ vertebrae. 2. A fluid called ____________________________ flows through the center of the spinal column in the ____________________________. 3. ______________________ matter is found in the center of the spinal cord. It is made up of ___________________________________________________________. It is divided into three _________________________ on either side. 4. _____________________ matter is found on the outside of the spinal cord. It is made up of _______________________________ and is organized into _______________________________. Axons of the white matter carry information either up or down the spinal cord. 5. Fibers that bring sensory information from the periphery to the CNS are called _______________________ or _______________________ fibers. Fibers that carry information from the CNS to the periphery are called _______________________ or _________________________ fibers. 6. The peripheral nervous system mostly consists of the branches of the spinal nerves. Spinal nerves begin as (left and right) dorsal and ventral _______________________________. 7. These roots join briefly to form ___________________________ as they leave the vertebral column via the _______________________________. Once these nerves leave the spinal column, they become part of the peripheral nervous system. 8. Soon after they leave the spinal column, spinal nerves branch into dorsal and ventral ________________. 9. Branches of the spinal nerves form complex networks called _______________________________. The three main ones are the ______________________________________________________________.
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30 10. When immediate action is required to protect the body, some skeletal muscles can be recruited by a spinal __________________________. These rapid movements are controlled by a series of cell connections called a __________________________. Sensory information sent from _____________________________ travels via sensory axons into the gray matter of the spinal cord, where ________________________________ process (integrate) them. These cells pass the signal on to _____________________________, which in turn stimulate muscles to contract without any input from the brain. TIME TO PRACTICE! GO TO THE QUIZZES MENU AND COMPLETE NERVOUS SYSTEM QUIZZES 19.A AND 19.B.
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31
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32 Module 17.3 Central Nervous System
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33 Module 19.1 Spinal Cord (Part 1)
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34 Module 19.1 Spinal Cord (Part 2)
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35 Module 19.3 Spinal Nerve Roots
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36 Module 19.8 Spinal Nerve Regions
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37 Module 19.10 Cervical Plexus
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38 Module 19.12 Brachial Plexus
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39 Module 19.13 Brachial Innervation I
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40 Module 19.14 Brachial Innervation II
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41 Module 19.15 Brachial Innervation III
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42 Module 19.16 Lumbosacral Plexus I
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43 Module 19.17 Lumbosacral Plexus II
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44 Module 19.18 Lumbosacral Innervation
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45 Module 19.20 Path of Reflex Arc
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