Explanation Spinal nerves are known to be mixed as they are made from the union of the anterior as well as the posterior root. The posterior one is responsible for sending the sensory stimuli coming from the peripheral nervous system toward the central region of the nervous system (CNS). On the other hand, the anterior root is responsible for sending the somatic as well as the visceral motor signals from the CNS toward the peripheral region of the nervous system (PNS). When both these roots join together in the spinal nerve, they comprise both motor as well as sensory axons...

Human Anatomy & Physiology (2nd Edition)

2nd Edition

ISBN: 9780134553511

Author: Erin C. Amerman

Publisher: PEARSON

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Question

Chapter 13.3, Problem 1QC

Summary Introduction

To review:

The structures that form the spinal nerve and the reasons behind all spinal nerves being mixed.

Introduction:

The spinal nerves generate from the spinal cord and extend up to the neck and head. They contain a bundle of nerves that connects exterior and interior parts of the body. The total number of spinal nerves is 31 and they contain both motor neurons and sensory neurons. The spinal nerve contains fascicles, endoneurium, myelinated axon, and unmyelinated axon of the neurons.

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Chapter 13.2, Problem 5QC

Chapter 13.3, Problem 2QC

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Chapter 13 Solutions

Human Anatomy & Physiology (2nd Edition)

Ch. 13.1 - What two subclasses make up the sensory division...Ch. 13.1 - 2. What is a lower motor neuron? How are upper...Ch. 13.1 - In what ways do the somatic and visceral motor...Ch. 13.1 - Prob. 4QC Ch. 13.1 - Prob. 5QC Ch. 13.1 - What structures are found in a peripheral nerve?Ch. 13.1 - How are sensations detected in the PNS and...Ch. 13.1 - 8. How are motor impulses transmitted from the...Ch. 13.2 - Prob. 1QC Ch. 13.2 - 2. What are the Roman numerals and main...

Ch. 13.2 - 3. What are the Roman numerals and main...Ch. 13.2 - List the 12 pairs of cranial nerves in ascending...Ch. 13.2 - Prob. 5QC Ch. 13.3 - Prob. 1QC Ch. 13.3 - What are the anterior and posterior rami, and what...Ch. 13.3 - 3. What are the key structures supplied by each...Ch. 13.3 - 4. Differentiate between the trunks and cords of...Ch. 13.3 - Prob. 5QC Ch. 13.3 - Prob. 6QC Ch. 13.3 - Prob. 7QC Ch. 13.4 - 1. What is sensory transduction? Ch. 13.4 - Prob. 2QC Ch. 13.4 - 3. What are the three components of a typical...Ch. 13.4 - What is a first-order sensory neurons receptive...Ch. 13.4 - What is the two-point discrimination threshold,...Ch. 13.4 - What is a dermatome?Ch. 13.4 - 7. Why is visceral pain often perceived as...Ch. 13.5 - 1. What are the main differences between an upper...Ch. 13.5 - 2. What is a motor neuron pool? Ch. 13.5 - What is the general sequence of events for...Ch. 13.6 - Prob. 1QC Ch. 13.6 - 2. How do intrafusal and extrafusal muscle fibers...Ch. 13.6 - What are the functions of primary and secondary...Ch. 13.6 - 4. How do Golgi tendon organs and muscle spindles...Ch. 13.6 - How do polysynaptic and monosynaptic reflex arcs...Ch. 13.6 - Prob. 6QC Ch. 13.6 - How are the flexion and crossed-extension reflexes...Ch. 13.6 - What are some potential effects of sensory...Ch. 13.6 - How do upper and lower motor neuron disorders...Ch. 13 - Mark the following statements as true or false. If...Ch. 13 - Prob. 2CYR Ch. 13 - 3. Define each of the following terms in your own...Ch. 13 - First, write the Roman numeral that corresponds to...Ch. 13 - Prob. 5CYR Ch. 13 - Match the following nerves with the structures...Ch. 13 - First-order somatic sensory neurons are...Ch. 13 - Prob. 8CYR Ch. 13 - Prob. 9CYR Ch. 13 - 10. Merkel cell fibers, tactile corpuscles,...Ch. 13 - 11. Place the following sequence of events for the...Ch. 13 - How do upper and lower motor neurons differ?Ch. 13 - 13. List and describe the basic steps involved in...Ch. 13 - 14. The lower motor neurons that innervate...Ch. 13 - Fill in the blanks:______ detect the degree to...Ch. 13 - Which of the following is the correct order of...Ch. 13 - 17. Mark the following statements as true or...Ch. 13 - Prob. 18CYR Ch. 13 - Prob. 1CYU Ch. 13 - Prob. 2CYU Ch. 13 - Prob. 3CYU Ch. 13 - Prob. 1AYKA Ch. 13 - Jason presents for evaluation after a severe...Ch. 13 - 3. When Mr. Williams goes to the emergency...Ch. 13 - 4. Maria is a 3-year-old who has been diagnosed...Ch. 13 - Another feature of CIPA is anhidrosis, or the...

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Solution Summary: The author explains the structures that form the spinal nerve and the reasons behind it being mixed.

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