Concept explainers
Visit this site (http://openstaxcollege.org/l/troublewstairs) to read about a woman that notices that her daughter is having trouble walking up the stairs. This leads to the discovery of a hereditary condition that affects the brain and spinal cord. The electromyography and MRI tests indicated deficiencies in the spinal cord and cerebellum, both of which are responsible for controlling coordinated movements. To what functional division of the nervous system would these structures belong?
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- A presynaptic neuron in the cerebrum transmits information to hundreds of other neurons. This process is an example of (a) convergence (b) divergence (c) temporal summation (d) spatial summation (e) a graded potentialarrow_forwardsome blanks may be filled with more than one term; some terms may be used more than once, some terms may not be used) ACh (acetylcholine) Brainstem CN I CN II CN III CN IV CN IX CN V CN VI CN VII CN VIII CN X CN XI CN XII Ganglionic parasympathetic neurons Ganglionic sympathetic neurons Lateral horn of spinal cord segments T1-L2 Lateral gray matter of spinal cord segments S2-S4 Medulla oblongata Midbrain NE (norepinephrine) Parasympathetic Paravertebral ganglia Parasympathetic autonomic ganglia Pelvic splanchnic nerve Pons Postganglionic parasympathetic neurons Postganglionic sympathetic neurons Preganglionic parasympathetic neurons Preganglionic sympathetic neurons Prevertebral ganglia Spinal cord segment C1-C4 Spinal cord segment C5-T1 Spinal cord segment T1-L2 Spinal cord segment L1-L4 Spinal cord segment L4-S4 Spinal cord segment S2-S4 Somatic motor neurons Somatic sensory neurons Sympathetic Sympathetic chain ganglia Sympathetic trunk ganglia Visceral sensory neurons…arrow_forwardVisit this site (http://openstaxcollege.org/l/NYTmotor) to read about an elderly woman who starts tolose the ability to control fine movements, such as speechand the movement of limbs. Many of the usual causes wereruled out. It was not a stroke, Parkinson’s disease, diabetes,or thyroid dysfunction. The next most obvious cause wasmedication, so her pharmacist had to be consulted. Theside effect of a drug meant to help her sleep had resultedin changes in motor control. What regions of the nervoussystem are likely to be the focus of haloperidol side effects?arrow_forward
- Visit this site (http://openstaxcollege.org/l/neurolab)to see a virtual neurophysiology lab, and to observeelectrophysiological processes in the nervous system,where scientists directly measure the electrical signalsproduced by neurons. Often, the action potentials occur sorapidly that watching a screen to see them occur is nothelpful. A speaker is powered by the signals recorded froma neuron and it “pops” each time the neuron fires an actionpotential. These action potentials are firing so fast that itsounds like static on the radio. Electrophysiologists canrecognize the patterns within that static to understand whatis happening. Why is the leech model used for measuringthe electrical activity of neurons instead of using humans?arrow_forwardWatch this video (http://openstaxcollege.org/l/motorpathway) to learn more about the descending motorpathway for the somatic nervous system. The autonomicconnections are mentioned, which are covered in anotherchapter. From this brief video, only some of the descendingmotor pathway of the somatic nervous system is described.Which division of the pathway is described and whichdivision is left out?arrow_forwardSpinal Cord Gray Matter Fill in the blanks with the terms provided. interneurons lateral center gray commissure sensory neurons gray matter posterior anterior The gray matter in the spinal cord is located in the shape resembles a letter H, or a butterfly. The cell bodies of somatic motor neurons are primarily housed in the and its horns, which innervate skeletal muscle. The cell bodies of autonomic motor neurons are found in the horns and innervate cardiac and smooth muscle, and glands. Left and right masses of are the posterior horns. The axons of located in the and the cell bodies of horns. The of gray matter that surrounds a narrow central canal. are is a horizontal bar Resetarrow_forward
- Traumatic damage to the spinal cord is common. Based on the information in Figure 2 and Table 2, is it possible that an entire column of white matter could be damaged without causing any problems with movement? Explain your answer carefully and thoroughly.arrow_forwardPlease explain what cerebral spinal fluid (CSF) is, how it is made (structures involved); and discuss its complete circulation. EXPLANATION ADDRESSING THE QUESTION ABOVE Cerebral spinal fluid is a fluid that cushions the central nervous system and provides buoyancy to and helps nourish the brain. It circulates around the surface of the brain, interior ventricles, and surface of the spinal cord and central canal of the spinal cord. CSF is created by the ependymal cells in the choroid plexus and ventricles of the brain. CSF is made up mostly of water and also includes ions, nutrients like vitamin c and protein, and can pick up waste as it circulates. CSF circulation starts in the lateral ventricle where the choroid plexus and lateral ventricle creates or secretes the CSF. The CSF then flows through the ventricular foramen into the third ventricle. At the third ventricle, the CSF then flows through the cerebral aqueduct into the fourth ventricle. Then, the CSF exits the fourth…arrow_forwardA bit confused about this question I placed my answer below the question but not sure if the brain is synonymous or not with the peripheral nervous system due to the wording of the question. In the background section the authors wrote “Neurodegenerative disease are progressive conditions that occur through impairment in the function or structure of neurons in the peripheral nervous system or brain [1].’ Based on this quote, is the “or brain” statement synonymous with the peripheral nervous system or is the “or brain” statement in addition to the peripheral nervous system? The nerves outside of the brain and spinal cord are part of the peripheral nervous system. The main function of the peripheral nervous system is to transmit signals from the brain and spinal cord to the rest of the body making the "or brain" statement synonymous. How do you know that your answer to question 1 is correct?arrow_forward
- Shemia's father had a stroke in his early 50s, which initially impaired his ability to walk and use language. However, after 6 months of physical and language therapy, he is able to do both almost as well as before his stroke. What characteristic of the nervous system explains Shemia's father's ability to recover from his stroke?arrow_forwardComplete transection of the spinal cord produces all of the following effects, except :-a- permanent loss of all sensations mediated by the cord below level of lesionb- permanent loss of voluntary movements by muscles innervated by the cord below level of lesionc- permanent loss of reflexes mediated by the cord below level of lesiond- temporary loss of micturition reflexesarrow_forwardSteven had a stroke resulting in his having difficulty speaking. Ruth suffered a severe nerve injury to her left arm while working, but after a few weeks regained full use of her arm. Why is Steven having difficulty regaining his speaking ability; whereas, Ruth has regained full function in her arm. Base your answer on nervous system regeneration and repair. Please respond with 1-2 paragraphs. (Hint: Section 12.10) Even though both injuries are nervous system injuries. There is a major difference between these two injuries: Central Nervous System versus Peripheral Nervous System!arrow_forward
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