Fall 09 - Gray matter refers to regions of the central...

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Gray matter refers to regions of the central nervous system composed of bundles of myelinated neuronal fibers, whereas white matter consists primarily of densely packed cell bodies. a) True b) False Question 2 Your answer is CORRECT. The arachnoid mater is a) the innermost meningeal layer b) a delicate, richly vascularized meningeal layer that is cobwebby in appearance c) a tough, non-elastic membrane that covers the central nervous system d) involved with the formation of CSF e) the innermost meningeal layer which has a delicate, richly vascularized cobwebby appearance Question 3 Your answer is CORRECT. Which of the following statements concerning cerebrospinal fluid is incorrect? Cerebrospinal fluid: a) is formed by the choroid plexuses and is reabsorbed across the arachnoid villi into the blood within the dural sinuses. b) serves as a shock-absorbing fluid to cushion the brain against jarring movements. c) comes into direct contact with the neuronal and glial cells. d) fills the subarachnoid space. e) influences the composition of the brain interstitial fluid more than the blood does. Question 4 Your answer is CORRECT. Transport across the brain capillary walls is anatomically prevented between the cells and is physiologically restricted through the cells. a) True b) False Question 5 Your answer is CORRECT. Information travels up the spinal cord to the brain via: a) afferent pathways. b) efferent pathways. c) ascending tracts. d) descending tracts. e) the dorsal root ganglion. Question 6 Your answer is CORRECT. Which of the following statements concerning the spinal cord is incorrect? a) afferent fibers enter the spinal cord through the ventral root. b) the dorsal and ventral roots at each level of the spinal cord join to form a spinal nerve. c) the spinal cord is not as long as the vertebral column.
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d) the ventral horn contains cell bodies of the efferent motor neurons that supply skeletal muscles. e) the white matter of the spinal cord is organized into ascending and descending tracts. Question 7 Your answer is CORRECT. Most of the cranial nerves originate from the: a) brain stem. b) cerebellum. c) cerebral cortex. d) hypothalamus. e) thalamus. Question 8 Your answer is INCORRECT. The cerebellum: a) is concerned primarily with motor activity yet does not have any direct influence on efferent motor neurons. b) is part of the subcortical region of the brain. c) when diseased gives rise to resting tremors. d) contains the reticular activating system. e) is associated with declarative memories. Question 9 Your answer is CORRECT. The hypothalamus: a) performs preliminary processing of all sensory input on its way to the cortex. b) inhibits muscle tone throughout the body. c)
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Fall 09 - Gray matter refers to regions of the central...

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