Human Anatomy & Physiology

Elaine N. Marieb, Katja Hoehn

Chapter 12

The Central Nervous System - all with Video Answers

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Chapter Questions

Problem 1

(Some questions have more than one correct answer. Select the best answer or answers from the choices given.)
The primary motor cortex, Broca's area, and the premotor cortex are located in which lobe? (a) frontal, (b) parietal,
(c) temporal, (d) occipital.

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Problem 2

(Some questions have more than one correct answer. Select the best answer or answers from the choices given.)
The innermost layer of the meninges, delicate and adjacent to the brain tissue, is the (a) dura mater, (b) corpus callosum,
(c) arachnoid mater, (d) pia mater.

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Problem 3

(Some questions have more than one correct answer. Select the best answer or answers from the choices given.)
Cerebrospinal fluid is formed by (a) arachnoid granulations,
(b) dura mater, (c) choroid plexuses, (d) all of these.

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Problem 4

(Some questions have more than one correct answer. Select the best answer or answers from the choices given.)
Choose the correct term from the key to respond to the statements describing various brain areas.
Key:
(a) cerebellum
(b) corpora quadrigemina
(c) corpus callosum
(d) striatum
(e) hypothalamus
(f) medulla
(g) midbrain
(h) pons
(i) thalamus
______ (1) basal nuclei involved in fine control of motor activities
_________ (2) region where there is a crossover of fibers of descending
pyramidal tracts
__________ (3) control of temperature, autonomic nervous system
reflexes, hunger, and water balance
________ (4) houses the substantia nigra and cerebral aqueduct
________ (5) relay stations for visual and auditory stimuli input;
found in midbrain
________ (6) houses vital centers for control of the heart, respiration,
and blood pressure
_______ (7) brain area through which all the sensory input is
relayed to get to the cerebral cortex
______(8) brain area most concerned with equilibrium, body
posture, and coordination of motor activity

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Problem 5

(Some questions have more than one correct answer. Select the best answer or answers from the choices given.)
Destruction of the ventral horn cells of the spinal cord results in loss of (a) integrating impulses, (b) sensory impulses,
(c) voluntary motor impulses, (d) all of these.

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Problem 6

(Some questions have more than one correct answer. Select the best answer or answers from the choices given.)
Fiber tracts that allow neurons within the same cerebral hemisphere to communicate are (a) association fibers,
(b) commissures, (c) projection fibers.

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Problem 7

(Some questions have more than one correct answer. Select the best answer or answers from the choices given.)
A professor unexpectedly blew a loud horn in his anatomy and physiology class. The students looked up, startled. The reflexive movements of their eyes were mediated by the (a) cerebral cortex, (b) inferior olives, (c) raphe nuclei, (d) superior colliculi,
(e) nucleus gracilis.

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Problem 8

(Some questions have more than one correct answer. Select the best answer or answers from the choices given.)
(a) What is the function of the basal nuclei? (b) Which basal nuclei form the striatum? (c) Which arches over the diencephalon?

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Problem 9

(Some questions have more than one correct answer. Select the best answer or answers from the choices given.)
(a) Localize the reticular formation in the brain. (b) What does RAS mean, and what is its function?

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Problem 10

(Some questions have more than one correct answer. Select the best answer or answers from the choices given.)
List four ways in which the CNS is protected.

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Problem 11

(Some questions have more than one correct answer. Select the best answer or answers from the choices given.)
What constitutes the blood brain barrier?

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Problem 12

A patient has suffered a cerebral hemorrhage that has caused dysfunction of the precentral gyrus of his right cerebral cortex. As a result, (a) he cannot voluntarily move his left arm or leg.
(b) he feels no sensation on the left side of his body, (c) he feels no sensation on his right side.

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Problem 13

A number of brain structures are listed below. If an area is primarily gray matter, write a in the answer blank; if mostly white matter, respond with b.
______ (1) cerebral cortex
______ (2) corpus callosum and corona radiata
______ (3) red nucleus
______ ( 4) medial and lateral nuclear groups
_______ (5) medial lemniscus
_______ (6) cranial nerve nuclei
_______ (7) spinothalainic tract
_____ (8) fornix
______ (9) cingulate and precentral gyri

Jorge Villanueva

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Problem 14

All of the following descriptions refer to dorsal column-medial lemniscal ascending pathways except one: (a) they include the fasciculus gracilis and fasciculus cuneatus; (b) they include a chain of three neurons; (c) their connections are diffuse and poorly localized; (d) they are concerned with precise transmission of one or a few related types of sensory input.

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Problem 15

(a) What is the advantage of having a cerebrum that is highly convoluted? (b) What term is used to indicate its grooves? Its outward folds? (c) Which groove divides the cerebrum into two hemispheres? (d) What divides the parietal from the frontal lobe? The parietal from the temporal lobe?

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Problem 16

(a) Make a rough drawing of the lateral aspect of the left cerebral hemisphere. (b) You may be thinking, "But I just can't draw!" So, name the hemisphere involved with most people's ability to draw. (c) On your drawing, locate the following areas and provide the major function of each: primary motor cortex, premotor cortex, somatosensory association cortex, primary somatosensory cortex, visual and auditory areas, prefrontal cortex, Wernicke's and Broca's areas.

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Problem 17

Explain how the cerebellum is physically connected to the brain stem.

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Problem 18

Describe the stages of sleep and outline the order in which we progress through these stages during a typical night's sleep.

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Problem 19

(a) How is cerebrospinal fluid formed and drained? Describe its pathway within and around the brain. (b) What happens if CSF does not drain properly? Why is this consequence more harmful in adults?

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Problem 20

Describe the functional problems that would be experienced by a person in which these fiber tracts have been cut: (a) lateral spinothalamic, (b) ventral and dorsal spinocerebellar,
(c) tectospinal.

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Problem 21

(a) What factors account for brain growth after birth? (b) List some structural brain changes observed with aging.

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Problem 22

Mrs. Jones has had a progressive decline in her mental capabilities in the last five or six years. At first her family attributed her occasional memory lapses, confusion, and agitation to grief over her husband's death six years earlier. When examined, Mrs. Jones was aware of her cognitive problems and was shown to have an IQ score approximately 30 points less than would be predicted by her work history. A CT scan showed diffuse cerebral atrophy. The physician prescribed an acetylcholinesterase inhibitor and Mrs. Jones showed slight improvement. What is Mrs. Jones's problem? Why did the acetylcholinesterase inhibitor help?

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Problem 23

Robert, a brilliant computer analyst, suffered a blow to his anterior skull from a falling rock while mountain climbing. Shortly thereafter, it was obvious to his coworkers that his behavior had undergone a dramatic change. Although previously a smart dresser, he was now unkempt. One morning, he was observed defecating into the wastebasket. Which region of Robert's brain was affected by the cranial blow?

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Problem 24

(a) What does lateralization of cortical functioning mean?
(b) Why is the term cerebral dominance a misnomer?

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Problem 25

Describe the role of the cerebellum in maintaining smooth, coordinated skeletal muscle activity.

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Problem 26

(a) Where is the limbic system located? (b) Which structures make up this system? (c) How is the limbic system important in behavior?

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Problem 27

Compare and contrast short-term memory (STM) and longterm memory (LTM) relative to storage capacity and duration of the memory.

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Problem 28

Describe the spinal cord, depicting its extent, its composition of gray and white matter, and its spinal roots.

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Problem 29

(a) Define cerebrovascular accident or CVA. (b) Describe its possible causes and consequences.

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Problem 30

A 10 -month-old infant has an enlarging head circumference and delayed overall development. She has a bulging anterior fontanelle and her CSF pressure is elevated. Based on these findings, answer the following questions: (a) What are the possible cause(s) of an enlarged head? (b) Which tests might be helpful in obtaining information about this infant's problem?
(c) Assuming the tests conducted showed the cerebral aqueduct to be constricted, which ventricles or CSF-containing areas would you expect to be enlarged? Which would likely not be visible? Respond to the same questions based on a finding of obstructed arachnoid granulations.

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Problem 31

Tara, a 16 -year-old girl, was rushed to the hospital after taking a bad spill off the parallel bars. After she had a complete neurological workup, her family was told that she would be permanently paralyzed from the waist down. During rehabilitation, her neurologist outlined for Tara and her parents the importance of preventing complications in such cases. Common complications include urinary infection, bed sores, and muscular spasms. Using your knowledge of neuroanatomy, explain the underlying reasons for these complications.

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