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Flashcards in TRACT SPINAL CORD Deck (10)
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1. The ability to recognize an unseen familiar object placed in the hand depends on the integrity of which pathway?
(A). Spinospinal tract
(B). Dorsal column
(C). Dorsal spinocerebellar tract
(D). Spino-olivary tract
(E). Spinothalamic tract

1.-B. The ability to recognize the form and texture of an unseen familiar object is called stereognosis. This is an important function of the dorsal column-medial lemniscus system.

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2. All of the following statements concerning the corticospinal tracts are correct EXCEPT
(A). They arise from lamina V of the cerebral cortex
(B). They arise from upper motor neurons (UMNs)
(C). They descend through the anterior limb of the internal capsule
(D). They undergo a 90% decussation in the caudal medulla
(E). They descend through the base of the pons

2.-C. The corticospinal tracts arise from upper motor neurons (UMNs) found in lamina V of the cerebral cortex. They descend through the posterior limb of the internal capsule, the middle third of the crus cerebri (basis pedunculi) of the midbrain, and the base of the pons and constitute the medullary pyramids. Ninety percent of the corticospinal fibers decusate in the caudal medulla as the pyramidal decussation

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3. Destruction of the ventral horn results in all of the following deficits EXCEPT
(A). Loss of muscle stretch reflexes (MSRs)
(B). Loss of muscle bulk
(C). Flaccid paralysis
(D). Babinsky sign
(E). Loss of superficial abdominal reflexes

3.-D. Destruction of ventral horn motor neurons results in lower motor neurons (LMN) lesion and is characterized by flaccid paralysis, muscle atrophy (loss of muscle bulk), and areflexia (loss of muscle stretch and superficial abdominal reflexes). The babinski sign is not seen in LMN disease.

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4. All of the following tracts decussate in the ventral white commisure EXCEPT the
(A). Lateral spinothalamic tract
(B). Ventral spinocerebellar tract
(C). Ventral corticospinal tract
(D). Dorsal spinocerebellar tract
(E). Ventral spinothalamic tract

4.-D. The dorsal spinocerebellar tract is an uncrossed tract

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5.The corticospinal tracts receive contributions from all of the following areas EXCEPT
The
(A). Prefrontal cortex
(B). Premotor cortex
(C). Motor cortex
(D). Somatesthetic cortex
(E). Paracentral lobule

5.-A. The corticospinal (pyramidal)tracts receive contributions from the premotor (area 6), motor (area 4), and the sensory or somatesthetic (area 3, 1 and 2) cortices. They receive approximately one third of their axons from each of these cortical areas. The paracentral lobule represents a continuation of the motor and somatesthetic cortices into the medial aspect of the hemisphere. The prefrontal cortex lies rostral to the premotor cortex.

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(A). Cuneocerebellar tract
(B). Cuneate fasciculus
(C). Dorsal spinocerebellar tract
(D). Lateral corticospinal tract
(E). Lateral spinothalamic tract
(F). Lissauer tract
(G). Vestibulospinal tract

6. Contains axons from the giant cells of deiters

6.-G. The vestibulospinal tract arises from the giant cells of deiters found in the ipsilateral lateral vestibular nucleus of the pons. The vestibulospinal tract facilitates extensor muscle tone.

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(A). Cuneocerebellar tract
(B). Cuneate fasciculus
(C). Dorsal spinocerebellar tract
(D). Lateral corticospinal tract
(E). Lateral spinothalamic tract
(F). Lissauer tract
(G). Vestibulospinal tract


7. Is the upper extremity equivalent of a tract that arises from the cells of Clarke
Column

7.-A. The cuneocerebellar tract is the upper extremity equivalent of the dorsal spinocerebellar tract, which arises from the cells of the clarke column. The cuneocerebellar tract arises from cells of the accesory cuneate nucleus, a homolog of the nucleus of Clarke.

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(A). Cuneocerebellar tract
(B). Cuneate fasciculus
(C). Dorsal spinocerebellar tract
(D). Lateral corticospinal tract
(E). Lateral spinothalamic tract
(F). Lissauer tract
(G). Vestibulospinal tract

8. Conveys nociceptive input from the contralateral side of the body

8.-E. The lateral spinothalamic tract conveys nociceptive input from the contralateral side of the body.

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(A). Cuneocerebellar tract
(B). Cuneate fasciculus
(C). Dorsal spinocerebellar tract
(D). Lateral corticospinal tract
(E). Lateral spinothalamic tract
(F). Lissauer tract
(G). Vestibulospinal tract

9. Contains axons from the giant cells of Betz

9.-D. The lateral corticospinal tract contains axons from the giant cells of Betz. The giant pyramidal cells of Betz are found in the precentral gyrus and in the anterior paracentral lobule.

10

(A). Cuneocerebellar tract
(B). Cuneate fasciculus
(C). Dorsal spinocerebellar tract
(D). Lateral corticospinal tract
(E). Lateral spinothalamic tract
(F). Lissauer tract
(G). Vestibulospinal tract


10.Contains ipsilateral pain fibers that have their second-order neurons in the dorsal
horn.

10.-F. The dorsolateral tract of Lissauer cantains ipsilateral pain fibers that have their second order neurons in the dorsal horn.