Nero Anatomy Objective Type Questions And Answers

21. Norepinephrine is found in the–
1. sympathetic nervous trunk
2. locus ceruleus
3. lateral tegmentum of the midbrain
4. neuromuscular junction
One or more answers may be correct. Select–
A. if 1, 2, and 3 are correct
B. if 1 and 3 are correct
C. if 2 and 4 are correct
D. if only 4 is correct
E. if all are correct
The answer is A.

22. The lateral column of the spinal cord contains the–
A. lateral corticospinal tract
B. direct corticospinal tract
C. Lissauer's tract
D. gracile tract
The answer is A.

23. Decussations are–
1. aggregates of tracts
2. fiber bundles in a spinal nerve
3. horizontal connections crossing within the CNS from the dominant to nondominant side
4. vertical connections crossing within the CNS from left to right or vice versa
One or more answers may be correct. Select–
A. if 1, 2, and 3 are correct
B. if 1 and 3 are correct
C. if 2 and 4 are correct
D. if only 4 is correct
E. if all are correct
The answer is D.

24. The following fiber systems in the spinal cord are ascending tracts except for the–
A. cuneate tract
B. ventral spinocerebellar tract
C. spinothalamic tract
D. spinoreticular tract
E. reticulospinal tract
The answer is E.

25. The neurotransmitter dopamine–
1. is produced by neurons that project from the substantia nigra to the caudate and putamen
2. mediates transmission at the neuromuscular junction
3. is depleted in Parkinson's disease
4. is the major excitatory transmitter in the CNS
One or more answers may be correct. Select–
A. if 1, 2, and 3 are correct
B. if 1 and 3 are correct
C. if 2 and 4 are correct
D. if only 4 is correct
E. if all are correct
The answer is B.

26. Fine-diameter dorsal root axons of L5 on one side terminate in the–
1. marginal layer of the ipsilateral dorsal horn
2. ipsilateral substantia gelatinosa
3. ipsilateral lamina V of the dorsal horn
4. ipsilateral dorsal nucleus (of Clarke)
One or more answers may be correct. Select–
A. if 1, 2, and 3 are correct
B. if 1 and 3 are correct
C. if 2 and 4 are correct
D. if only 4 is correct
E. if all are correct
The correct answer is B

27. A sign of an upper-motor-neuron lesion in the spinal cord is–
A. severe muscle atrophy
B. hyperactive deep tendon reflexes
C. flaccid paralysis
D. absence of pathologic reflexes
E. absence of withdrawal responses
The correct answer is B

28. Axons in the spinothalamic tracts decussate–
A. in the medullary decussation
B. in the medullary lemniscus
C. within the spinal cord, five to six segments above the level where they enter
D. within the spinal cord, within one to two segments of the level where they enter
E. in the medial lemniscus
The correct answer is D

29. A patient complains of unsteadiness. Examination shows a marked diminution of position sense, vibration sense, and stereognosis of all extremities. He is unable to stand without wavering for more than a few seconds when his eyes are closed. There are no other abnormal findings. The lesion most likely involves the–
A. lateral columns of the spinal cord, bilaterally
B. inferior cerebellar peduncles, bilaterally
C. dorsal columns of the spinal cord, bilaterally
D. spinothalamic tracts, bilaterally
E. corticospinal tracts
The correct answer is C

30. Axons in the spinothalamic tract–
1. carry information about pain and temperature (lateral spinothalamic tract) and light touch (anterior spinothalamic tract)
2. carry information about pain (lateral spinothalamic tract) and temperature (anterior spinothalamic tract)
3. decussate within the spinal cord, within one or two segments of their origin
4. synapse in the gracile and cuneate nuclei
One or more answers may be correct. Select–
A. if 1, 2, and 3 are correct
B. if 1 and 3 are correct
C. if 2 and 4 are correct
D. if only 4 is correct
E. if all are correct
The correct answer is B

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