Larsens Human Embryology 5th Edition By Schoenwolf PhD – Test Bank

Larsens Human Embryology 5th Edition By Schoenwolf PhD – Test Bank

Schoenwolf et al.: Larsen’s Human Embryology, 5th Edition

Chapter 9: Development of the Central Nervous System

Test Bank

MULTIPLE CHOICE

1. A researcher interested in patterning of the early neural tube identifies a new secreted factor expressed in the isthmus signaling center. Assuming that the newly identified factor plays a role in patterning, which axis of the developing neural tube would you expect to be perturbed if this factor is inactivated?
A. Cranial-caudal
B. Dorsal-ventral
C. Medial-lateral
D. Right-left

ANS: A

2. A researcher interested in patterning of the early neural tube identifies a new secreted factor expressed in the floor plate. Assuming that the newly identified factor plays a role in patterning, which axis of the developing neural tube would you expect to be perturbed if this factor is inactivated?
A. Cranial-caudal
B. Dorsal-ventral
C. Medial-lateral
D. Right-left

ANS: B

3. A researcher treats an early neural-tube-stage embryo with a 1-hour pulse of colchicine, which arrests proliferating cells in metaphase. Where will the arrested cells be found?
A. Throughout the marginal layer of the neural tube
B. Throughout the mantle layer of the neural tube
C. Throughout the ventricular layer of the neural tube
D. Only in the floor plate of the neural tube
E. Only in the roof plate of the neural tube

ANS: C

4. A surgeon operates on the lumbar nervous system to relieve intractable pain in a terminal cancer patient. What specific part of the nervous system would be cut?
A. Visceral root
B. Dorsal root
C. Ventral root
D. Spinal nerve
E. Basal plate of the spinal cord

ANS: B

5. A 45-year-old man develops Bell’s palsy in which function of the facial (VII) cranial nerve is compromised. What specific level of the central nervous system does the facial nerve connect to?
A. Telencephalon
B. Diencephalon
C. Mesencephalon
D. Metencephalon
E. Myelencephalon
F. Spinal cord

ANS: D

6. A 20-year-old woman suffers a stroke after a drug overdose that causes localized damage to the brain stem special somatic afferent column on one side. Sensation from which structure(s) will be compromised?
A. Skin
B. Taste buds
C. Nonstriated muscle
D. Inner ear
E. Somatic striated muscle

ANS: D

7. A 3-year-old boy with spina bifida develops hydrocephalus. What is the likely cause of this?
A. Blockage of the subarachnoid space
B. Enlargement of the choroid plexus
C. Constriction of the foramen magnum
D. Blockage of the median or lateral apertures
E. Degeneration of the choroid plexus

ANS: D