Ch. 11 Book Questions Flashcards Preview

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Flashcards in Ch. 11 Book Questions Deck (10)
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1

What molecule produced by the notochord is instrumental in inducing the floor plate of the neural tube?
a. Hoxa-5
b. Retinoic acid
c. Pax-3
d. Msx-1
e. Shh

e. Shh

2

The cell bodies of the motor neurons of a spinal nerve arise from the:
a. Basal plate
b. Marginal zone
c. Floor plate
d. Roof plate
e. Alar plate

a. Basal plate

3

An infant with a tuft of hair over the lumbar region of the vertebral column undergoes surgery for a congenital anomaly in that region. During surgery, it was found that the dura and arachnoid layers over the spinal cord were complete, but that the neural arches of several vertebrae were missing. What condition did the infant have?
a. Meningocele
b. Meningomyelocele
c. Encephalocele
d. Spina bifida occulta
e. Rachischisis

d. Spina bifida occulta

4

Growth cones adhere strongly to a substrate containing:
a. Acetylcholine
b. Laminin
c. Epinephrine
d. Norepinephrine
e. Sonic hedgehog

b. Laminin

5

Complete failure of the neural tube to close in the region of the spinal cord is:
a. Spina bifida occulta
b. Meningocele
c. Cranioschisis
d. Rachischisis
e. Myelomeningocele

d. Rachischisis

6

Rhombomeres are segmental divisions of the:
a. Forebrain
b. Midbrain
c. Hindbrain
d. Spinal cord
e. None of the above

c. Hindbrain

7

Pregnant women typically first become aware of fetal movements during what month of pregnancy?
a. Second
b. Third
c. Fourth
d. Sixth
e. Eighth

c. Fourth

8

Rathke’s pouch arises from the:
a. Diencephalon
b. Stomodeal ectoderm
c. Mesencephalon
d. Pharyngeal endoderm
e. Infundibulum

b. Stomodeal ectoderm

9

In the early days after birth, an infant does not pass fecal material and develops abdominal swelling. An anal opening is present. What is the probable condition?

Congenital megacolon (Hirschsprung’s disease), in which a segment of large intestine develops without parasympathetic ganglia. Intestinal contents cannot actively move through such an aganglionic segment.

10

What is the likely appearance of the spinal cord and brachial nerves in an infant who was born with the congenital absence of one arm (amelia)?

The nerves would be hypoplastic (much smaller than normal), and the spinal cord would be thinner than normal in the area from which the nerves supplying the affected limb arise. The likely cause is excessive neuronal cell death because of the absence of an end organ for many of the axons that normally supply the limb.