Ectoderm/ Nervous System Flashcards

1
Q

What name is used to describe the lateral edges of the neural plate?

A

Neural folds

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2
Q

On what day of human development does the cranial neuropore close?

A

24 days

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3
Q

In the developing neural tube what name is given to an immature neuron?

A

Neuroblast (or primitive nerve cell)

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4
Q

In the developing neural tube where would you find neuronal progenitors?

A

Ventricular Zone

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5
Q

In the developing neural tube where would you find radial glial cells?

A

Ventricular Zone

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6
Q

Neurogenic phase progenitor cells divide asymmetrically. What do they form?

A

One dividing cell and one immature neuron or glia

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7
Q

Late phase progenitor cells divide assymetrically. What do they form?

A

One immature neuron and one immature glia.

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8
Q

Which cells wrap axons of the central nervous system in a myelin sheath?

A

Oligodendrocytes

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9
Q

What is the main function of the myelin sheath that surrounds many axons?

A

To increase the conduction velocity of axons.

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10
Q

In developing spinal cord, what neurons are formed by the alar plates?

A

Sensory Interneurons

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11
Q

In the spinal cord, where would you find the nuclei of sensory neurons?

A

Dorsal Root Ganglia

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12
Q

Which of these animals does not possess a neural crest during embryogenesis?

Select one:

Amphioxus lanceolatum (Lancelot)

Xenopus laevis (frog)

Danio rerio (zebrafish)

Gallus gallus (chicken)

Mus musculus (mouse)

A

Amphioxus lanceolatum (Lancelot)

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13
Q

What hormone is secreted by Chromaffin cells?

A

Adrenalin

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14
Q

Which part of the neural tube do most enteric neurons derive?

A

Rhombencephalon

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15
Q

Which of the three CNS meningeal layers are formed by the neural crest?

A

Arachnoid, Pia Mater

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16
Q

What do Rhombencephalic neural crest cells form in the pharyngeal arches?

A

Cartilage, Mesenchyme

17
Q

Which gut congenital malformation is a defect of neural crest migration?

A

Hirschsprung’s disease