Development of the Nervous System

Question 1

Neural crest cells develop into:

Answer 1

cranial nerve sensory ganglion cells and dorsal root ganglion cells

postganglionic autonomic ganglion cells (sym and para)

chromaffin cells of adrenal medulla

melanocytes

schwann cells

Question 2

what does the prosencephalon develop into?

Answer 2

Telencephalon= cerebral cortex, basal ganglion, amygdala, plus the lateral forament of monor

Diencephalon = thalamus, hypothalamus, posterior pituitary, pineal gland and the third ventricle

Question 3

What does the mesencephalon develop into?

Answer 3

Midbrain + cerebral aqueduct

Question 4

What does the rhombencephalon develop into?

Answer 4

Metencephalon = pons and cerebellum + 4th ventricle

Myelencephalon = medulla

Question 5

What does the NS develop from?

Answer 5

Ectoderm, induced by the notochord

Question 6

The notochord is made of..

Answer 6

Mesoderm

Question 7

The sulcus limitans divides what two plates?

Answer 7

Alar plate (sensory pathways)
Basal plate (motor pathways)

Question 8

What is myeloschisis (spina bifida)

Answer 8

When the posteiror neuropore fails to close.

Three types:
spina bifida occulta
spina bifida cystica (meningocele and meningomyelocele)
rachischisis

Question 9

Exencephalay:

Answer 9

failure of the cephalic neural tube to close, result sin failure of the skull to form, leaving the malformed brain exposed

incompatible to life

Question 10

Hydrocephalus:

Answer 10

abnormal accumulation of CSF within the ventricular system, can lead the lateral ventricles pressing outward on the cortex and developing skull; since the cranial nerves have not fused, the skull expands.

Usually blockage/stenosis of aqueduct of Sylvius.