Formation of the major organ systems

Question 1

What does the surface ectoderm form?

Answer 1

• epidermis
• hair and nails
• olfactroy and mouth epithelia
• lens and cornea

Question 2

What does the neural tube form?

Answer 2

• brain
• spinal cord
• motor neurones
• retina

Question 3

What does the neural crest form?

Answer 3

• PNS
• adrenal medulla
• melanocytes
• facila cartilage
• dentine

Question 4

How is the neural tube made?

Answer 4

1. the neural plate is folded at the medial hinge point so the notochord is in the centre
2. the sides fold over and fuse in the middle

Question 5

What are two neural tube closure defects?

Answer 5

• anencephaly (small head)

- spina bifida (lump on spine)

Question 6

What is linked to neural tube birth defects?

Answer 6

folate in vitamin 9

Question 7

What is the recommended dosage of folate and when should it be taken?

Answer 7

`When you are trying to become pregnant and in the first 12 weeks of pregnancy 400ug of folate daily

Question 8

cells close to the midline of the mesoderm proliferate to form a thickened plate what is this plate called?

Answer 8

paraxial mesoderm