Pharyngeal Arches And Pouches

Question 1

What is gastrulation?

Answer 1

Formation of the blastocyst plate, endoderm mesoderm ectoderm

Question 2

What structures are derived from the endoderm?

Answer 2

GI tract, liver, pancreas, biliary tree, lungs

Question 3

Which structures are derived from the mesoderm?

Answer 3

Cardiovascular system, blood vessels, heart, urinary tract, bone, muscle, subcutaneous tissue, ovaries and testes, kidneys

Question 4

What structures are derived from the ectoderm?

Answer 4

Skin, CNS, PNS, sweat and mammary glands, hair

Question 5

Which of the aortic arches regress?

Answer 5

1,2 and 5

Question 6

What do the aortic arches become?

Answer 6

1 and 2 go away, 3 becomes ICA and CCA. 4 becomes right subclavian and aortic arch. 5 regresses. 6 = ductus arterioles and pulmonary trunk. 7 = left subclavian artery.

Question 7

What do the 4 pharyngeal pouches turn into ?

Answer 7

1 - middle ear. 2 - palatine tonsils. 3 - inferior parathyroid glands. 4 - superior parathyroid glands and parafollicular C cells (calcitonin)