Embryology

Question 1

3 Categories of ectoderm

Answer 1

Surface, neural tube, neural crest

Question 2

Surface ectoderm

Answer 2

Anterior pit, lens, cornea, inner ear sensory organs, olfactory epithelium, Nasal and oral epithelium, salivary glands, epidermis, sweat glands, mammary glands

Question 3

Neural tube

Answer 3

Brain and spinal cord, posterior pit, pineal gland, retina

Question 4

Neural crest

Answer 4

Neural ganglia, adrenal medulla, schwann cells, pia and arachnoid mater, endocardial cushions, branchial arches, skull bones, melanocytes

Question 5

Mesoderm

Answer 5

Muscles, connective tissue, bone, serosa, cardiovascular and lymphatics, spleen and hemopoietic cells, kidney and ureters, Adrenal cortex

Question 6

Endoderm

Answer 6

GI, liver, pancreas, lungs, thymus, parathyroids, thyroid follicular cells, middle ear epithelium, bladder and urethra, parafollicular cells

Question 7

Cause of ToF

Answer 7

Deviation of the infundibular septum

Question 8

Cause of transposition of the great vessels

Answer 8

linear rather than spiral development of the aorticopulmonary septum

Question 9

Annular Pancreas

Answer 9

Failure of ventral pancreatic bud to rotate and join the dorsal pancreatic bud