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USMLE > Embryologic derivatives > Flashcards

Embryologic derivatives Flashcards

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USMLE® Step 1 flashcards
1
Q

Epidermis

A

Surface ectoderm

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2
Q

Adenohypophysis (from Rathke pouch)

A

Surface ectoderm

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3
Q

Lens of eye

A

Surface ectoderm

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4
Q

Epithelial linings of oral cavity

A

Surface ectoderm

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5
Q

Sensory organs of ear

A

Surface ectoderm

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6
Q

Olfactory epithelium

A

Surface ectoderm

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7
Q

Anal canal below pectinate line

A

Surface ectoderm

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8
Q

Parotid, sweat, mammary glands

A

Surface ectoderm

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9
Q

Brain (neurohypophysis, CNS neurons, oligodendrocytes, astrocytes, ependymal cells, pineal gland)

A

Neuroectoderm

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10
Q

Retina

A

Neuroectoderm

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11
Q

Spinal cord

A

Neuroectoderm

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12
Q

What embryologic layer is the neural crest part of?

A

Neural crest

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13
Q

PNS (dorsal root ganglia, cranial nerves, autonomic ganglia, Schwann cells)

A

Neural crest

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14
Q

Melanocytes

A

Neural crest

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15
Q

Chromaffin cells of adrenal medulla

A

Neural crest

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16
Q

Parafollicular (C) cells of thyroid

A

Neural crest

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17
Q

Pia and arachnoid

A

Neural crest

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18
Q

Bones of the skull

A

Neural crest

19
Q

Odontoblasts

A

Neural crest

20
Q

Aorticopulmonary septum

A

Neural crest

21
Q

Endocardial cushions

A

Neural crest

22
Q

Neural crest derivatives pneumonic

A 
MAGIC COPS 
Melanocytes
Aorticopulmonary septum
Ganglia (Enteric, dorsal root, autonomic)
Iris
Chromaffin cells
Cranial nerves 
Odontoblasts/ossicles
Parafollicular cells
Sclerae
23
Q

Muscle

A

Mesoderm

24
Q

Bone

A

Mesoderm

25
Q

Connective tissue

A

Mesoderm

26
Q

Serous linings of body cavities (Peritoneum)

A

Mesoderm

27
Q

Spleen

A

Mesoderm

28
Q

What is the spleen derived from?

A

Foregut mesentary

29
Q

Cardiovascular structures

A

Mesoderm

30
Q

Lymphatics

A

Mesoderm

31
Q

Blood

A

Mesoderm

32
Q

Wall of gut tube

A

Mesoderm

33
Q

Upper vagina

A

Mesoderm

34
Q

Kidneys

A

Mesoderm

35
Q

Adrenal cortex

A

Mesoderm

36
Q

Dermis

A

Mesoderm

37
Q

Testes

A

Mesoderm

38
Q

Ovaries

A

Mesoderm

39
Q

What induces the ectoderm to form the neuroectoderm?

A

Notochord

40
Q

What is the postnatal derivative of the notochord?

A

Nucleus pulposus

41
Q

Gut tube epithelium (including anal canal above the pectinate line)

A

Endoderm

42
Q

Most of urethra and lower vagina (derived from urogenital sinus)

A

Endoderm

43
Q

Luminal epithelial derivatives (eg lungs, liver, gallbladder, pancreas, eustachian tube, thymus, parathyroid, thyroid follicular cells)

A

Endoderm

USMLE (15 decks)

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