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Medicine Unit 7 > Key concepts: Endoderm > Flashcards

Key concepts: Endoderm Flashcards

1
Q

formation of the endoderm

A

developed in gastrulation
bottom layer of the trilaminar disc
lateral folding in the longitudinal axis forms the gut tube
cranial caudal folding shows the entire gut tube in the sagittal section

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2
Q

3 components of the endoderm

A

forms the epithelial lining of:
foregut
midgut
hindgut

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3
Q

foregut

A

pharynx
oesophagus
first half of duodenum

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4
Q

midgut

A

second half of duodenum
jejunum
ileum
caecum
ascending colon
proximal 2/3 transverse

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5
Q

hindgut

A

distal 1/3 transverse
descending colon
sigmoid colon
rectum and anal canal

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6
Q

buccopharyngeal membrane

A

fusion of the ectoderm and the endoderm

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7
Q

primitive pharynx, composition

A

ectoderm outside and endoderm inside lining
mesoderm between the two
buccopharyngeal membrane at the top

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8
Q

primitive pharynx

A

have pharyngeal apparatus, lined with endoderm
form pharyngeal pouches: 1st, 2nd, 3rd and 4th

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9
Q

pharyngeal apparatus

A

vesticulations

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10
Q

1st pouch

A

middle ear
auditory tube

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11
Q

2nd pouch

A

tubal tonsils
pharyngeal tonsils
lingual tonsils
palatine tonsils

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12
Q

3rd and 4th pouch

A

superior parathyroid gland
inferior parathyroid gland
C cells

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13
Q

budding organs from the forgegut

A

respiratory bud
hepatic bud
pancreatic bud

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14
Q

respiratory bud

A

respiratory tract

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15
Q

hepatic bud

A

liver and gall blader

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16
Q

pancreatic bud

A

pancreas

17
Q

what does the buccopharyngeal membrane form

A

the mouth

18
Q

what does the cloacal membrane form

A

urethra and anal canal
drain and stain

19
Q

cloaca bifurcates into

A

anterior and posterior

20
Q

cloacal anterior

A

urogenital sinus:
bladder
urethra
prostate gland

21
Q

cloacal posterior

A

anal canal
ectoderm moves in and separates at the pectinate line
superior 2/3 is endoderm
inferior is ectoderm

22
Q

how to remember endoderm structures

A

ENDO

23
Q

structures formed by endoderm

A

Epithelial lining of GIT
Neck: thyroid, thymus and PTH
Drainer: bladder and urethra
Organs associated with GIT

Medicine Unit 7 (26 decks)

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