Wk3 Endo Flashcards Preview

Embriology glossary > Wk3 Endo > Flashcards

Flashcards in Wk3 Endo Deck (31)
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1
Q
A
2
Q

Term

A

Definition

3
Q

primitive gut

A

The largely undifferentiated embryonic gastrointestinal tract

4
Q

diverticulum

A

A pouch from a tube, as in the pouches on the primitive gut which become endodermal organs

5
Q

head fold

A

The fold which takes the future heart and head ventrad after the gastrula stage

6
Q

tail fold

A

The fold opposite the head fold

7
Q

lateral folds

A

The folds on the left and right side of the embryo forming at the same time as head and tail folds

8
Q

foregut

A

The gut and its derivatives from the mouth to mid-duodenum. Blood supplied by celiac artery

9
Q

midgut

A

The gut from the inferior duodenum to first two-thirds of the transverse colon. Blood supplied by superior mesenteric artery

10
Q

hindgut

A

The gut from the last third of the transverse colon to the anus. Blood supplied by inferior mesenteric artery.

11
Q

oropharyngeal membrane

A

The membrane that initially seals the anterior end of the gut tube shut at the mouth

12
Q

cloacal membrane

A

The membrane that initially seals the posterior end of the gut tube shut at the cloaca

13
Q

lateral plate mesoderm

A

The most lateral embryonic mesoderm, consisting of a dorsal leaflet of somatic mesoderm separated by the coelom from the more ventral splanchnic mesoderm

14
Q

splanchnic mesoderm

A

The ventral leaflet of lateral plate mesoderm which gives rise to the dorsal mesentery and the connective tissue and smooth muscle associated with the gut. Also gives rise to the heart and blood vessels

15
Q

somatic mesoderm

A

The dorsal leaflet of lateral plate mesoderm which gives rise to the body wall, the sternum and ventral dermis. Also gives rise to the pericardium.

16
Q

coelom

A

The embryonic cavity in the lateral plate mesoderm which gives rise to the pericardial, pleural and peritoneal cavities.

17
Q

mesentery

A

Connective tissue which suspends the primitive gut from the body wall in the body cavity.

18
Q

neural crest

A

A highly migratory cell type deriving from the neural folds and generating a diverse array of cell types throughout the body, including the enteric nervous system.

19
Q

enteric nervous system

A

The nervous system consisting of neurons with their cell bodies in the gut. Derived from the neural crest, it controls peristalsis.

20
Q

pharynx

A

The early, undivided future trachea and esophagus

21
Q

alpha-fetoprotein

A

A serum albumin-like protein made by the yolk sac and fetal liver.

22
Q

peritoneum

A

The visceral cavity inferior to the diaphragm

23
Q

retroperitoneal

A

Lying dorsal to the dorsal wall of the peritoneum.

24
Q

allantois

A

A diverticulum of the primitive gut which becomes incorporated into the umbilicus. In the embryos of birds and reptiles, it stores nitrogenous waste.

25
Q

umbilicus

A

The connection between the fetus and the placenta, covered by a derivative of the amnion, incorporating the yolk sac, allantois and connecting stalk. The umbilical arteries and vein run through it.

26
Q

urorectal septum

A

The septum which divides the cloaca into the urogenital sinus and rectum and divides the cloacal membrane into the urogenital membrane and anal membrane generating the perineum.

27
Q

urogenital sinus

A

After division of the cloaca, the urogenital cavity, later contributing to bladder and urethra

28
Q

cloaca

A

The transient common vestibule for products of the kidneys, gut and gonads. An adult structure in birds and reptiles.

29
Q

stenosis

A

Abnormal narrowing of a channel.

30
Q

atresia

A

Absence through degeneration.

31
Q

fistula

A

An abnormal passage or channel.