Abdominal Cavity I Flashcards
Ectoderm
make integument and nervous system, lining of anus and mouth
Splanchnic mesoderm
make muscle, bone, connective tissue, outer layers of gut and gut-derived abdominal organs
endoderm
makes lining of gut and gut-derived abdominal organs
yolk sac
protects embryo from EtOH until it’s implanted
gives nourishment until implantation is complete
starts to form endoderm
blood develops here until liver is functional
What forms first: anus or mouth?
anus
Foregut
consists of mouth and anus
gives rise to pharyngeal pouches
blood vessel of the foregut
celiac trunk
midgut
extend from distal 2/3 of duodenum to proximal 2/3 of colon
gives rise to yolk stalk
blood vessel of the midgut
superior mesenteric a (SMA)
hindgut
extends from distal 1/3 of colon to anus
gives rise to allantois
blood vessel of the hindgut
inferior mesenteric a (IMA)
re-canalization allows what?
structures to pass through gut tube
stenosis
narrowing of lumen
arthesia
complete blockage
mesentery
2 thin layers of splanchnic mesoderm that fuse together and form mucous/fibrous sheets around organs
What happens to the dorsal mesentery?
disinigrates
What happens to the ventral mesentery?
forms remnants
Remnants of the ventral mesentery
falicifrom ligament
coronary ligament
lesser omentom
Falciform ligament
goes from liver to ventral body wall
Coronary ligament
goes from liver to diaphragm
Lesser omentom
goes from liver to stomach and duodenum, but doesn’t attach to a body wall
Secondarily Retroperitoneal
early in development is intraperitoneal but during rotation the organ gets pressed against the body wall and one layer of peritoneum disintegrates
Primary retroperitoneal
always behind a mesentary during development
Which organs are secondarily retroperitoneal
adreal glands
pancreus
2nd-4th parts of duodeum
ascending/descending colon
Which organs are primarily retroperitoneal
esophagus
rectum
anus
kidney
Mnemonic for retropertoneal organs
SAD PUCKER
suprarenal glands, aorta/vena cava, duodeum, pancrease ureter, colon, kidney, esophagus, rectum
Tracheosophageal folds
fuse to creat the esophagus and trachea
Fistula
joining of two structures that shouldn’t be joined
Polyhydramnios
excess amniotic fluid
Where does amniotic fluid come from
allantois
What can happen when the fetus swallows amniotic fluid?
esophageal atresia
_____ border of the stomach grows faster than the ____ border
dorsal
lesser
Dorsal border of stomach creates the ____ curvature.
Ventral border of stomach creates the ____ curvature
greater
lesser
What provides parasymphatetic innervation to stomach
vagus
Pancreatic development
starts as 2 buds (dorsal and ventral) that come together to form pancreas
What happens if 2 ventral buds of pancreas develop?
stenosis of duodnum
Spleen development
NOT an endodermal derative
forms from splanchinic mesoderm and dorsal mesentery
What are some problems that can happen during twistin?
untwisted gut volvulus reversed rotation sub-hepatic cecum and appendix internal hernia midgut volvulus
volvulus
torsion or twisting of gut in a different directions
can cause blockage in small intestine
reversed rotation
SMA wraps around transverse colon causing blockage
sub-hepatic cecum and appendix
no ascending colon
internal hernia
omentum gets wrapped around small intestine, causes issues with digestion
midgut volulus
colon wraps around duodeum
Urorectal septum
splits clocacal membrane into urogenital membrane and anal membrane
Pectinate line
where ectoderm and endoderm meet
What receptors are above the pectinate line
pressure/stretch
NO PAIN
What receptors are below the pectinate line
pain
Persistant anal membrane
no opening to deficate
anal-perineal fistula
the feces goes out a different hole
rectouretral fistula
feces goes out of penis
rectovaginal fistula
feces foes out vagina
