IV: Abdominal Cavity II- Overview and supporting systems Flashcards
which end of the esophagus is voluntary muscle? involuntary?
pharyngeal proximal end –> voluntary
gastric end –> smooth involuntary
what is the length of the small intestine? large?
20-23 ft small
5 ft large
3 parts of sm. intestine in order proximal to distal
duodenum
jejunum
ileum
5 parts of the duodenum and their classification
1st superior- intraperitoneal
2nd descending- secondarily retroperitoneal
3rd horizontal- secondarily retroperitoneal
4th ascending- secondarily retroperitoneal
5th terminal slip- intraperitoneal
where to the ducts carry excretions from liver gall bladder and pancreas enter the intestinal system
duodenum
which is longer jejunum or ileum
ileum
jejunum classification
intraperitoneal
ileum classification
intraperitoneal
what 3 characteristics distinguish the lg. intestine from the sm. intestine?
- taenia coli
- haustra
- epiploic appendages
cecum classification
intraperitoneal
ascending colon classification
secondarily retroperitoneal
what forms right paracolic gutter
ascending colon
which intestine fuses with greater omentum?
transverse colon
where is the division between embryonic hindgut and midgut?
left colic flexure
proximal: midgut
distal: hindgut
descending colon classification
secondarily retroperitoneal
sigmoid colon classification
intraperitoneal
where does the taenia coli end?
rectosigmoid junction
rectum and anus classification
primarily retroperitoneal
3 branches off of celiac trunk
- common hepatic
- splenic
- left gastric
left gastric —>
lesser curvature of the stomach
3 branches off splenic a.
- pancreatic aa
- short gastric aa
- left. gastroomental/gastroepiploic
l. gatroepiploic —>
left side of the greater curvature of the stomach
3 main branches off of common hepatic a.
- gastroduodenal a.
- r. gastric a.
- proper hepatic a.
3 main branches off of gastroduodenal a.
- r. gastroepiploic/gastroduodenal
- superior pancreaticoduodenal a.
- supraduodenal a.
r. gastroduodenal –>
right side of the greater curvature of the stomach
superior pancreaticoduodenal a. —>
stomach, pancreas and the head of the duodenum
supraduodenal a. —>
superior duodenum, sometimes absent
r. gastric artery –>
right lesser curvature of the stomach
2 branches off of proper hepatic a.
- right hepatic a.
- left hepatic artery
both to the liver
what does the cystic artery branch off of?
right hepatic a.
6! branches of the superior mesenteric a. in the midgut
- inferior pancreaticoduodenal a.
- intestinal branches
- ileocolic a.
- r. colic a.
- middle colic a.
- marginal a.
inferior pancreatico duodenal a. –>
head of pancreas and duodenum
intestinal branches –>
jejunum and ileum
ileocolic a. –>
distal ileum and cecum
r. colic a –>
ascending colon
middle colic a. –>
transverse colon
marginal a –>
ANASTOMOSING CIRCLE around the COLON
what gives rise to vasae rectae?
marginal a.
what connects the SMA and IMA? (besides aorta)
marginal a.
which branches of a. contribute to the marginal circle a.
ileocolic
r. colic
middle colic
l. colic (**from IMA)
what are the three branches off of IMA?
- l. colic
- sigmoid a.
- superior rectal a.
l. colic –>
descending colon
sigmoid a. –>
sigmoid colon
superior rectal aa –>
proximal rectum
anastomose between superior pancreaticoduodenal a. and inferior pancreaticoduodenal a. connect which two structures?
celiac trunk (sup) and superior mesenteric a. (inf)
what do the jejunal a. anastome with?
inferior pancreaticoduodenal a.
what does the anastomosis of superior rectal a., middle rectal a. and inferior rectal a. connect?
IMA (sup.), internal iliac (middle) and internal pudendal (inf)
blood from abdomen eventually returns to heart via IVC, but first it passes through
hepatic portal system
pathway of venous return to hepatic portal system
inferior messenteric vein –> splenic vein
superior mesenteric vein + splenic vein = hepatic portal v.
what is caput medusa? “snakes under skin”
non-functional umbilical veins fill with blood via umbilical anastomosis necessary due to liver enlargement
what do parasympathetics generally do in the abdomen
promote peristalsis and secretions
plexus of the foregut
celiac plexus T5-9
plexus of the midgut
superior messenteric plexus T10-12
plexus of hindgut
inferior messenteric plexus and hypogastric plexus (L1-2)(S2-4)
sympathetics of foregut
T5-9 pass through greater splachnic n. and synapse in celliac ganglia
postsynaptics follow a. to target organ
parasympathetic of foregut
pass through vagus, celiac plexus, synapse in ganglia in the gut plexuses
short post-synaptics
sympathetics of midgut
t10-12 pass through lesser t10-11 or least t12 sphlancnic nerve and synapse in superior mesenteric ganglion
postsynaptics follow branches of SMA to organ
parasympathetics of midgut
pass through vagus nerve, superior messenteric plexus, follow branches of SMA to organ, synapse in gangli in gut plexuses
shortpostynaptics
sympathetics of hindgut
arise from L1-2, pass through lumbar splanchnic nerves, synapse in inferior mesenteric gangliion
postsynaptics follow branches of IMA to organ
parasympathetics of hindgut
arise from S234 pass through sacral spinal nerves, pelivc splanchnic nerves, branches to colon pass through hypogastric plexus and inferior mesenteric plexus, follow branches of IMA to target, synapse in gut plexuses
short postsynaptics