Gastrointestinal Arteries and Nerves - Ashley Flashcards
Mneumonic for where structures enter the abdomen
I ate 10 eggs at 12
IVC - 8
Esophagus - 10
Aorta - 12
Abdominal aorta
Begins at T12
Retroperitoneal
Terminates at L4
-bifurcates into L and R common iliac arteries
Where does the thoracic duct drain?
Into the LEFT subclavian vein
AAA
Balloon like dilation of aorta when media (usually) weakens
Usually below renal arteries and above aortic bifurcation
Primarily due to atherosclerosis
Unpaired branches of aorta
Supply GI structures and branch anteriorly
-Celiac trunk, superior mesenteric, inferior mesenteric, median sacral a.
Paired branches of aorta
Supply non-GI structures and branch laterally
-inferior phrenic, testicular/ovarian, suprarenal, renal, common iliac
Innervation of abdominal viscera
Nerve plexi Networks containing symp, parasymp, afferent nerve fibers and respective ganglia Some interconnected Named for nearest branch of aorta -celiac, sup mes, inf mes
Where do presynaptic fibers aries from?
Gray matter of spinal cord at T5-L2, L3
Conveyed via abdominopelvic splanchnic nerves
What is the main source of presynaptic sympathetic fibers to abdominal viscera?
Greater splanchnic
T5-9
Others contribute - Lesser (T10-11) and Least (T12)
Pelvic splanchnic n.
Derive from anterior rami of S2-4
NOT associated with sympathetics
Innervation beyond left colic flexure
What provides innervation up to left colic flexure?
Ant and post vagal trunks
-convey presynaptic and visceral afferent reflex fibers to abdominal aortic plexuses and periarterial plexuses
2 Principle plexuses of enteric nervous system
- Myenteric plexus - motility
2. Submucosal plexus - secretions, blood flow, absorption
Celiac trunk
3 branches - L gastric, splenic, common hepatic
Common hepatic a. branches into these two arteries?
- Proper hepatic –> R gastric –> R and L hepatic
2. Gastroduodenal a. –> R gastro-omental and superior pancreaticoduodenal
2 branches of splenic artery?
Short gastric
L gastro-omental
