GI Organ Anatomy Flashcards
what is magenstrasse
“stomach street” quick path for liquid and pills, site for ulcer formation
caustic substances leave dark streaks
brunners gland location/ fn
duodenum, secrete alkaline fluid and human epidermal growth factor
picae circulares location/ fn
jejunum, spiral folds for increasing surface area
peyers patches location/ fn
lymphoid nodules into submucosa, mainly in ileum
2 structures in the second/descending part of the duodenum
major papilla: opening of common bile duct and pancreatic duct
minor papilla: opening of accessory pacreatic duct
important structures near 3rd part of duodenum
crosses over aorta and under SMA (nutcracker, along w/ renal vein), around L3 and beginning of midgut
termination and junction of 4th/ascedning part of duodenum
terminates at duodenojejunal junction, held in place by suspensory ligament (ligament of treitz)
2 upper corners of colon
right colic flexure (hepatic)
left colic flexure (splenic)
describe appendix
contains large amounts of lymphoid tissue, suspended by mesoappendix
what happens 2/3 across transverse colon
switches from midgut to hindgut
innervation becomes S2-S4 instead of vagus, blood supply from SMA to IMA
peritoneal status of colon
ascending- secondarily retro
Transverse- intra
desceding- secondarily retro
sigmoid- intra
ampulla
lower dilated part of rectum where feces are stored
anal canal 2 zones
above pectinate line: mucous membrane, simple columnar/cuboidal, visceral sensory, venous drainage to portal, lymphatic to internal iliac
below pectinate (pretty much opposite): skin, stratified squamous, general sensory, venous to caval, lymphatic to superficial inguinal
2 diff anal sphincter
inner: smooth muscle muscularis externa
outer: skeletal muscle, subcutaneous, superficial and deep
5 ligaments of liver
falciform- anterior to ab wall
triangular- attach to diaphragm
coronary- to diaphragm
hepatogastric- attaches to stomach
hepatoduodenal
porta hepatis
door of the liver for portal triad
liver and gallbladder connection to duodenum
hepatic duct to common hepatic duct (gallbladder connects via cystic duct), then to common bile duct
sphincter of Oddi
pancreatic and common bile duct entering duodenum
sympathetic vs parasympathetic nerve origin
para: craniosacral
symp: thoracolumbar
innervation of foregut
para: vagus
symp: thoracic splanchnic nerve to celiac ganglion
innervation of midgut and kidney
para: vagus
symp: lesser thoracic splanchnic to aorticorenal and sup mes ganglion
innervation of the hindgut
para: pelvic splanchnic nerves
symp: lumbar splanchnic to inferior mesenteric ganglion
