Flashcards in Esophagus, stomach, duodenum Deck (32):
Where dos the esophagus enters the abdomen?
right crus of diaphragm
What is the physiologic esophageal sphincter?
a circular layer of smooth muscle at the terminal end of the esophagus
What is the esophageal sphincter function?
the contraction prevents the contents of the stomach from regurgitating
What forms the esophageal sphincter?
The gastroesophageal funtion, diaphragm musculature
Where is the location of the stomach?
left hypochondriac & epigastric region
supine position on stomach bed
What is the stomach covered by?
entirely by the peritoneum
What are the four regions of the stomach?
What is a pylorus?
region of stomach that connects to the duodenum.
What are the parts of the stomach?
greater and lesser curvatures,
cardiac & pyloric openings
cardiac & angular notches
What is the cardia?
part of the stomach that attaches to the esophagus
What is the fundus?
left portion of stomach body
marked of by plane passing through cardiac orifice
allows storage of gases produced by chemical digestion
What is the division of the pylorus?
What is the pylorus sphincter?
circular smooth muscles that control the rate of discharge of contents into the duodenum
surrounds the pylorus
What controls the pylorus sphincter?
Sympathetic - constricts
parasympathetic - relaxes
What are the arteries of the stomach?
right/left gastropiploic (gastroomental)
What are gastric rugae?
folds in stomach that provide stomach with extra surface area for food absorption
What is the gastric canal?
Formed by the ragae,
directs fluids to the pylorus
grooved channel of lesser curvature
What does the stomach produce?
Hydrochloric acid- destroys bacteria
pepsin- breaks down protein
produced in body and fundus
What does the pyloric antrum produce?
gastrin - stimulates gastric acid secretion
Parasympathetic fibers in vagus stimulate gastric secretion
Describe the duodenum?
C-shaped tube surrounding the head of the pancreas
smallest but widest part of intestine s
What is connects the duodenum to liver?
heptaduodenal ligament of the lesser omentum
What are the arteries of the duodenum?
Superior mesenteric (midgut)
What are the parts of the duodenum?
Describe the superior duodenum.
duodenal cap. has mobile free section
retroperitoneal (except first part)
pylorus invaginates into
Describe the descending part.
contains junction of the foregut & midgut (common bile duct and main pancreatic ducts open)
What does the descending part contain.
greater papilla - termianl openings of bile duct and main pancreatic ducts
lesser papilla- lies 2cm above greater papilla, site of entry for main pancreatic duct
Describe the transverse part
what lies behind the transverse part?
vertebral column lies to the left
What crosses the transverse part anteriorly?
superior messenteric vessels
locate the ascending part
left to the aorta at the second lumbar vertebrate
Where does the ascending part terminate?