Week 2/Lab 2 Flashcards
Areas of the stomach
- 2 surfaces/walls(anterior and posterior)
- 2 borders(lesser and greater curvature)
- angular notch
- 2 orifices(cardial and pyloric)
- cardial notch
- pyloric sphincter
- cardia
- fundus(full of gas)
- body
- pyloric part
Difference between orifice and sphincter
orifice: opening
Sphincter: smooth muscle to control opening
Stomach function: storage
Rugae
-wrinkly layer due to muscularis mucosa)
Stomach function: mixing
A semifluid mixture of partly digested food with water and gastric juice to produce CHYME
Stomach function: physical breakdown
- smooth muscle of muscularis externa and HCL
- peristalsis and churning
Stomach function: chemical breakdown
via Pepsin
-breaks down proteins
Stomach function: controlled release
-movement of chyme into the small intestine is regulated by a valve at the end of the stomach(pyloric sphincter)
Name gastric glands from superficial to deep
- mucous surface cells
- mucous neck cells
- parietal cells
- chief cells
- enteroendocrine cells
Gastric pits
- inner layer of mucosa
- penetrate deep into the layer forming ducts whose walls are lined with gastric glands
Mucous surface cells
- secrete mucous
- protect lining of stomach from HCL
Mucous neck cells
- secrete mucous
- lines upper walls of ducts
- protect lining of stomach from HCL
Parietal(oxyntic) cells
- secrete HCL(activates pepsinogen for pepsin)
- Secretes intrinsic factor(helps small intestine with with absorption of vitamin B12)
Chief(zymogenic) cells
- secrete pepsinogen for pepsin
- secrete gastric lipase(enzyme to breakdown fat)
Enteroendocrine cells
-secrete various hormones that diffuse into nearby blood vessels
Gastrin
- enteroendocrine cell
- stimulates other glands in the stomach to increase their output
- puts the fire under them
- g cells
Abdominal aorta
- name change at the aortic hiatus
- ends by dividing into Left and Right common iliac arteries(around L4)
- Paired and unpaired branches
Unpaired branches of abdominal aorta
- come off the anterior surface of the aorta
- celiac trunk
- superior and inferior mesenteric artery
- mediaN sacral artery
Paired branches of abdominal aorta
- come off lateral side of aorta
- inferior phrenic arteries
- middle suprarenal arteries
- renal arteries
- Gonadal arteries(ovaries for F and testicular for M)
- Lumbar arteries(4 pairs)
Celiac trunk
-unpaired branch
-central hub for…
Left gastric artery
splenic artery
common hepatic artery
Left gastric artery
- smallest branch of celiac trunk
- supplies esophagus and stomach
- anastomoses with right gastric artery
Splenic artery
- largest branch of celiac trunk
- wavy
- relationship to splenorenal ligament
- supplies to pancreas, stomach, greater somentum and spleen
Common heptaic artery
- branches to the right off of the celiac trunk
- divides into proper hepatic artery and gastroduodenal artery