Flashcards in 010514 normal structure of upper GI Deck (31):
four tunics of the general GI tract
muscularis mucosae's fxn
local mvments of the mucosa and folding of the mucosa
composition of submucosa
loose collagenous and adipose tissue
large blood vessels and lymphatic vessels
mucous secreting glands in esophagus and duodenum
Meissner's plexus (parasympathetic ganglia)
muscularis externa has an inner layer of what?
circular muscular layer
nervous tissue in the muscularis externa is called?
myenteric (Auerbach's) plexus
what does myenteric plexus control
what does Meissner's plexus control
muscularis mucosae movement
adventitia vs serosa
adventitia is loose connec tissue layer surrounding the GI tract; it's located outside of the peritoneal cavity
serosa is simple squmous epithelium (mesothelium) along with connective tissue that covers the GI tract WITHIN the peritoneal cavity
what regulates the enteric nervous system?
autonomic nervous system
or hormones secreted by enteroendocrine cells
enteric nervous system
division of the autonomic nervous system
what does the paraysympathetic enteric nervous system do?
stimulates secretion and peristalsis
what does sympathetic enteric nervous sys do?
represses peristalsis and activates activity of sphincters
tubular glands are found in
stomach (secretory fxns)
epithelium of esophagus consists of
stratified non-keratinized squamous epithelium with Langerhans cells
esophageal cardiac glands are located where, and what do they do?
secrete mucous to help propel food
submucosa of esophagus contains
esophageal glands (only esophagus and duodenum have glands in their submucosa)
esophageal glands of submucosa have what two cell types?
mucous cells (basal nucleus)
serous cells (centrally located nucleus)
what do serous cells of the esophageal glands of submucosa secrete?
pepsinogen and lysozyme
two physiological sphincters of the esophagus
four regions of the stomach
fundus-secretes acid and enyzmes
body-secretes acid and enzymes
gastric glands are found where in the stomach?
Auerbach's plexus is found in what layer?
gastric gland has what regions?
six cell types of the gastric gland
surface mucous/lining cells (gastric pit)
parietal (oxyntic) cells (isthmus, neck, base)
neck mucous cells (neck and base)
chief cells (base)
enteroendocrine cells (base)
stem cells (neck)
surface lining cells of the gastric gland secrete what?
mucous that's thick and dense--the mucous adheres to the mucosa and protects against acid
fxn of mucous neck cells
secrete soluble mucous to lubricate stomach contents
what are some things enteroendocrine cells secrete?
gastrin (G cells)
histamine (ECL cells)
parietal cells' fxn
make HCl and gastric intrinsic factor
secretory canalicus is associated with
what causes enzyme release from chief cells?