Week 7 Flashcards
(17 cards)
what is the nerve plexus in the submucosa of GIT called
Meisnner’s nerve plexus
what is the nerve plexus in the muscularis of GIT called
Auerbach’s
what are the three layers of muscularis mucosa in the stomach
: outer longitudinal, middle
circular, and inner oblique
what cells are found in the mucosa layer of the intestine
-absorptive
-goblet- secret mucous
-Enteroendocrine: secrete hormones, same as stomach
-m cells: carry antigens to MALT
-Paneth: secrete anti-microbial lysozymes
what is Plicae circularis and where are they most prominent
the folding of both the mucosa and submucosa.
most prominent in jejenum
where are lacteal vessels found
jejunum
features of jejunum
he jejunum has the largest surface area for luminal secretion and absorption
* It has a thicker wall and a wider lumen compared to the ileum
* Plicae circulares are thicker, taller, and more numerous in the jejunum
* Most of the cells found in the simple columnar epithelium are enterocytes – tall columnar absorptive
cells and contain oval shaped nuclei that are located basally
* Apical border usually striated in appearance
* The core of each villus = highly vascularized lamina propria, systemic capillaries, and one larger
lymphatic lacteal (for the transport of fats to the liver)
features of ileum
The ratio of goblet cells:enterocytes is the greatest in ileum
* Large amounts of gut associated lymphoid tissue (GALT) MALT
* Peyers patches (aggregated lymphoid nodules) in the LP – most common in the distal ileum
what is the pH of saliva
6.7-7.4
what type of gland is the salivary gland
tubuloacinar glands
3 types of salivary glands and what are their secretions
-submandibular: mostly serous and partially mucous
-parotid: serous
-sublingual: mucous
Ductal system of Salivary Glands
- Basal striations are folds within the basal surface to maximize SA for
ion channels. - Intercalated ducts – close to acini (simple cuboidal lining).
- Striated ducts - become more columnar.
- Interlobular duct = from the intralobular duct as they enter the CT
between lobules - septas join together until the main duct is formed. - All digestive organs including pancreas and liver develop from gut
tube and maintain contact via their ducts
what is pancreatic juice composed of
Amylase
* Lipase
* Trypsin
* Carboxypeptidase
* Bicarbonate
what cells secret bicarbonate fluid
Centroacinar cells
what does the portal space/portal triad in the liver contain
-portal vein(entry)
-hepatic artery(entry)
-bile duct(exit)
what are Kupffer cells and where are the found
- detect and engulf bacteria and breakdown aged erythrocytes.
they are found in the hepatic sinusoids
order of blood flow in the liver
portal triad through sinusoidal channels into a central vein → inferior vena cava > right atrium of the heart
