Intestines Flashcards
Secretin final effect
increases pH
Intestinal Enteroendicrine Cells secrete
- Secretin
2. CCK (Cholecystokinin)
Paneth Cells secrete
lysozyme
Paneth cell location
deep in intestinal crypts in duodenum & jejunum
Paneth cell granule direction
face lumen of crypt
lysozyme
bacteriocidal helps protect lining of the intestine
Plica Circulares
- gross structures
- circular folds of mucosa & submucosa
- pronounced in jejunum
What increases surface area in small intestine?
length, Plica circulares, villi, microvilli,
Tunica Muscularis in ALL digestive system tubes
inner layer = circular smooth m.
outer layer = longitudinal smooth m.
Small intestine ID features
- Villi
2. Enterocytes & Goblet cells
Sm. Intestine Lamina Propria
- Central lacteals
- Strands of smooth mm.
- Intestinal Crypts/Glands
Central Lacteals
- transport lymph & lipids
- in center of each villus
Brunner’s glands
- in duodenum
- mostly mucous secreting cells
- increase pH of acidic chyme
Intestinal Crypts/Glands
epithelial-lined spaces
Lamina Subglandularis parts
stratum compactum
stratum granulosum
Lamina Subglandularis location
- deepest LP & in proximal jejunum
- stomach too
- ONLY carnivores
Intestinal Enteroendocrine cell morphopologies
- acidophilic granules toward LP
- unstained cytoplasm around nucleus (HALO)
Secretin stimulates
pancreatic duct cells to release bicarbonate to increase chyme’s pH
CCK stimulates
pancreatic acini to secrete digestive enzymes & gallbladder contraction
Intestinal nerve plexuses
- autonomic ganglia not surrounded by CCT
- responsible for peristalsis
- submucosal plexus
- myenteric plexus
Large intestine key features
- NO villi
- few enteroendocrine cells
- thin muscularis mucosa
Taenia coli
- longitudinal bands of smooth muscle seen grossly
- in horses, pigs, ppl
