Functions: ingestion, mechanical processing, digestion (chemical breakdown), secretion, absorption, excretion (defecation)
Peritoneum: Parietal peritoneum; inner wall of abdominal muscle cavity
Visceral peritoneum; outer wall of organs covered by mesentery sheets that take over/suspend organs from dorsal wall of abdominal cavity.
lesser omentums, A fold of the peritoneum joining parts of the stomach and duodenum to the liver
greater omentum, A fold of the peritoneum, passing from the stomach to the transversal colon
falciform ligament, a sickle-shaped sagittal fold of peritoneum that helps attach the liver to the diaphragm
Serous membrane secretes serous fluid for lubrication
Histology of GI tract, 4 layers:
1. Mucosa,Mucus producing epithelial layer with supportive lamina propria underneath. Stratified squamous in areas that dont absorb and are prone to friction, such as oral cavity, pharynx, esophagus.Simple columnar with goblet cells in different areas. Will also have enteroendocrine cells that secrete hormones that regulate measure of digestion.
Mucularis mucosae: 2 thin layers of dispassionate muscle to assist in shaping the lumen
2. Submucosa Connective tissue with blood and lymphatic vessels and eye plexus Meissner plexus) that support and control mucosa.
3. Muscalaris externa, 2 larger layers of smooth muscle, circular and longitudinal.
Movement is mostly controlled by enteric nauseated system (ENS), mostly through parasympathetic stimulation
4. serosa, Outer layer. oral exam cavity, pharynx, esophagus, rectum have no serosa, instead are firmly attached to surrounding tissue by an adventitia
Movement of bolus
Persistalsis, Pacesetter cells of muscularis externa take on rhythmically in response to stretch receptors. Circularis muscles behind bolus take aim first, keeping...If you want to get a full essay, order it on our website: Ordercustompaper.com
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