Anatomy and Physiology of the Digestive Tract
|
Lips Prehension, sorting Tongue Gather and move the food around between the teeth and help in swallowing. Teeth Cut grass, grind and shred food material Mouth Hard and soft palate form the roof, salivary glands provide enzymes and saliva to start digestion and aid in swallowing Esophagus Smooth muscle tube connecting the mouth to the stomach, moves food by peristalsis, upper and lower esophageal sphincters are one way valves at each end. Stomach Glandular and non-glandular areas divided by margo plicatus, enzymes and acids are added for digesting , but main function is storing, pylorus is valve to the duodenum. Duodenum First part of small intestine, pancreas adds enzymes, bile duct adds bile (no gall bladder in the horse), starts digestion and absorption. Jejunum Longest part of small intestine, enzymatic digestion, absorption of nutrients. Ileum Last, short part of small intestine, leads to the cecum through the ileo-cecal valve Cecum Blind pouch, (appendix), digestion by microbial fermentation, absorption, two way peristalsis. Large Colon Right Ventral, Sternal flexure, Left Ventral, Pelvic flexure, Left Dorsal, Diaphragmatic Flexure, Right Dorsal to small colon, digestion by fermentation, absorption of nutrient and water. Small Colon Absorption of nutrients and water, dries out feces. Rectum Forms fecal balls, further drying, holds feces prior to evacuation. Anus Sphincter to regulate defecation. |
Equine Links | Contact Us | Doctor's Notes | Seasonal Notes