Tutorial title - Motility
5 important questions on Tutorial title - Motility
What are the steps associated with GI motility?
2. Mastication: breakdown of food
3. Deglutition: swallowing of food bolus (bolus formation and swallow reflex)
4. Segmental contractions: further fragmenting of food
What nerves control each structures of GI motility?
2. Esophagus [skeletal/smooth]: ANS (vagus) in dogs and ruminants, ANS/ENS in cats and horses
- Cranial striated portion = ANS
- Caudal smooth muscle = ANS/ENS
What are the phases of swallowing?
2. Pharyngeal: propulsion of bolus from the base of tongue to the laryngopharynx while epiglottis covers the tracheal orifice
3. Cricopharyngeal: upper esophageal (cricopharyngeal) sphincter opens to allow bolus to enter the esophagus
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What structure prevents the swallowing of air?
What contributes to the movement of bolus from the esophagus to the stomach?
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