GIT

lec.3 13 March 13

UPPER GIT (mouth ,pharynx ,esophagus & stomach)

Mouth

Objectives Ingestion Mechanics of ingestion Salivary glands and saliva 1.composition of saliva 2.functions of saliva 3.control of saliva

Mastication( Chewing) anterior teeth (incisors)---- strong cutting posterior teeth (molars), -----grinding action.

Salivary Glands and Saliva

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Salivary Glands and Saliva

Control of salivary secretion



pharynx
Objectives Physiological anatomy Swallowing process. Stages: 1. Voluntary oral stage 2.Involuntary pharyngeal stage 3.involuntary esophageal stage

Swallowing ( Deglutition)

Pharyngeal stage
)

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Q :Swallowing is difficult when the mouth is open Why? ..

esophagus
Objectives Physiological anatomy Esophageal stage of swallowing 1.Primary peristalsis 2.Secondary peristalsis. Esophageal secretion

3. Esophageal Stage