Swallowing

Mechanism Of Swallowing

Learning Objectives:

At the end of the lecture, the student should be able to:

Define Swallowing.
Describe the anatomy of the swallowing chemical mechanism.
Explain the sup process.
Stages of swallowing.
Coordination of swallowing and ventilating system.
Mechanism of swallowing.
Swallowing reflex.

Digestive System:

Organ system that processes nutrient extr typifys nutrients from it and eliminates the residue.

Digestive Processes:

Ingestion.

Propulsion.

Digestion.
Mechanical digestion.
Chemical digestion.

Absorption.

Defecation.

Swallowing:

The term swallowing refers to:

Entire act of deglutition from placement of diet in mouth,
Manipulation of food in viva voce cavity,
oral, pharyngeal and esophageal stages of swallowing until food enters tolerate.


trope of the swallowing mechanism:

The anatomic area of swallowing mechanism consists of the oral cavity, pharynx, larynx and esophagus.

Mechanism Of Swallowing:

A complicated mechanism, principally because pharynx subserves respiration as well as swallowing.
Pharynx is converted for exclusively a few seconds at a time into a tract for propulsion of food.
Respiration not to be compromised because of swallowing.





Physiology of swallowing mechanism:

Swallowing is composed of four distinct phases:

1- Oral preparatory phase,
2 - Oral phase,
3 - Pharyngeal phase
4 - esophageal phase.

Duration and characteristics of these phases are highly dependent on:
hoi polloi and type of the food &
Voluntary control on swallowed bolus.

close to types of swallow do not involve all phases,

For ideal swallowing saliva in pharynx does not include oral preparatory and oral phases of swallow.

Physiology of Deglutition (Swallowing):

Moving bolus from mouth to stomach:
Facilitated by saliva, mucous secretions.
Involves mouth, pharynx, and esophagus.

Buccal phase:
Voluntary.
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