Difference between revisions of "Deglutition"
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==Introduction== | ==Introduction== | ||
| − | Deglutition is the process of swallowing. Food is passed from the [[Oral Cavity - Oropharynx - Anatomy & Physiology|oral pharynx]] into the oesophageal/laryngeal [[Pharynx - Anatomy & Physiology|pharynx]] whilst the [[epiglottis]] closes across the entrance of the [[Trachea - Anatomy & Physiology|trachea]]. | + | Deglutition is the process of swallowing. Food is passed from the [[Oral Cavity - Oropharynx - Anatomy & Physiology|oral pharynx]] into the oesophageal/[[Larynx - Anatomy & Physiology#Laryngeal Pharynx|laryngeal]] [[Pharynx - Anatomy & Physiology|pharynx]] whilst the [[epiglottis]] closes across the entrance of the [[Trachea - Anatomy & Physiology|trachea]]. |
It is a voluntary reflex preventing food from passing into the [[Trachea - Anatomy & Physiology|trachea]] causing choking and eventually respiratory pneumonia. | It is a voluntary reflex preventing food from passing into the [[Trachea - Anatomy & Physiology|trachea]] causing choking and eventually respiratory pneumonia. | ||
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5. [[Epiglottis]] bends back to prevent food entering [[Larynx - Anatomy & Physiology|larynx]]. | 5. [[Epiglottis]] bends back to prevent food entering [[Larynx - Anatomy & Physiology|larynx]]. | ||
| − | 6. Bolus enters | + | 6. Bolus enters [[Larynx - Anatomy & Physiology#Laryngeal Pharynx|laryngeal pharynx]] and [[Oral Cavity - Tongue - Anatomy & Physiology|tongue]] relaxes. Bolus is passed on down [[Oesophagus - Anatomy & Physiology|oesophagus]] by a concentric series of contractions by each set of contractor muscle in turn called [http://en.wikipedia.org/wiki/Peristalsis| peristalsis] |
7. Pharyngeopalatine arch reopens, [[Hyoid Apparatus - Anatomy & Physiology|hyoid]] moves back by geniohyoid and glottis reopens. | 7. Pharyngeopalatine arch reopens, [[Hyoid Apparatus - Anatomy & Physiology|hyoid]] moves back by geniohyoid and glottis reopens. | ||
==Links== | ==Links== | ||
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| + | [[Skull and Facial Muscles - Anatomy & Physiology]] | ||
[[Diseases of the conducting airways]] | [[Diseases of the conducting airways]] | ||
Revision as of 19:28, 30 July 2008
Introduction
Deglutition is the process of swallowing. Food is passed from the oral pharynx into the oesophageal/laryngeal pharynx whilst the epiglottis closes across the entrance of the trachea.
It is a voluntary reflex preventing food from passing into the trachea causing choking and eventually respiratory pneumonia.
Process
1. Masticated and insalivated food is cupped by the tongue on its dorsal surface and the tip of the tongue pushes dorsally against the soft palate
2. The jaws are closed. The mylohyoid, hyoglossal and stylohyoid mucles raises the tongue and pushes the bolus into the oropharynx. When the food touches the pharyngeal mucosa the swallowing reflex is initiated.
3. Oropharynx relaxes and soft palate elevated by the levator velli palatini muscle. Pharyngeopalatine arch closes by palatopharyngeus.
4. Hyoid moved rostro-dorsally by geniohyoid and pterygopharyngeus contracts bringing common pharynx forward to engulf bolus.
5. Epiglottis bends back to prevent food entering larynx.
6. Bolus enters laryngeal pharynx and tongue relaxes. Bolus is passed on down oesophagus by a concentric series of contractions by each set of contractor muscle in turn called peristalsis
7. Pharyngeopalatine arch reopens, hyoid moves back by geniohyoid and glottis reopens.