Difference between revisions of "Deglutition"
m (Text replace - "[[Soft Palate - Anatomy & Physiology|" to "[[Soft Palate|") |
m (Text replace - "Oral Cavity - Tongue - Anatomy & Physiology" to "Tongue - Anatomy & Physiology") |
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==Process== | ==Process== | ||
| − | 1. [[Mastication|Masticated]] and insalivated food is cupped by the [[ | + | 1. [[Mastication|Masticated]] and insalivated food is cupped by the [[Tongue - Anatomy & Physiology|tongue]] on its dorsal surface and the tip of the [[Tongue - Anatomy & Physiology|tongue]] pushes dorsally against the [[Soft Palate|soft palate]] |
| − | 2. The jaws are closed. The mylohyoid, hyoglossal and stylohyoid mucles raises the [[ | + | 2. The jaws are closed. The mylohyoid, hyoglossal and stylohyoid mucles raises the [[Tongue - Anatomy & Physiology|tongue]] and pushes the bolus into the [[Oral Cavity - Oropharynx - Anatomy & Physiology|oropharynx]]. When the food touches the pharyngeal mucosa the swallowing reflex is initiated. |
3. [[Oral Cavity - Oropharynx - Anatomy & Physiology|Oropharynx]] relaxes and [[Soft Palate|soft palate]] elevated by the levator velli palatini muscle. Pharyngeopalatine arch closes by palatopharyngeus. | 3. [[Oral Cavity - Oropharynx - Anatomy & Physiology|Oropharynx]] relaxes and [[Soft Palate|soft palate]] elevated by the levator velli palatini muscle. Pharyngeopalatine arch closes by palatopharyngeus. | ||
| Line 17: | Line 17: | ||
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 [[Larynx - Anatomy & Physiology#Laryngeal Pharynx|laryngeal pharynx]] and [[ | + | 6. Bolus enters [[Larynx - Anatomy & Physiology#Laryngeal Pharynx|laryngeal pharynx]] and [[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. | ||
Revision as of 17:07, 4 September 2010
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 an involuntary reflex preventing food from passing into the trachea and thus preventing choking and 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.