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pharyngeal muscles
The pharyngeal muscles are a group of muscles that act upon the pharynx.
Pharyngeal muscles contracts pushing the food into the oesophagus. There are two muscular layers of the pharynx: the outer circular layer and the inner longitudinal layer.
The outer circular layer includes:
* Inferior constrictor muscle
* Middle constrictor muscle
* Superior constrictor muscle
During swallowing, these muscles constrict to propel bolus downwards (an involuntary process).
The inner longitudinal layer includes:
* Stylopharyngeus muscle
* Salpingopharyngeus muscle
* Palatopharyngeus muscle
During swallowing, these muscles act to shorten and widen the pharynx.
They are innervated by the pharyngeal branch of the Vagus nerve (CN X) with the exception of the stylopharyngeus muscle which is innervated by the glossopharyngeal nerve (CN IX).
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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