Puneet Varma (Editor)

Pharyngeal muscles

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Covid-19
TA  A04.2.06.001
FMA  46619 67169, 46619
Pharyngeal muscles
Nerve  receives motor innervation by Vagus nerve (CN X)
Latin  musculi pharyngis, musculus constrictor pharyngis or tunica muscularis pharyngis

The pharyngeal muscles are a group of muscles that form the pharynx, determining the shape of its lumen. The pharyngeal muscles contracts pushing the food into the esophagus. 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).

    References

    Pharyngeal muscles Wikipedia


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