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Cricopharyngeal Part of Inferior Pharyngeal Constrictor
Muscular System

Cricopharyngeal Part of Inferior Pharyngeal Constrictor

Pars cricopharyngea constrictoris inferioris pharyngis

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Quick Facts

Origin: Lateral aspect of cricoid cartilage of larynx.

Insertion: Pharyngeal raphe.

Action: Constriction of mid-pharynx during swallowing.

Innervation: Pharyngeal plexus (CN X).

Arterial Supply: Ascending pharyngeal artery and pharyngeal branches of inferior thyroid artery.

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Origin

The inferior pharyngeal constrictor muscle is the thickest of the three constrictor muscles. It can be divided into the thyropharyngeus and the cricopharyngeus, which are named according to their laryngeal attachments. The cricopharyngeus muscle originates from the lateral aspect of the cricoid cartilage.

Insertion

Both portions of the inferior pharyngeal constrictor muscle course posteromedially and merge with their contralateral counterpart along the pharyngeal raphe. The cricopharyngeus extends inferiorly and blends with the esophagus (Standring, 2016).

Key Features & Anatomical Relations

There are two potential points of weakness in the inferior region of the insertion of the inferior constrictor. These are Killian’s triangle and Laimer’s triangle and sit above and below the cricopharyngeus, respectively (Standring, 2016).

Actions

The cricopharyngeus part of the inferior pharyngeal constrictor muscle aids in the closure of the upper esophagus. The upper esophageal sphincter sits at the bridge between the hypopharynx and the cervical esophagus. The cricopharyngeus must maintain sustained tonic contraction to permit a basal muscular tone, while retaining the ability in rapid relaxation, as required in swallowing or vomiting (Standring, 2016).

List of Clinical Correlates

- Hypopharyngeal diverticula

References

Standring, S. (2016) Gray's Anatomy: The Anatomical Basis of Clinical Practice. Gray's Anatomy Series 41st edn.: Elsevier Limited.

Learn more about this topic from other Elsevier products

Cricopharyngeus Muscle

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Junction of cricopharyngeus muscle and proximal cervical esophagus is located in midcervical level

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