WordNet

of or characteristic of low rank or importance
one of lesser rank or station or quality
having an orbit between the sun and the Earths orbit; "Mercury and Venus are inferior planets"
lower than a given reference point; "inferior alveolar artery"
of low or inferior quality
become tight or as if tight; "Her throat constricted" (同)constringe, narrow
any of various large nonvenomous snakes that kill their prey by crushing it in its coils

PrepTutorEJDIC

(階級・親分・質・程度などが)『下の』,『劣る』, / (位置が)低い,下方の / 目下の者;劣った人
〈物など〉'を'締めつける,圧縮する
括役筋・周縮筋 / 獲物を締め殺ず大蛇(ぼあなと)

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出典(authority):フリー百科事典『ウィキペディア（Wikipedia）』「2015/09/17 02:10:16」(JST)

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The Inferior pharyngeal constrictor, the thickest of the three constrictors, arises from the sides of the cricoid and thyroid cartilage. Similarly to the superior and middle pharyngeal constrictor muscles, it is innervated by the vagus nerve (cranial nerve X), specifically, by branches from the pharyngeal plexus and by neuronal branches from the recurrent laryngeal nerve.

Origin and insertion

The muscle is composed of two parts. The first (and more superior) arising from the thyroid cartilage (thyropharyngeal part) and the second arising from the cricoid cartilage (cricopharyngeal part).^[1]

On the thyroid cartilage it arises from the oblique line on the side of the lamina, from the surface behind this nearly as far as the posterior border and from the inferior cornu.

From the cricoid cartilage it arises in the interval between the Cricothyreoideus in front, and the articular facet for the inferior cornu of the thyroid cartilage behind.

From these origins the fibers spread backward and medialward to be inserted with the muscle of the opposite side into the fibrous pharyngeal raphe in the posterior median line of the pharynx.

The inferior fibers are horizontal and continuous with the circular fibers of the esophagus; the rest ascend, increasing in obliquity, and overlap the Constrictor medius.

Action

As soon as the bolus of food is received in the pharynx, the elevator muscles relax, the pharynx descends, and the constrictors contract upon the bolus, and convey it downward into the esophagus.During deglutination,they contract and cause peristaltic movement in the pharynx.

Role in human disease

Uncoordinated contraction, and/or Cricopharyngeal Spasm and/or impaired relaxation of this muscle are currently considered the main factors in development of a Zenker's diverticulum. Zenker's diverticulum develops between the two bellies of the inferior constrictor (Thyropharyngeal and Cricopharyngeal) in a small gape called Killian's dehiscence. A diverticulum can form where a balloon of mucosa becomes trapped outside the pharyngeal boundaries. Food or other materials may reside here, which may lead to infection.

Motor incoordination of the cricopharyngeus can cause difficulty swallowing.

Additional images

Muscles of the neck. Lateral view.
Side view of the larynx, showing muscular attachments.
Inferior pharyngeal constrictor muscle
Deep dissection of larynx, pharynx and tongue seen from behind

References

This article incorporates text in the public domain from the 20th edition of Gray's Anatomy (1918)

^ Origin, insertion and nerve supply of the muscle at Loyola University Chicago Stritch School of Medicine

External links

-375783347 at GPnotebook
lesson8 at The Anatomy Lesson by Wesley Norman (Georgetown University) (latpharyngealitems3)

UpToDate Contents

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English Journal

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Effect of body posture on involuntary swallow in healthy volunteers.

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Japanese Journal

高齢者の嚥下機能

兵頭政光
日本気管食道科学会会報 65(5), 373-378, 2014
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NAID 110006570181

再手術時に反回神経再建術を行った再発進行甲状腺癌の1例

川口康夫,杉野圭三,西原雅浩,矢野将嗣,新原亮,浅原利正
日本臨床外科学会雑誌 = The journal of the Japan Surgical Association 65(9), 2315-2318, 2004-09-25
… The proximal edge of the recurrent laryngeal nerve was identified by separation of the inferior constrictor. …
NAID 10013671395

「下咽頭収縮筋」

Inferior pharyngeal constrictor muscle
	Muscles of the pharynx and cheek. (Constrictor pharyngis inferior visible at bottom left.)
	Muscles of the pharynx, viewed from behind, together with the associated vessels and nerves. (Inf. const. labeled at bottom center.)
Details
Latin	musculus constrictor pharyngis inferior
Origin	cricoid and thyroid cartilage
Insertion	pharyngeal raphe
Nerve	Pharyngeal plexus of vagus nerve
Actions	Swallowing
Identifiers
Gray's	p.1142
Dorlands; /Elsevier	m_22/12548631
TA	A05.3.01.111
FMA	46623
	Anatomical terms of muscle