Salpingopharyngeus muscle

Salpingopharyngeus muscle
Dissection of the muscles of the palate from behind.
Details
OriginLower part of the cartilage of the auditory tube
InsertionFibers pass downward and blend with the palatopharyngeus muscle to the upper border thyroid cartilage, blending with constrictor fibers
ArteryAscending pharyngeal artery
NerveVagus nerve (CN X)
ActionsAssists in elevating pharynx, pulls on torus tubarius to pressure equalize middle ear
Identifiers
Latinmusculus salpingopharyngeus
TA98A05.3.01.115
TA22191
FMA46665
Anatomical terms of muscle

The salpingopharyngeus muscle is a muscle of the pharynx. It arises from the lower part of the cartilage of the Eustachian tube,[1] and inserts into the palatopharyngeus muscle by blending with its posterior fasciculus. It is innervated by vagus nerve (cranial nerve X) via the pharyngeal plexus. It raises the pharynx and larynx during deglutition (swallowing) and laterally draws the pharyngeal walls up. It opens the pharyngeal orifice of the Eustachian tube during swallowing to allow for the equalization of pressure between it and the pharynx.

Structure

The salpingopharyngeus is a very slender muscle.[1] It passes inferior-ward from its origin to its insertion[1][2] within the salpingopharyngeal fold.[3]

Origin

The salpingopharyngeus muscle arises from the inferior portion of the cartilaginous part of the pharyngotympanic tube near its pharyngeal opening.[2] Its origin creates the posterior welt of the torus tubarius.[4]

Insertion

It ends distally by blending with the palatopharyngeus muscle.[2]

Innervation

The salpingopharyngeus receives motor innervation from the pharyngeal plexus of the vagus nerve.[2]

Blood supply

The salpingopharyngeus muscle receives arterial supply from the ascending palatine artery, greater palatine artery, and the pharyngeal branch of the ascending pharyngeal artery.[2]

Variation

The salpingopharyngeus muscle is absent in about 40% of individuals. It is more common in thin individuals.[5]

Function

The salpingopharyngeus muscle raises the pharynx and larynx during deglutition (swallowing) and laterally draws the pharyngeal walls up.[6] Unusually, it is relaxed during deglutition, but contracts at all other times.[6] It opens the pharyngeal orifice of the Eustachian tube during swallowing allowing for the equalization of pressure between the it and the pharynx.[citation needed]

See also

Additional images

  • Torus tubarius dissection show salpingopharyngeus muscle
    Torus tubarius dissection show salpingopharyngeus muscle
  • salpingopharyngeus muscle dissection
    salpingopharyngeus muscle dissection

References

Public domain This article incorporates text in the public domain from page 1143 of the 20th edition of Gray's Anatomy (1918)

  1. ^ a b c Sinnatamby, Chummy (2011). Last's Anatomy (12th ed.). Elsevier Australia. p. 385. ISBN 978-0-7295-3752-0.
  2. ^ a b c d e Standring, Susan (2020). Gray's Anatomy: The Anatomical Basis of Clinical Practice (42nd ed.). New York. p. 711. ISBN 978-0-7020-7707-4. OCLC 1201341621.{{cite book}}: CS1 maint: location missing publisher (link)
  3. ^ Standring, Susan (2020). Gray's Anatomy: The Anatomical Basis of Clinical Practice (42nd ed.). New York. p. 711. ISBN 978-0-7020-7707-4. OCLC 1201341621.{{cite book}}: CS1 maint: location missing publisher (link)
  4. ^ Simkins, Cleveland S. (1943). "Functional Anatomy of the Eustachian Tube". Archives of Otolaryngology–Head & Neck Surgery. 38 (5): 476–84. doi:10.1001/archotol.1943.00670040495009.
  5. ^ Albahout, Khaled S.; Lopez, Richard A. (2022), "Anatomy, Head and Neck, Pharynx", StatPearls, Treasure Island (FL): StatPearls Publishing, PMID 31334991, retrieved 2023-01-12
  6. ^ a b Guindi, G. M.; Charia, K. K. C. (1980-11-01). "A reappraisal of the salpingo-pharyngeus muscle". Archives of Oto-Rhino-Laryngology. 229 (2): 135–141. doi:10.1007/BF00454236. ISSN 1434-4726. PMID 7458769. S2CID 3126653.