VAN 121: Veterinary Gross Anatomy-II (2+2)

MUSCLES OF THE PHARYNX

• They form the muscular wall of the pharynx. Theses are described below.

Stylo- pharyngeus

• Arises from the great cornu or hyoid bone, near its dorsal extremity.
• It is the dilator of the pharynx.

Palato-pharyngeus

• Arises from the vertical part of the palatine and body of the sphenoid bones.
• It shortens the pharynx.

Pterygo-pharyngeus

• Arises from the pterygoid process.
• It shortens the pharynx.

Aryteno-pharyngeus

• Small muscle arises from the posterior aspect of the arytenoid cartilage.

Hyo-pharyngeus

• Arises from the thyroid cornu of the hyoid bone.

Thyro-pharyngeus

• Arises from the lamina of thyroid cartilage.

Crico-pharyngeus

• Arises from the lateral part of the arch of the cricoid cartilage.
• Action of the last three muscles: Constriction of the pharynx.
• Blood supply: Common carotid, external carotid and external maxillary arteries.
• Nerve supply: Fifth, ninth and tenth cranial nerves.