Hyoglossus

Hyoglossus
Hyoglossus
	Extrinsic muscles of the tongue. Left side. (Hyoglossus visible at center.)
	Muscles of the neck. Anterior view. Hyoglossal muscle in purple
Details
Origin	Hyoid
Insertion	side of the tongue
Nerve	Hypoglossal (CN XII)
Actions	depresses and retracts the tongue
Identifiers
Latin	musculus hyoglossus
TA98	A05.1.04.102
TA2	2118
FMA	46691
	Anatomical terms of muscle [edit on Wikidata]

The hyoglossus, thin and quadrilateral, arises from the side of the body and from the whole length of the greater cornu of the hyoid bone, and passes almost vertically upward to enter the side of the tongue, between the styloglossus and the inferior longitudinal muscle of the tongue. It forms a part of the floor of submandibular triangle.

Structure

The fibers arising from the body of the hyoid bone overlap those from the greater cornu.

Structures that are medial/deep to the hyoglossus are the glossopharyngeal nerve (cranial nerve 9), the stylohyoid ligament and the lingual artery and lingual vein.

The lingual vein passes medial to the hyoglossus, and the lingual artery passes deep to the hyoglossus. Laterally, in between the hyoglossus muscle and the mylohyoid muscle lay several important structures (from upper to lower): sublingual gland, submandibular duct, lingual nerve, vena comitans of hypoglossal nerve, and the hypoglossal nerve. Note, posteriorly, the lingual nerve is superior to the submandibular duct and a portion of the submandibular salivary gland protrudes into the space between the hyoglossus and mylohyoid muscles.

Function

The hyoglossus depresses and retracts the tongue and makes the dorsum more convex.

Additional images

Hyoid bone. Anterior surface. Enlarged.
Muscles of the neck. Lateral view.
The internal carotid and vertebral arteries. Right side.
Distribution of the maxillary and mandibular nerves, and the submaxillary ganglion.
Hypoglossal nerve, cervical plexus, and their branches.
Coronal section of tongue, showing intrinsic muscles.
Hyoglossus Muscle