digastric muscle


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Related to digastric muscle: geniohyoid, Stylohyoid muscle

di·gas·tric mus·cle

(dī-gas'trik mŭs'ĕl)
1. One of the suprahyoid group of muscles consisting of two bellies united by a central tendon that is connected to the body of the hyoid bone; origin, by posterior belly from the digastric groove medial to the mastoid process; insertion, by anterior belly into lower border of mandible near midline; action, elevates the hyoid when mandible is fixed; depresses the mandible when hyoid is fixed; nerve supply, posterior belly from facial, anterior belly by nerve to the mylohyoid from the mandibular division of trigeminal.
2. A muscle with two fleshy bellies separated by a fibrous insertion;
Synonym(s): musculus digastricus [TA] .

digastric muscle

Neck muscle with two bellies. Origin: anterior belly attaches to the digastric fossa in mandible at base of anterior midline, posterior belly attaches to mastoid process. Insertion: tendon connecting both bellies in a loop of fascia that is attached to hyoid bone. Nerve: anterior belly -- trigeminal (CN V), posterior belly -- facial (CN VII). Action: lowers mandible and raises hyoid bone.
See: neck for illus.
See also: muscle
References in periodicals archive ?
the branch to the posterior belly of the digastric muscle
The tumor was bound anteriorly by the anterior digastric muscle and posteriorly by the sternocleidomastoid muscle and retromandibular fossa.
A posteroexternal approach to the hip joint: value of the formation of a digastric muscle.