释义 |
DictionarySeedigastricdigastric 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 muscleNeck 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: muscleThesaurusSeemuscle |