anterior belly of digastric imuscle nnervation

The trigeminal nerve is one of the twelve cranial nerves, nerves that originate directly from the brain.įor its part, the posterior belly is innervated by the facial nerve. This ending is a branch of the inferior alveolar nerve that comes from the mandibular branch of the trigeminal nerve. Regarding the neurological endings, the anterior belly is innervated by the mylohyoid nerve, which has its same embryological origin. The anterior belly of the muscle is supplied by the sub-mental artery, which is a direct branch of the facial artery while the posterior belly receives the occipital artery and the posterior auricular artery, both direct branches of the external carotid artery. In that sense, each segment of the digastricus behaves like an individual muscle. The embryological origin of the two portions that make up the digastric muscle is not the same, which is why each belly is independent in terms of its irrigation and innervation, receiving these supplies from different structures. The anterior belly also works by helping to lower the jaw during speech, while the posterior belly contributes with other muscles in the extension movement of the head. The two bellies of the digastric muscle work synergistically during the chewing and swallowing processes. It is characterized by being related to all the muscular and ligamentous structures of that cervical area, including the digastric muscle, without being articulated to any other bone. The hyoid is a single, horseshoe-shaped bone located in the middle of the neck. While the tendon that joins them passes through a space formed by a fibrous band that inserts into the hyoid bone. The anterior belly of the muscle attaches to the mandible and the posterior to the temporal bone of the skull. Both are connected to each other by means of a tendon. The digastric It is a muscle located in the anterior region of the neck and which is made up of two portions or bellies, one anterior and one posterior.

Anterior belly of digastric imuscle nnervation