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Digastric muscle

from Greek: δίς ("dis") - twofold, double; and Latin: gaster - belly
Synonyms: digastricus, biventer muscle of the mandibula (obsolete)
German: Musculus digastricus

1 Definition

The digastric muscle is a skeletal muscle with two muscle bellies, which are connected by an intermediate tendon. It counts among the suprahyal muscles.

2 Devolution

In the digastric muscle, you can differentiate an anterior (venter anterior) and posterior muscle belly (venter posterior).

3 Origin

The origin of the smaller venter anterior is the digastric fossa of the mandible near the symphysis. From here, the venter draws into posterior and inferior direction.

The origin of the bigger venter posterior is the mastoid notch of the temporal bone. From here, the venter draws into anterior and inferior direction.

4 Insertion

The common insertion of both venters is the rounded intermediate tendon of the muscle that perforates the stylohyoid muscle. It is fixated on the hyoid bone by an annular ligament.

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5 Innervation

The innervation of the venter anterior is provided by the mylohyoid nerve form the third branch of the trigeminus (cranial nerve V3); the innervation oft the venter posterior is provided by the digastric branch of the facial nerve.

6 Function

The digastric muscle takes part in the swallowing act by lifting or fixating the hyoid bone. Furthermore, it helps with the opening of the jaws.

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Specialties: Anatomy

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