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The digastric muscle (named digastric as it has two bellies) is a small muscle located under the jaw. The two bellies are separated by an intermediate tendon, which runs through a sling on the side of the hyoid bone.
The posterior belly arises on the inferior surface of the skull, from the medial surface of the mastoid process of the temporal bone and a deep groove between the mastoid process and the styloid process called the digastric groove. The anterior belly is attached to the front of the mandible.
The two bellies of the digastric muscle have different embryological origin, and are supplied by different cranial nerves. The posterior belly is supplied by a branch of the facial nerve, and the anterior body supplied by the trigeminal via the mylohyoid nerve.
When the digastric muscle contracts, it acts to elevate the hyoid bone. If the hyoid is being held in place (by the infrahyoid muscles), it will tend to depress the mandible (open the mouth).
The Digastricus (Digastric muscle) consists of two fleshy bellies united by an intermediate rounded tendon.
It lies below the body of the mandible, and extends, in a curved form, from the mastoid process to the symphysis menti.
The posterior belly, longer than the anterior, arises from the mastoid notch of the temporal bone and passes downward and forward.
The anterior belly arises from a depression on the inner side of the lower border of the mandible, close to the symphysis, and passes downward and backward.
The two bellies end in an intermediate tendon which perforates the Stylohyoideus muscle, and is held in connection with the side of the body and the greater cornu of the hyoid bone by a fibrous loop, which is sometimes lined by a mucous sheath.
A broad aponeurotic layer is given off from the tendon of the Digastricus on either side, to be attached to the body and greater cornu of the hyoid bone; this is termed the suprahyoid aponeurosis.
Variations
Variations are numerous. The posterior belly may arise partly or entirely from the styloid process, or be connected by a slip to the middle or inferior constrictor; the anterior belly may be double or extra slips from this belly may pass to the jaw or Mylohyoideus or decussate with a similar slip on opposite side; anterior belly may be absent and posterior belly inserted into the middle of the jaw or hyoid bone. The tendon may pass in front, more rarely behind the Stylohoideus. The Mentohyoideus muscle passes from the body of hyoid bone to chin.
Triangles
The Digastricus divides the anterior triangle of the neck into three smaller triangle
- (1) the submaxillary triangle, bounded above by the lower border of the body of the mandible, and a line drawn from its angle to the Sternocleidomastoideus, below by the posterior belly of the Digastricus and the Stylohyoideus, in front by the anterior belly of the Diagastricus;
- (2) the carotid triangle, bounded above by the posterior belly of the Digastricus and Stylohyoideus, behind by the Sternocleidomastoideus, below by the Omohyoideus;
- (3) the suprahyoid or submental triangle, bounded laterally by the anterior belly of the Digastricus, medially by the middle line of the neck from the hyoid bone to the symphysis menti, and inferiorly by the body of the hyoid bone.
External links
"Digastric muscle"