Digastric muscle

Digastric muscle
Muscles of the neck. Lateral view.
Front view of neck.
Latin	musculus digastricus
Gray's	subject #112 391
Origin	anterior belly - digastric fossa (mandible); posterior belly - mastoid process of temporal bone
Insertion	Intermediate tendon (hyoid bone)
Artery	anterior belly - Submental branch of facial artery; posterior belly - occipital artery
Nerve	anterior belly - mandibular division (V3) of the trigeminal (CN V) via the mylohyoid nerve; posterior belly - facial nerve (CN VII)
Actions	Opens the jaw when the masseter and the temporalis are relaxed.

The digastric muscle (also digastricus) (named digastric as it has two bellies) is a small muscle located under the jaw.

It lies below the body of the mandible, and extends, in a curved form, from the mastoid process to the symphysis menti. It belongs to the suprahyoid muscles group.

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.

Structure

The digastricus (digastric muscle) consists of two fleshy bellies united by an intermediate rounded tendon.

The two bellies of the digastric muscle have different embryological origins, and are supplied by different cranial nerves.

Posterior belly

The posterior belly, longer than the anterior belly, arises on the inferior surface of the skull, from the mastoid notch on 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 posterior belly is supplied by the digastric branch of facial nerve.

The digastric muscle stretches between the mastoid process of the cranium to the mandible at the chin, and part-way between, it becomes a tendon which passes through a tendinous pulley attached to the hyoid bone. It originates from the second pharyngeal arch.

Anterior belly

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 anterior body is supplied by the trigeminal via the mylohyoid nerve, a branch of the inferior alveolar nerve, itself a branch of the mandibular division of the trigeminal nerve. It originates from the first pharyngeal arch.

Intermediate tendon

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.

Action

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).

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.

Anterior view of digastric muscle

Triangles

The Digastricus divides the anterior triangle of the neck into three smaller triangles.

• (1) the submandibular triangle(also called Digastric 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.

Additional images

• 

  Mandible. Inner surface. Side view.

• 

  Hyoid bone. Anterior surface. Enlarged.

• 

  Base of skull. Inferior surface.

• 

  Superficial dissection of the right side of the neck, showing the carotid and subclavian arteries.

• 

  The triangles of the neck.

• 

  The veins of the neck, viewed from in front.

• 

  Distribution of the maxillary and mandibular nerves, and the submaxillary ganglion.

External links

• -664076211 at GPnotebook
• LUC dig
• Frontal section
• SUNY Figs 34:02-02
• SUNY Labs 24:17-0101
• Roche Lexicon - illustrated navigator, at Elsevier 25420.000-1

This article was originally based on an entry from a public domain edition of Gray's Anatomy. As such, some of the information contained within it may be outdated.