Joe Muscolino

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Anterior and right lateral views of the digastric of the suprahyoid group. The digastric has two bellies: anterior belly and posterior belly. In the anterior view, the mylohyoid, stylohyoid, and sternohyoid (also of the suprahyoid group) have been ghosted in on the left side.

The Digastric is a member of the Suprahyoid Group, which is composed of the:

  • Digastric
  • Mylohyoid
  • Geniohyoid
  • Stylohyoid

The Digastric has two bellies: Posterior belly and Anterior belly. The two bellies are connected to each other by the Central Tendon (aka the Intermediate Tendon), which is attached to the hyoid bone by a fibrous sling of tissue.


  • The digastric attaches from the temporal bone to the hyoid bone to the mandible.
    • The posterior belly attaches from the temporal bone to the hyoid bone (via a fibrous sling of tissue).
    • The anterior belly attaches from the hyoid bone (via a fibrous sling of tissue) to the mandible.



  • Depresses of the mandible at the temporomandibular joints (TMJs).
  • Elevates the hyoid bone.
  • Flexes the neck at the spinal joints.
  • Extends the head at the atlanto-occipital joint.


NOTE: The digastric is the prime mover muscle of depression of the mandible at the TMJs.