Hyoid Group

Joe Muscolino

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There are four Infrahyoid muscles and four Suprahyoid muscles:

Infrahyoids: sternohyoid, sternothyroid, thyrohyoid, omohyoid

Suprahyoids: Digastric, stylohyoid, mylohyoid, geniohyoid

 

ATTACHMENTS:

Most of the attachments of the hyoids are indicated in their names:

  • As a group, the infrahyoids attach superiorly into the hyoid bone.
  • As a group, the suprahyoids attach inferiorly into the hyoid bone and superiorly into the mandible.
  • Note: The sternothyroid does not directly attach into the hyoid bone; and the stylohyoid does not attach into the mandible.
  • Note: there are two bellies to the omohyoid and two bellies to the digastric.

 

ACTIONS:

  • As a group, the infrahyoids depress the hyoid bone and assist in flexing the neck at the spinal joints.
  • As a group, the suprahyoids elevate the hyoid bone and assist in flexing the neck at the spinal joints.
  • The digastric, mylohyoid, and geniohyoid also depress the mandible at the temporomandibular joints.