The omohyoid is a muscle of the neck.
Lateral neck dissection including omohyoid
|Function:||Depresses hyoid bone and larynx|
|Origin:||Upper border of scapula|
|Innervation:||Ansa cervicalis (C1 - C3)|
|Search for Omohyoid in Gray's.|
The omohyoid consists of two separate bellies of muscle which are united by a central tendon.
From its origin, the inferior belly forms a narrow fascicle which travels medially and slightly superiorly, bound to the clavicle by a fibrous expansion. It passes behind sternocleidomastoid, where it becomes tendinous and bends sharply superiorly.
The central tendon begins posteriorly posterior to sternocleidomastoid. It is held in place by a sheath of the deep cervical fascia, which is attached to the clavicle and first rib. The tendon ends in the superior belly.
The superior belly passes vertically, ascending the neck adjacent to the lateral border of sternohyoid and inserting just lateral to its insertion.
- Upper border of the scapula
- The inferior belly splits the posterior triangle into the upper occipital triangle and lower subclavian triangle
- The superior belly splits the anterior triangle into the upper carotid triangle and lower muscular triangle