Tuesday, 13 January 2009
Muscle a day #2: Omohyoid
Revising the triangles of the neck at the weekend, I realised that I knew very little about omohyoid, an important muscle which defines some of the sub triangles of both the anterior and posterior traingles. So here's some more information:
This muscle is an infrahyoid muscle found in the anterior neck, deep to sternocleidomastoid.
Upper border of scapula and occasionally superior transverse scapular ligament (crossing scapular notch).
Lower border of hyoid bone, lateral to insertion of sternohyoid.
Ansa Cervicalis (C1-C3) (branch of cervical plexus)
Depresses, retracts, and steadies hyoid bone
The omohyoid has 2 bellies connected by a tendon and is one of the infrahyoid muscles. It passes anteriorly and superiorly from the scapula, passing behind sternoclediomastoid where it takes a steep redirection superiorly towards its attachment to the inferior hyoid.
The central tendon is attached to the first rib and clavicle by the deep cervical fascia.