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Omohyoideus
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Side of neck, showing chief surface markings
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Ansa Cervicalis
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The is a
Muscle at the front of the
Neck that consists of two bellies separated by an intermediate
Tendon .
The superior belly of omohyoid runs downwards from the
Hyoid Bone , narrows to the intermediate tendon and passes through a connective tissue sling (located on the
Clavicle ). The inferior belly continues laterally from the intermediate tendon, and is attached to the upper border of the
Scapula .
The Omohyoideus (Omohyoid muscle) consists of two fleshy bellies united by a central tendon. It arises from the upper border of the
Scapula , and occasionally from the
Superior Transverse Ligament which crosses the
Scapular Notch , its extent of attachment to the scapula varying from a few millimetres to 2.5 cm.
From this origin, the inferior belly forms a flat, narrow
Fasciculus , which inclines forward and slightly upward across the lower part of the neck, being bound down to the clavicle by a fibrous expansion; it then passes behind the
Sternocleidomastoideus , becomes tendinous and changes its direction, forming an obtuse angle.
It ends in the superior belly, which passes almost vertically upward, close to the lateral border of the
Sternohyoideus , to be inserted into the lower border of the body of the
Hyoid Bone , lateral to the insertion of the Sternohyoideus.
The central tendon of this muscle varies much in length and form, and is held in position by a process of the deep cervical fascia, which sheaths it, and is prolonged down to be attached to the
Clavicle and first rib; it is by this means that the angular form of the muscle is maintained.
The inferior belly of the Omohyoideus divides the posterior triangle of the neck into an upper or occipital triangle and a lower or subclavian triangle, while its superior belly divides the anterior triangle into an upper or carotid triangle and a lower or muscular triangle.
Doubling; absence; origin from clavicle; absence or doubling of either belly.
The omohyoid is innervated by a branch of the
Cervical Plexus , and mostly acts to stabilise the hyoid bone.
