Omohyoideus muscle
| Omohyoideus muscle |
|---|
|
| Neck muscles of the human from anteriorly |
| origin |
| Venter inferior: Margo superior of the scapula between the angulus superior and the incisura scapulae |
| approach |
| Venter superior: Caudal edge of the outer surface of the lateral section of the hyoid bone |
| function |
| Auxiliary muscle in the act of swallowing |
| Innervation |
| Ansa cervicalis profunda (plexus cervicalis) |
The musculus omohyoideus ( Greek Gr. - Latin for "shoulder-hyoid bone muscle") is a two- bellied skeletal muscle in humans , which is involved in the act of swallowing . The two bellies of the omohyoideus muscle are connected to one another by an intermediate tendon , which in turn radiates into the carotid sheath ( vagina carotica ). The lower abdomen of the omohyoideus muscle forms the lateral-head-facing border of the large upper clavicle fossa ( fossa supraclavicularis major , syn. Trigonum omoclaviculare ).
The omohyoideus muscle arises in humans with its lower abdomen ( venter inferior ) at the upper edge of the shoulder blade ( margo superior ) and has its insertion via the upper abdomen ( venter superior ) on the body of the hyoid bone ( os hyoideum ). The muscle , which is counted as the sub hyoid muscles because of its location, is innervated by the ansa cervicalis profunda , which comes from the plexus of the neck ( plexus cervicalis ).
function
The muscle fixes the hyoid bone and pulls it down. It serves as an auxiliary muscle in the act of swallowing and is involved in bending the head and neck joints. As it fuses with the carotid vagina, the muscle tightens the neck fascia as it contracts . This effect on the fascia ( lamina praetrachealis of the fascia colli ) keeps the internal jugular vein open against negative pressure , especially when the body is in an upright position .
Species specifics
In predators , the muscle is not developed. In the other mammals, the muscle is mostly not double-bellied. In horses it arises from the thoracolumbar fascia in the shoulder area, in ruminants from the deep cervical fascia in the area of the last cervical vertebrae. The approach takes place on the body of the hyoid bone.