Sternocephalicus muscle
| Sternocephalicus muscle |
|---|
| origin |
| Manubrium sterni |
| approach |
| skull |
| function |
| Pulling the head and neck sideways or down |
| Innervation |
| Ramus ventralis of the accessory nerve |
The sternocephalicus muscle ( Latin for "sternum-head-muscle") is a skeletal muscle of the neck in mammals with a rudimentary collarbone . In humans it is part of the sternocleidomastoid muscle . The muscle lies on the lower side of the lateral surface of the neck and forms the upper limit of the throttle groove .
It arises at the manubrium sterni and attaches - depending on the species - to the skull and is named accordingly. In some species, the muscle just before the head splits into two parts with different attachments:
- Pars mandibularis ("lower jaw part"): In horses it extends to the sternomandibular tuberosity on the branch of the lower jaw , in cattle and goats on the body of the lower jaw.
- Pars mastoidea ("wart part"): It attaches to the mastoid process ( processus mastoideus ) of the temporal bone and occurs in cloven-hoofed animals and predatory animals . In cattle and goats, the muscle therefore has two approaches.
- Pars occipitalis ("occipital part"): It is the second attachment in predators and extends to the occiput .
The sternocephalicus muscle pulls the head and neck to the side when contracting on one side, and down when contracting on both sides.
literature
- Franz-Viktor Salomon: muscle tissue. In: Anatomy for veterinary medicine. Enke, Stuttgart 2004, ISBN 3-8304-1007-7 , pp. 147-234.