Sternohyoid
From Ganfyd
The sternohyoid is a muscle of the neck.
| Sternohyoid | |
|---|---|
 Anterior neck dissection including the sternohyoid | |
| System: | Muscle |
| Function: | Depression of the hyoid bone and larynx |
| Origin: | Posterior medial clavicle, posterior sternoclavicular ligament, posterior superior manubrium |
| Branches: | |
| Insertion: | Inferior surface of hyoid bone |
| Arterial supply: | |
| Venous drainage: | |
| Lymphatic drainage: | |
| Innervation: | Ansa cervicalis (C1 - C3) |
| Vertebral levels: | |
| Search for Sternohyoid in Gray's. | |
Contents |
Shape
The sternohyoid arises from the superoposterior border of the manubrium, the posterior sternoclavicular ligament, and the posterior surface of the medial clavicle. It travels superomedially to insert through short tendonous fibres into the inferior border of the hyoid bone. The muscles of the two sides are some distance apart at their origins, but come together in the midline half way along their lengths, and insert adjacently.
Actions
- Depresses hyoid bone and hence the larynx
Origin
- Posterior border of the medial clavicle
- Posterior sternoclavicular ligament
- Superoposterior manubrium
Insertion
- Inferior surface of hyoid bone
Nerve Supply
- Ansa cervicalis (C1, C2, C3)
Variations
- Sometimes has a transverse tendon immediately above its origin joining the two parts
- May be doubled
- The clavicular origin may be a separate slip (the Cleidohyoid)
- May be absent
