Infrahyoid muscles: Difference between revisions
Adamlankford (talk | contribs) No edit summary |
Adamlankford (talk | contribs) →Individual muscles: All of my edits have made the table include "Innervation" and differentiated between superior and inferior bellies of omohyoid. Also added reference for the table. |
||
| Line 32: | Line 32: | ||
| [[sternohyoid muscle|sternohyoid]] || [[sternum]] || [[hyoid bone]] || [[ansa cervicalis]] |
| [[sternohyoid muscle|sternohyoid]] || [[sternum]] || [[hyoid bone]] || [[ansa cervicalis]] |
||
|- |
|- |
||
| [[thyrohyoid muscle|thyrohyoid]] || [[thyroid cartilage]] || [[hyoid bone]] || [[Cervical spinal nerve 1|C1]] (via [[hypoglossal nerve|CN XII]] |
| [[thyrohyoid muscle|thyrohyoid]] || [[thyroid cartilage]] || [[hyoid bone]] || [[Cervical spinal nerve 1|C1]] (via [[hypoglossal nerve|CN XII)]] |
||
|- |
|- |
||
| [[omohyoid muscle|omohyoid (superior belly)]] || intermediate tendon || [[hyoid bone]] || [[superior root of ansa cervicalis]] |
| [[omohyoid muscle|omohyoid (superior belly)]] || intermediate tendon || [[hyoid bone]] || [[superior root of ansa cervicalis]] |
||
Revision as of 20:24, 2 June 2010
 |
| Infrahyoid muscles | |
|---|---|
 Muscles of the neck. Anterior view. Hyoid bone is white horizontal line near top. Infrahyoid muscles are below hyoid, while Suprahyoid muscles are above. "Sterno-hyoideus" is at center right. "Omo-hyoideus" is immediately to the right of the Sterno-hyoideus. "Thyro-hyoideus" is to the right of omo-hyoideus, across from thyroid cartilage. "Sterno-thyreoidus" is at left, below thyro-hyoideus. | |
| Details | |
| Nerve | ansa cervicalis |
| Actions | depress hyoid bone |
| Identifiers | |
| Latin | musculi infrahyoidei |
| TA98 | A04.2.04.001 |
| TA2 | 2167 |
| FMA | 71298 |
| Anatomical terms of muscle | |
The infrahyoid muscles are a group of four pairs of muscles in the anterior part of the neck. (The term infrahyoid refers to the region below (inferior) to the hyoid bone in the neck. )
Collectively, they are referred to as the strap muscles, because the muscles are long and flat much like a strap.
Individual muscles
Namely, the muscles are:[1]
| Muscle | Origin | Insertion | Innervation |
| sternothyroid | sternum | thyroid cartilage | ansa cervicalis |
| sternohyoid | sternum | hyoid bone | ansa cervicalis |
| thyrohyoid | thyroid cartilage | hyoid bone | C1 (via CN XII) |
| omohyoid (superior belly) | intermediate tendon | hyoid bone | superior root of ansa cervicalis |
| omohyoid (inferior belly) | superior border of scapula | intermediate tendon | ansa cervicalis |
Innervation
All of the infrahyoid muscles are innervated by ansa cervicalis from the cervical plexus(C1-3) EXCEPT for the thyrohyoid muscle, which is innervated by only C1.
The stylopharyngeus muscle is considered by many to be one of the strap muscles, but it is innervated by CN IX rather than the ansa cervicalis.
Action
These four muscles, also known as the "strap" muscles, function to depress the hyoid bone and larynx during swallowing and speaking.
See also
References
 | This muscle article is a stub. You can help Wikipedia by expanding it. |