| 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. |
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| Latin | musculi infrahyoidei |
| Gray's | subject #112 393 |
| Origin | |
| Insertion | |
| Artery | |
| Nerve | ansa cervicalis |
| Actions | depress hyoid bone |
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.
Contents |
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 |
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.
These four muscles, also known as the "strap" muscles, function to depress the hyoid bone and larynx during swallowing and speaking (except for Thyrohyoid).
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