Infrahyoid muscles
Group of muscles From Wikipedia, the free encyclopedia
The infrahyoid muscles, or strap muscles, are a group of four pairs of muscles in the anterior (frontal) part of the neck.[1] The four infrahyoid muscles are the sternohyoid, sternothyroid, thyrohyoid and omohyoid muscles.[1]
| Infrahyoid muscles | |
|---|---|
Muscles of the neck seen from the front. The infrahyoid muscles are coloured in violet. | |
| Details | |
| Nerve | Ansa cervicalis (except thyrohyoid muscle) |
| Actions | Depress the hyoid bone |
| Identifiers | |
| Latin | musculi infrahyoidei |
| TA98 | A04.2.04.001 |
| TA2 | 2167 |
| FMA | 71298 |
| Anatomical terms of muscle | |
Excluding the sternothyroid, the infrahyoid muscles either originate from or insert on to the hyoid bone.[2]
The term infrahyoid refers to the region below the hyoid bone, while the term strap muscles refers to the long and flat muscle shapes which resembles a strap. The stylopharyngeus muscle is considered by many to be one of the strap muscles,[citation needed] but is not an infrahyoid muscle.
Individual muscles
The origin, insertion and innervation of the individual muscles:[3]
| Muscle | Origin | Insertion | Innervation |
|---|---|---|---|
| Sternohyoid | Posterior surface of manubrium sterni, adjoining parts of clavicle and the posterior sternoclavicular ligament | Medial part of lower border of hyoid bone | Ansa cervicalis |
| Sternothyroid | Posterior surface of manubrium sterni and adjoining part of first costal cartilage | Oblique line of thyroid cartilage | Ansa cervicalis |
| Thyrohyoid | Oblique line of the thyroid cartilage | Lower border of the body and the greater cornu of the hyoid bone | Cervical spinal nerve 1 via the hypoglossal nerve |
| Omohyoid (superior belly) | Intermediate tendon | Hyoid bone | Superior root of ansa cervicalis (C1) |
| Omohyoid (inferior belly) | Superior border of scapula | Intermediate tendon | Ansa cervicalis (C1-C3) |
Nerve supply
All of the infrahyoid muscles are innervated by the ansa cervicalis from the cervical plexus (C1-C3)[4][5] except the thyrohyoid muscle, which is innervated by fibers only from the first cervical spinal nerve travelling with the hypoglossal nerve.[1]
Function
The infrahyoid muscles function to elevate and depress the hyoid bone and larynx during swallowing and speech.[6] This moves the larynx as one unit.[7]
See also
References
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