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Muscles of the neck seen from the front. The infrahyoid muscles are coloured in violet.
|Actions||Depress the hyoid bone|
|Anatomical terms of muscle|
The infrahyoid muscles (strap muscles) are a group of four pairs of muscles in the anterior (frontal) part of the neck. The four infrahyoid muscles are; the sternohyoid, sternothyroid, thyrohyoid and omohyoid muscles.
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, but is not an infrahyoid muscle.
|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)|
All of the infrahyoid muscles are innervated by the ansa cervicalis from the cervical plexus (C1-C3) except the thyrohyoid muscle, which is innervated by fibers only from the first cervical spinal nerve travelling with the hypoglossal nerve.