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Infrahyoid muscles
Group of muscles From Wikipedia, the free encyclopedia
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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]
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.
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Individual muscles
The origin, insertion and innervation of the individual muscles:[3]
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]
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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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