Infrahyoid muscles

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Infrahyoid muscles
Infrahyoid muscles.png
Muscles of the neck seen from the front. The infrahyoid muscles are coloured in violet.
LatinMusculi infrahyoidei
Gray'sp.393
NerveAnsa cervicalis
ActionsDepress the hyoid bone
Anatomical terms of muscle
 
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Infrahyoid muscles
Infrahyoid muscles.png
Muscles of the neck seen from the front. The infrahyoid muscles are coloured in violet.
LatinMusculi infrahyoidei
Gray'sp.393
NerveAnsa cervicalis
ActionsDepress 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 infrahyoid muscles either originates from or insert on to the hyoid bone.

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.

Individual muscles[edit]

The origin, insertion and innervation of the individual muscles:[1]

MuscleOriginInsertionInnervation
sternohyoidposterior surface of manubrium sterni, adjoining parts of clavicle and the posterior sternoclavicular ligamentmedial part of lower border of hyoid boneansa cervicalis
sternothyroidposterior surface of manubrium sterni and adjoining part of first costal cartilageoblique line of thyroid cartilageansa cervicalis
thyrohyoidoblique line of thyroid cartilagelower border of the body and the greater cornu of the hyoid bonecervical spinal nerve 1 via the hypoglossal nerve
omohyoid (superior belly)intermediate tendonhyoid boneC1; superior root of ansa cervicalis
omohyoid (inferior belly)superior border of scapulaintermediate tendonC1-C3; ansa cervicalis

Innervation[edit]

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 fibres only from the first cervical spinal nerve travelling with the hypoglossal nerve.

Action[edit]

The infrahyoid muscles function to depress the hyoid bone and larynx during swallowing and speech.

See also[edit]

References[edit]

  1. ^ Ellis, Harold; Susan Standring; Gray, Henry David (2005). Gray's anatomy: the anatomical basis of clinical practice. St. Louis, Mo: Elsevier Churchill Livingstone. pp. 538–539. ISBN 0-443-07168-3.