|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.
|Gray's||subject #112 393|
|Action:||depress hyoid bone|
Collectively, they are referred to as the strap muscles, because the muscles are long and flat much like a strap.
Namely, the muscles are:
|thyrohyoid||thyroid cartilage||hyoid bone|
|omohyoid||superior border of scapula||hyoid bone|
All of the infrahyoid muscles are innervated by the ansa cervicalis from the cervical plexus(C1-3) EXCEPT for the thyrohyoid muscle, which is innervated by only C1.
These four muscles also known as the "strap" muscles function is to depress the hyoid bone and larynx during swallowing and speaking