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The sternothyroid muscle (or sternothyroideus) is an infrahyoid muscle of the neck. [1] ... (inferior to the origin of the sternohyoid muscle), ...
The sternohyoid muscle is a bilaterally paired, [1] long, [1] thin, [1] [2] narrow strap muscle [2] of the anterior neck. [1] It is one of the infrahyoid muscles. It is innervated by the ansa cervicalis. It acts to depress the hyoid bone. The sternohyoid muscle is a flat muscle located on both sides of the neck, part of the infrahyoid muscle group.
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.
Sternohyoid, omohyoid, sternothyroid are supplied by ansa cervicalis. Thyrohyoid: by a branch of hypoglossal nerve but the fibres are all 'hitch-hiking' from C1.
Beneath these superficial structures are the sternohyoid and sternothyroid, which, together with the anterior margin of the sternocleidomastoid, conceal the lower part of the common carotid artery.
Branches of the ansa cervicalis innervate three of the four infrahyoid muscles: the sternothyroid, sternohyoid, and omohyoid muscles (note that the thyrohyoid muscle is the one infrahyoid muscle not innervated by the ansa cervicalis - it is instead innervated by cervical spinal nerve 1 via a separate thyrohyoid branch [2]: 582, 600 ).
It contains the stylohyoid, digastric, mylohyoid, geniohyoid, omohyoid, sternohyoid, thyrohyoid and sternothyroid muscles. These muscles are grouped as the suprahyoid and infrahyoid muscles depending on if they are located superiorly or inferiorly to the hyoid bone. The suprahyoid muscles (stylohyoid, digastric, mylohyoid, geniohyoid) elevate ...
[3] [4] [verification needed] Its superior belly serves as the most lateral member of the infrahyoid muscles, located lateral to both the sternothyroid muscles and the thyrohyoid muscles. [5] [verification needed] The tendon is related to the internal jugular vein and can be used as a landmark for this vein during surgery. [citation needed]