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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.
Sternohyoid, omohyoid, sternothyroid are supplied by ansa cervicalis. Thyrohyoid: by a branch of hypoglossal nerve but the fibres are all 'hitch-hiking' from C1. Development
The sternothyroid muscle (or sternothyroideus) is an infrahyoid muscle of the neck. [1] ... (inferior to the origin of the sternohyoid muscle), ...
The thyrohyoid muscle forms the inferior boundary of the carotid triangle. [5] It is situated deep to (beneath) the (depending upon the source) superior portion of [2] /superior belly of [3]: 538 the sternohyoid muscle, [2] [3]: 538 and the superior portion of [2] the omohyoid muscle. [2] [3]: 538
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 ...
The omohyoid muscle is a muscle in the neck. It is one of the infrahyoid muscles. It consists of two bellies separated by an intermediate tendon. Its inferior belly is attached to the scapula; its superior belly is attached to the hyoid bone. Its intermediate tendon is anchored to the clavicle and first rib by a fascial sling.
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 ).
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