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The thyrohyoid muscle is a small, [1] broad and short muscle. [2] It is quadrilateral in shape. [1] It may be considered a superior-ward continuation of sternothyroid muscle. [1] It belongs to the infrahyoid muscles group and the outer laryngeal muscle group. [3]: 567–568
The sternothyroid muscle (or sternothyroideus) ... It may issue accessory slips to the thyrohyoid muscle, inferior pharyngeal constrictor muscle, or the carotid sheath.
Sternohyoid, omohyoid, sternothyroid are supplied by ansa cervicalis. Thyrohyoid: by a branch of hypoglossal nerve but the fibres are all 'hitch-hiking' from C1.
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 .
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 ).
Two muscles originate along the line, the thyrohyoid muscle and inferior pharyngeal constrictor. The sternothyroid inserts along the line. Thyroid cartilage. Movement of the cartilage at this joint produces a change in tension at the vocal folds, which in turn produces variation in voice.
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]
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