Breast-and-hyoid muscle
Breast-hyoid muscle, m. Sternohyoideus, thin, flat, starts from the posterior surface of the clavicle, the joint capsule of the sternoclavicular joint and the sternum arm. Going upwards, it reaches the body of the hyoid bone, where it is attached below m. Mylohyoidei. In this place between the muscle and bone are located behind the sublingual bag, bursa retrohyoidea, and a sub-lingual bag, bursa infrahyoidea. Sometimes in the muscle there are 1-2 transversely extending tendon bridges, intersectiones tendineae.
Function: pulls the hyoid bone downwards.
Innervation: radix superior ansae cervicalis (CI-CIII).
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