An Accessory Muscle Originating From the Hyoid Bone and Inserting Into the Sternocleidomastoid Muscle

Irregular bellies and insertions into neck muscles have been described in the literature. To the best of our knowledge, a right accessory muscle originating from the hyoid bone and inserting into the sternocleidomastoid muscle has not been reported to date. Here, we report the case of a 72-year-old male patient with an irregular muscle originating from the lesser horn of the hyoid bone and inserting into sternocleidomastoid muscle fibers.