Which infrahyoid muscle does not attach to the hyoid bone?

The infrahyoid muscle that does not attach to the hyoid bone is the sternothyroid. This muscle is located in the neck and plays a role in depressing the thyroid cartilage. Unlike the other infrahyoid muscles, which directly connect to the hyoid bone to assist in its movement and stabilization, the sternothyroid originates from the sternum and extends upward to insert onto the thyroid cartilage. Understanding the anatomical relationships of these muscles is crucial for grasping their functions related to swallowing and speech, as well as their involvement in overall neck movement.