The muscle-like tissue that sits in front of the neck bone (cervical vertebrae) is primarily the platysma muscle. The platysma is a thin, sheet-like muscle that extends from the chest and shoulder area up to the jawline. It is involved in facial expressions and helps to lower the jaw and tense the skin of the neck.
Additionally, there are other muscles in the neck region, such as the sternocleidomastoid and the infrahyoid muscles, which also play roles in movement and stability of the head and neck. If you were referencing a specific type of tissue or a specific function, please let me know for further clarification!