Splenius refers to a muscle in the human neck that connects the cervical vertebrae to the skull. There are several synonyms for the term splenius, including splenius cervicis and splenius capitis. These muscles also play an important role in the movement and stability of the head and neck. Other synonyms for splenius include suboccipital muscles, semispinalis muscles, and trapezius muscles. Understanding the various synonyms for splenius is important for healthcare professionals, therapists, and individuals who seek to improve their neck muscles' strength and flexibility. Regular exercise, stretching, and proper posture are key to maintaining healthy neck muscles and preventing injuries related to these muscles.