The Iliocostalis Cervicis is a muscle located in the back, part of the larger group known as the erector spinae. It runs from the upper ribs to the cervical vertebrae, specifically the C4 to C6 levels. This muscle plays a crucial role in supporting the spine and facilitating movement. Functionally, the Iliocostalis Cervicis helps in extending and laterally flexing the neck. It works alongside other muscles in the erector spinae group to maintain posture and assist in various movements of the upper body. Proper functioning of this muscle is essential for overall spinal health.