👉 A tribrachic is a type of muscle in the human body that moves in three directions, or in other words, it's a combination of three different muscles. Tribrachic muscles are found primarily in the upper back and neck region, and they help to stabilize the spine, which is an important part of the body's overall stability. These muscles are involved in several functions, including supporting the vertebrae (spinal bones) that form the backbone of the body, regulating posture