axial muscle

The axial muscles are a division of the somatic musculature in vertebrates, distinct from the appendicular muscles. These muscles are primarily associated with the trunk, tail, and eyeballs, and include a group known as hypobranchial muscles.1

In tetrapods, the axial muscles play a crucial role in locomotion, particularly in amphibians like newts and salamanders, where they are the main propulsive force. In reptiles, these muscles become more complex, with divisions responsible for spinal rotation, extension, and lateral bending. Mammals retain a similar pattern but with reduced segmentation.2

The vertebral column, part of the axial skeleton, serves as an anchor for many muscles, including the erector spinae, which helps maintain an erect posture. These muscles are vital for supporting the body and enabling movement.345