Spinal muscles, also known as paravertebral muscles, are a group of muscles located alongside the spine. They play a crucial role in supporting the vertebral column and maintaining posture. These muscles help facilitate movements such as bending, twisting, and extending the back, allowing for a range of motion in the torso. These muscles are divided into several layers, including the superficial, intermediate, and deep layers. Each layer consists of different muscle groups, such as the erector spinae and multifidus, which work together to stabilize the spine and protect it from injury during physical activities.