Back muscles: Learn about the extrinsic and intrinsic muscles

Learn about the extrinsic and intrinsic muscles of the back , their attachments, innervation and actions. The extrinsic muscles are immigrant muscles of the upper limb that lie superficially on the back , while the intrinsic muscles are true back muscles that lie deep to the thoracolumbar fascia. The latissimus dorsi muscle is located in the rear of the central portion of the abdomen, behind the arm. The trapezius partially covers this muscle near the midline portion of the back and spine. It’s a long flat muscle that stretches from the spine to the side of the body. Learn about the names, locations, origins, insertions, actions, and innervations of the back muscles . The back muscles are divided into three layers: superficial, intermediate, and deep, and include the trapezius, latissimus dorsi, rhomboids, serratus posterior, and more. The back muscles play a vital role in providing stability, support, and movement for the spine, shoulders, and upper limbs. They are organized into layers that perform various functions, from powerful gross motor movements to fine, precise stabilization of the vertebrae. Understanding the structure of these muscles helps develop strength, improve posture, and prevent injuries. In this Muscle and Motion article, we will explore the different layers of the back muscles and their individual ...