Origin - where a tendon attaches the muscle to a less movable bone Flexor muscles bend the joints, while extensor muscles straighten them.Įvery skeletal muscle has three main parts: the origin, insertion, and belly.
Tightening and relaxing the skeletal muscles creates movement. The myocardium, the specialized muscle of the heart smooth muscle that make up the walls of the intestines, stomach, etc. There are three different types of muscles in the body. Certain back muscles extend to other areas, like the ribs, shoulder, shoulder blade ( scapula), upper arm ( humerus), and thigh ( femur). Other muscles are small and cover much less space.
Some of these muscles are quite large and cover broad areas, e.g. Your back muscles extend from the bones of your neck ( cervical vertebrae) to your lower back (lumbar spine) and then to the base of your lumbar spine ( sacrum) and tailbone ( coccyx). The fascia covers and supports the muscles The muscles support the spine and allow for motion. Tendons attach the muscles to the vertebrae Nerves extend through small holes in the vertebrae to different parts of the body The transversospinal muscle group is small, deep muscles that attach between the spinous processes of one vertebra to the transverse processes of the vertebra below it.īetween the vertebra, discs provide cushioning transverse process, spinous process) where the muscles attach. Each of them (except the top vertebra of the neck) has a central part ( body), circular area ( vertebral arch), and small projections (e.g. The vertebrae are different depending on the level of the spine. The spine is made up of small bones called vertebrae. Each of these parts are individual structures, which function or work together. It is made up of the spine, discs, nerves, muscles, tendons, ligaments, fasciae, and other structures. The Back’s Structure The back’s structure is complex.
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