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Core of Body • The body's core muscles are the foundation for all other movement. The muscles of the torso stabilize the spine and provide a solid foundation for movement in the extremities. • These core muscles lie deep within the torso. They generally attach to the spine, pelvis and muscles that support the scapula. • When these muscles contract, we stabilize the spine, pelvis and shoulders and create a solid base of support. We are then able to generate powerful movements of the extremities. • Many people will naturally have an imbalance between the strength of their abdominal muscles and the lower back muscles. • Origin – the muscular attachment on the non-moving bone • Insertion – the muscular attachment on the moving bone • All muscles are controlled by nerves [innervation] • All muscles have a good blood supply PIRIFORMIS • from Latin piriformis = "pear shaped") • flat muscle, pyramidal in shape, lying almost parallel with the posterior margin of the Gluteus medius • Origin: anterior sacrum • Insertion: superior border of the greater trochanter of femur • Laterally rotates and abducts thigh @ hip jt Sacrum: pelvic surface. (Attachment for Piriformis identified as red outline at bottom right.) "Barry Bonds still has not responded to rumors of steroid use..." April 2004