BIOL 2160 Chapter : Muscle
Document Summary
Bilateral contraction flexes head and elevates 1st and 2nd ribs during deep inspiration. Unilateral contraction laterally flexes head and rotates head to opposite sides (saying no) compresses abdomen and stabilizes trunk anterior fibers flex and medially rotate arm lateral fibers abduct arm posterior fibers extend and laterally rotate arm. Perineal body (and midline raphe over corpus spongiosum in male) Outer surface of ilium behind posterior gluteal line and posterior third of iliac crest lumbar fascia, lateral mass of sacrum, sacrotuberous ligament and coccyx. Lateral head: posterior surface of lateral condyle of femur and highest of three facets on lateral condyle. medial head: posterior surface of femur above medial condyle. Lateral supracondylar ridge of femur above lateral head of gastrocnemius. Aids mastication, tenses cheeks in blowing and whistling, aids closure of mouth. Elevates and wrinkles skin of chin and protrudes lower lip. Subclavian groove on inferior surface of middle third of clavicle.
