ANP 1106 Lecture Notes - Lecture 14: Central Tendon Of Diaphragm, Transverse Perineal Muscles, Iliac Crest

• School: University of Ottawa
• Department: Anatomy and Physiology
• Course: ANP 1106
• Professor: Jackie Carnegie

Document Summary

External oblique largest and most superficial fibers run down and medially. Origin by fleshy strips from outer surfaces of lower eight ribs insertion most fibers insert into linea alba via a broad aponeurosis, also insert into pubic crest and iliac crest. When it"s a pair they flex the vertebral column and compress abdominal wall increasing the intra abdominal pressure, also rotate trunk and flex laterally intercostal nerve supply. Muscles fan so inferior fibers run down and medially. Origin lumbar fascia, iliac crest and inguinal ligament. Broad thin tripartite muscle with 3 parts: pubococcygeus, puborectalis and iliococcygeus forms a muscular sling around anorectal junction. Origin extensive linear origin inside pelvis from pubis to ischial spine insertion inner surface of coccyx supports and maintains position of pelvic viscera, resists downward thrusts that accompany rises in intrapelvic pressure during coughing. Coccygeus small triangular muscle lying posterior to levator ani.