enclose and protect abdominal contents while providing the flexibility required by respiration, posture, and locomotion. From pubic bone to linea alba Anterior rami of T12 O External surfaces of 5th-12th ribs I Linea alba Pubic tubercle Anterior half of iliac crest T7-T11 spinal nerves and subcostal nerve The lower border of the external oblique aponeurosis forms the inguinal ligament (Poupart’s ligament) thickened reinforced free edge of the external oblique aponeurosis between anterior superior iliac spine laterally and pubic tubercle medially. It folds under itself forming a trough, which plays an important role in the formation of the inguinal canal. from extensions of the fibers at the medial end of the inguinal ligament: lacunar ligament crescent-shaped extension of fibers at the medial end of the inguinal ligament pass backward attach to pecten pubis on the superior ramus of the pubic bone pectineal (Cooper's) ligament from the lacunar ligament along the pecten pubis of the pelvic brim Anterior rami of T6-T12 spinal nerves) and first lumbar nerves I Inferior borders of 10th-12th ribs Linea alba Pecten pubis via conjoint tendon O Thoracolumbar fascia Anterior 2/3 of iliac crest Connective tissue deep to lateral 1/3 of inguinal ligament Anterior rami of T6-T12 spinal nerves) and first lumbar nerves I Linea alba with aponeurosis of internal oblique Pubic crest Pecten pubis via conjoint tendon O Internal surfaces of 7th-12th costal cartilages Thoracolumbar fascia Iliac crest Connective tissue deep to lateral 1/3 of inguinal ligament O: Pubic symphysis Pubic crest I: Xp 5-7 costal cartilages Anterior rami of T6-T12 spinal nerves) and first lumbar nerves unique layering of the aponeuroses of the external and internal oblique, and transversus abdominis muscles Ant. + Post. of ¾ rectus abdominis closed. Post. of ¼ rectus abdominis closed. no sheath covers the posterior surface of the lower quarter of the rectus abdominis at this point is in direct contact with the transversalis fascia. Marking this point of transition is an arch of fibers (arcuate line). Rectus sheath anterior wall aponeurosis of external oblique& halfof aponeurosis of internaloblique, splits at lateralmarginof rectusabdominis posterior wall otherhalfof aponeurosisof internaloblique & aponeurosis of transversus abdominis FUNCTIONS AND ACTIONS OF ANTEROLATERAL ABDOMINAL MUSCLES Form a strong expandable support for the anterolateral abdominal wall. Support the abdominal viscera and protect them from most injuries. Compress the abdominal contents to maintain or increase the intra-abdominal pressure and, in so doing, oppose the diaphragm (increased intra-abdominal pressure facilitates expulsion). Move the trunk and help to maintain posture. Rectus abdominis is a powerful flexor of the thoracic and especially lumbar regions of the vertebral column. The oblique abdominal muscles also assist in movements of the trunk, especially lateral flexion and rotation of the lumbar and lower thoracic vertebral column. quiet and forced expiration by pushing the viscera upward (helps push the relaxed diaphragm further into the thoracic cavity) coughing vomiting sneezing eructation screaming parturition micturition defecation flatus Femoral nerve fills the iliac fossa on each side. chief flexor of the thigh Lesser troachanter of femur fill the space between ribs XII and the iliac crest on both sides of the vertebral column. I Transverse process of first four lumbar vertebrae and the inferior border of rib XII O Transverse process of L5, Iliolumbar ligament, iliac crest Depress and stabilize 12th ribs Lateral bending of the trunk. Acting together, extend lumbar part of the spine. anterior rami of T12 and L1 to L4 spinal nerves http://www.getbodysmart.com The superficial fatty layer of superficial fascia (Camper's fascia) continuousovertheinguinalligament withthesuperficial fasciaof thethighandwitha similarlayerin theperineum. Inmen, continues overthepenis and, fusingwiththedeeperlayerof superficialfascia, continuesinto thescrotumspecializedfasciallayercontainingsmoothmusclefibers(thedartosfascia). Inwomen, retains somefatandis a componentof thelabiamajora. The deeper membranous layer of superficial fascia (Scarpa's fascia) thin and membranous contains little or no fat. Inferiorly, continues into the thigh, just below the inguinal ligament, fuses with deep fascia of the thigh (the fascia lata). In the midline, firmly attached to the linea alba & symphysis pubis. continues into the anterior part of the perineum where it is firmly attached to the ischiopubic rami and to the posterior margin of the perineal membrane. Here, referred to as superficial perineal fascia (Colles' fascia).