KP221 Lecture Notes - Lecture 20: Abdominal Wall, Rectus Sheath, Digastric Muscle
18 Jan 2018
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Document Summary
Thoracic and abdominopelvic cavities: thoracic = ribs, abdominal = ab muscles. Aponeurosis: cross-over fibers (originated from flat muscles) form aponeurosis. Important for structural integrity: allows expansion of abdominal cavity without many tears, superficial and deep fibers. Insertion = linea alba, pubic tubercle and anterior iliac crest (by ilium; area in between: action = assists in torsional rotation of trunk (bring ribs over and down, fleshy part = lateral wall, aponeuroses = anterior wall. Inferior border = inguinal ligament: line that divides lower limbs from trunk (like in barbie doll, digastric muscle involved in digestive system, helps during defecation and child labor, etc, breaking down of food. Insertion = linea alba and internal oblique aponeurosis, pubic crest and pectin pubis: fibers = transverse, circumferential orientation (cover cylinder-like ab. , compress contents of abdomen and increases intra-abdominal pressure, most fibers run transversally. Inferior fibers run parallel to internal oblique: shares a lot of connections/area with io.
