ANTERIOR ABDOMINAL WALL RECTUS SHEATH UNDER THE FOLLOWING HEADINGS:FORMATIONS AT DIFFERENT LEVELS,CONTENTS, APPLIED ANATOMY(LE) Rectus sheath is an aponeurotic sheath covering the rectus abdominis muscle It has 2 walls- anterior and posterior. Anterior wall- completely covers the muscle from end to end. It is firmly adherent to tendinous intersections of the rectus muscle Posterior wall – is incomplete, being deficient above the costal margin and below the arcuate line It is free from the rectus muscle Formation Above the costal margin: Anterior wall- external oblique aponeurosis Posterior wall- deficient, rectus muscle rests on 5 th ,6 th , 7 th costal cartilages. Between the costal margin and arcuate line Anterior wall- external oblique aponeurosis Anterior lamina of internal oblique aponeurosis Posterior wall- posterior lamina of internal obl
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