?:definition
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The posterior abdominal wall consists of the posterior abdominal wall musculature including the quadratus lumborum, psoas major and psoas minor and crus of lumbar part of diaphragm; the lumbar vertebrae bodies and transverse processes; the posterior part of abdominal peritoneum; and the abdominal wall including the transversus abdominus, internal and external oblique muscles posterior to the mid-axillary line. This definition is sometimes referred to as the posterior wall of abdomen proper as it excludes the more superficial layers of muscle and skin of the back: the middle layer of the thoracolumbar fascia (medially attached to the transverse process of the vertebra), and the lateral raphae constitute the posterior boundary of the posterior wall of abdomen and separate it from more caudal structures which are part of the lumbar region of back.
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