posterior abdominal wall

Quadratus Lumborum

Quadratus Lumborum The structure indicated is the quadratus lumborum muscle. The quadratus lumborum muscle is one of the muscles which makes up the posterior abdominal wall. There are four muscles which contribute to the posterior abdominal wall: Psoas major Psoas minor Quadratus lumborum Iliacus Origin: Transverse process of L5, iliolumbar ligament, iliac crest. Insertion: Transverse processes of L1-L4, inferior border of 12th rib Action: Depresses and stabilises 12th rib. Weak lateral flexion of trunk Innervation: Anterior rami of T12-L4 Learn more about the muscles of the posterior abdominal wall in this tutorial

quadratus lumborum

Renal Artery

Renal Artery The structure indicated is the right renal artery. The renal arteries are lateral branches of the abdominal aorta which arise at the level of the intervertebral disc between L1 and L2, just below the origin of the superior mesenteric arteries. There is one renal artery that supplies each kidney. The right renal artery tends to originate slightly lower than the left renal artery, and it passes behind the inferior vena cava to supply the right kidney. The renal arteries then divide into a few anterior and posterior branches at the hilum. The renal arteries can become narrowed, or …

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Right renal artery

Psoas Major

Psoas Major The structure indicated is the psoas major muscle The psoas major muscle is one of the muscles which makes up the posterior abdominal wall. There are four muscles which contribute to the posterior abdominal wall: Psoas major Psoas minor Quadratus lumborum Iliacus The iliacus muscle combines with the psoas major muscle to enter the anterior compartment of the thigh and insert via a common tendon on the lesser trochanter of the femur. The iliacus and the psoas major muscles are thus collectively referred to as the iliopsoas muscle – they act synergistically to flex the thigh at the …

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psoas major