Spleen Anatomy Tutorials

Region: Abdomen

Descending Aorta

Descending Aorta The structure indicated is the descending aorta. The aorta consist of the ascending aorta, the aortic arch, and the descending aorta. The descending aorta is the largest artery in the human body and consists of a thoracic part and an abdominal part. The descending aorta passes through the aortic hiatus of the diaphragm together with the azygos vein and thoracic duct to enter the abdominal cavity where it is then referred to as the abdominal aorta. The abdominal aorta terminates by dividing at the aortic bifurcation into the common iliac arteries at the level of the fourth lumbar …

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descending aorta

Left Gastric Artery

Left Gastric Artery The structure indicated is the left gastric artery. The left gastric artery is one of three branches of the celiac trunk. The celiac trunk is the first anterior branch that arises from the abdominal aorta. The abdominal aorta consists of anterior, posterior, and lateral branches. There are three anterior branches which supply the foregut, midgut and hindgut structures these are as follows: Celiac trunk – supplies foregut Superior mesenteric artery – supplies midgut Inferior mesenteric artery – supplies hindgut The celiac trunk arises from the abdominal aorta at the level of the upper part of the first …

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left gastric artery

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

Left Gonadal Vein

Left Gonadal Vein The structure indicated is the left gonadal vein. The gonadal veins are the veins which drain the testes in men (testicular vein) and the ovaries (ovarian vein) in women.  The left gonadal vein drains into the left renal vein, which then drains into the inferior vena cava. The right gonadal vein however, drains directly into the inferior vena cava. The inferior vena cava is responsible for carrying deoxygenated blood into the right atrium of the heart from the lower part of the body. The inferior vena cava is formed at the point of union of the right …

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left gonadal vein

Lumbar Veins

Lumbar Veins The lumbar veins are illustrated in this diagram. The lumbar veins run along the posterior abdominal wall and drain into the inferior vena cava. In addition some lumbar veins drain into the iliolumbar vein, and into ascending lumbar veins. There are several veins which drain into the inferior vena cava. The inferior cava is formed from the union of the common iliac veins, which receive blood from the pelvis and lower limbs. Draining directly into the inferior vena cava, are the following veins: Lumbar veins Right gonadal veins (ovarian/testicular) Renal veins Right suprarenal vein Inferior phrenic veins Hepatic …

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Lumbar veins