Iliolumbar Vein

	Iliolumbar Vein The iliolumbar vein is the vena comitans of the iliolumbar artery. The obturator nerve crosses superficial to it. A single vein is found more commonly than a double vein. It drains vertebral segments four and five. It is closely related to the ascending lumbar vein The ascending lumbar vein is a vein that runs up through the lumbar region on the side of the vertebral column. Structure The ascending lumbar vein is a paired structure (i.e. one each for the right and left sides of the body). It starts at the c .... References External links Veins of the torso {{circulatory-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]
	Iliolumbar Artery The iliolumbar artery is the first branch of the posterior trunk of the internal iliac artery. Structure The iliolumbar artery is the first branch of the posterior trunk of the internal iliac artery. It turns upward behind the obturator nerve and the external iliac artery and vein, to the medial border of the psoas major muscle, behind which it divides into: * Lumbar branch of iliolumbar artery * Iliac branch of iliolumbar artery The iliac branch of the iliolumbar artery (ramus iliacus) descends to supply the iliacus muscle; some offsets, running between the muscle and the bone, anastomose with the iliac branches of the obturator artery; one of these enters an oblique ca ... Anastomoses 1. Last lumbar→iliolumbar 2. Lateral sacral↔lateral sacral 3. Middle sacral→lateral sacral 4. Superior hemorrhoidal→middle hemorrhoidal 5. Medial femoral circumflex→inferior gluteal 6. Medial femoral circumflex↔obturator 7. Lateral femoral circumflex→superior gluteal 8. Dee ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]
	Vena Comitans Vena comitans is Latin for accompanying vein. It refers to a vein that is usually paired, with both veins lying on the sides of an artery. They are found in close proximity to arteries so that the pulsations of the artery aid venous return. Because they are generally found in pairs, they are often referred to by their plural form: venae comitantes. Venae comitantes are usually found with certain smaller arteries, especially those in the extremities. Larger arteries, on the other hand, generally do not have venae comitantes. They usually have a single, similarly sized vein which is not as intimately associated with the artery. Examples of arteries and their venae comitantes: * Radial artery and radial veins * Ulnar artery and ulnar veins * Brachial artery and brachial veins * Anterior tibial artery and anterior tibial veins * Posterior tibial artery and Posterior tibial veins * Fibular artery and Fibular veins Examples of arteries that do not have venae comitantes (i.e. thos ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]
	Obturator Nerve The obturator nerve in human anatomy arises from the ventral divisions of the second, third, and fourth lumbar nerves in the lumbar plexus; the branch from the third is the largest, while that from the second is often very small. Structure The obturator nerve originates from the anterior divisions of the L2, L3, and L4 spinal nerve roots. It descends through the fibers of the psoas major, and emerges from its medial border near the brim of the pelvis. It then passes behind the common iliac arteries, and on the lateral side of the internal iliac artery and vein, and runs along the lateral wall of the lesser pelvis, above and in front of the obturator vessels, to the upper part of the obturator foramen. Here it enters the thigh, through the obturator canal, and divides into an anterior and a posterior branch, which are separated at first by some of the fibers of the obturator externus, and lower down by the adductor brevis. An accessory obturator nerve may be present in approx ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]
	Ascending Lumbar Vein The ascending lumbar vein is a vein that runs up through the lumbar region on the side of the vertebral column. Structure The ascending lumbar vein is a paired structure (i.e. one each for the right and left sides of the body). It starts at the common iliac veins. It runs superiorly, intersecting with the lumbar veins as it crosses them. It passes behind the psoas major muscle, but in front of the lumbar vertebrae. When the ascending lumbar vein crosses the subcostal vein, it becomes one of the following: * the azygos vein (in the case of the ''right'' ascending lumbar vein). * the hemiazygos vein (in the case of the ''left'' ascending lumbar vein). # The first and second lumbar veins ends in the ascending lumbar vein(the third and fourth lumbar veins open into the posterior aspect of the inferior vena cava) Clinical significance Contrast medium may be injected into the ascending lumbar vein via the femoral vein in order to visualise the spinal canal. The ascending lumbar vei ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]