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The iliolumbar ligament strengthens the lumbosacral joint assisted by the lateral lumbosacral ligament, and, like all other vertebral joints, by the posterior and anterior longitudinal ligaments, the ligamenta flava, and the interspinous and supraspinous ligaments. [4] It reduces the range of movement of the lumbosacral joint. [6]
The iliolumbar artery is the first branch of the posterior trunk of the internal iliac artery. [1] 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
In individuals who are biological females, the ovarian artery (a branch of the abdominal aorta) and uterine arteries form anastomoses. [6] Right (distal from spectator) internal iliac artery and branches, except for iliolumbar artery, umbilical artery, uterine artery/deferential artery and vaginal artery/inferior vesical artery.
The superior, of large size, passes medialward, and, after anastomosing with branches from the middle sacral, enters the first or second anterior sacral foramen, supplies branches to the contents of the sacral canal, and, escaping by the corresponding posterior sacral foramen, is distributed to the skin and muscles on the dorsum of the sacrum, anastomosing with the superior gluteal.
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 canal to supply the bone, while others run along the crest of the ilium, distributing branches to the gluteal and abdominal muscles, and anastomosing in ...
The quadratus lumborum muscle originates by aponeurotic fibers into the iliolumbar ligament and the internal lip of the iliac crest for about 5 centimetres (2.0 in). It inserts from the lower border of the last rib for about half its length and by four small tendons from the apices of the transverse processes of the upper four lumbar vertebrae.
Compression of the left common iliac vein against the fifth lumbar vertebral body by the right common iliac artery as the artery crosses in front of it traditionally happens in May–Thurner syndrome. [5] Continuous pulsation of the common iliac artery may trigger an inflammatory response within the common iliac vein.
The iliolumbar vein is the vena comitans of the iliolumbar artery. The obturator nerve crosses superficial to it. [1] A single vein is found more commonly than a double vein. [2] It drains vertebral segments four and five. [3] It is closely related to the ascending lumbar vein. [3]