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The sacroiliac joint or SI joint (SIJ) is the joint between the sacrum and the ilium bones of the pelvis, which are connected by strong ligaments. In humans, the sacrum supports the spine and is supported in turn by an ilium on each side.
The posterior sacroiliac ligament is situated in a deep depression between the sacrum and ilium behind; it is strong and forms the chief bond of union between the bones. It consists of numerous fasciculi , which pass between the bones in various directions.
The common iliac artery is a large artery of the abdomen paired on each side. It originates from the aortic bifurcation at the level of the 4th lumbar vertebra.It ends in front of the sacroiliac joint, one on either side, and each bifurcates into the external and internal iliac arteries.
The sacrum (pl.: sacra or sacrums [1]), in human anatomy, is a large, triangular bone at the base of the spine that forms by the fusing of the sacral vertebrae (S1–S5) between ages 18 and 30. [2] The sacrum situates at the upper, back part of the pelvic cavity, between the two wings of the pelvis. It forms joints with four other bones.
Anatomy photo:43:12-0104 at the SUNY Downstate Medical Center - "The Female Pelvis: The External and Internal Iliac Vessels" Anatomy figure: 43:07-05 at Human Anatomy Online, SUNY Downstate Medical Center - "Sagittal view of the internal iliac artery and its branches in the female pelvis. "Anatomy image:8970 at the SUNY Downstate Medical Center
The dimples of Venus (also known as back dimples, Duffy Dimples, butt dimples or Veneral dimples) are sagittally symmetrical indentations sometimes visible on the human lower back, just superior to the gluteal cleft. They are directly superficial to the two sacroiliac joints, the sites where the sacrum attaches to the ilium of the pelvis. An ...
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Enhancement is seen at the right sacroiliac joint (arrow, left side of image), indicating active sacroiliitis. This patient had psoriatic arthritis. Sacroiliitis is a condition caused by inflammation within the sacroiliac joint. [1] This joint is located where the base of the spine, known as the sacrum, and the pelvis, known as the ilium ...