Respuesta :
The sacrum is joined to other parts of the pelvis by strong ligaments, forming the sacroiliac joint.
The sacrum is located in the upper posterior part of the pelvic cavity, between the wings of the pelvis. It forms joints with four other bones. The two projections on either side of the sacrum are called the ale (wings) and articulate with the ilium at the L-shaped sacral joint. The upper part of the sacrum joins the last lumbar vertebra (L5) and its lower part. with coccyx. (coccyx) through the horns of the sacrum and coccyx.
The sacrum has three different surfaces that are shaped to conform to the structures surrounding the pelvis. Overall, it is concave (curved on itself). The base of the sacrum, the widest and highest, slopes forward like the inner sacral process. The central part curves outward to the back, leaving more room for the pelvic cavity.
The sacral or SI joint (SIJ) is a joint between the sacrum and the pelvis of the pelvis, connected by strong ligaments. In humans, the sacrum supports the spine and is in turn supported by an ilium on each side. Strong joints, supporting the entire weight of the upper body. It is a flat synovial joint with uneven elevation and depression that creates interlocking of the two bones. The human body has two sacroiliac joints, one on the left and one on the right, which often correspond to each other but vary widely from person to person.
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