Tuberosity Sacral

Tuberosity of the sacral region The sacrum is the spinal-pelvic section of the spine, consisting of five to six vertebrae. The rounded or wedge-shaped apex of the first sacral vertebra, together with the adjacent edge of the pelvis, forms the anteroposterior protrusion of the pelvic ring. On the lateral surfaces of the sacrum, on the sides of the convexity of the sacrum, there are large gluteal muscles that perform hip extension. Approximately halfway between the anterior superior iliac spine and the intergluteal line lies the border of the sacral fossa. On the sides of the tuberosity, which is formed by the end of the lower edge of the sacrum and the anterior edge of the acetabulum, the semitendinosus, semimembranosus, and biceps femoris muscles are attached. The apices of the T 5 and T 6 cruciate vertebrae in some cases may not be fused, and if they are fused, they have an uneven surface. The structure of the muscles in the sacral area is quite rough. It contains a large number of fascia. The arches S 1 – S 4 are sometimes equipped with bony protrusions in front and behind. All these special structures give the sacrum its special shape. But at the same time, the sacrum looks like several separate pieces that are firmly fused into one bone.

Sacral tuberosity The tuberosity, located on the upper surface of the sacrum, is usually clearly visible and oval in shape. Its dimensions vary between 70-82 mm. If you make a graphic drawing of your sacrum on your stomach, it will be presented in the form of a triangle into which a circle is inscribed. A pair of sacral tuberosities are connected through ligaments of intervertebral joints, forming a paired sacral coccygeal joint. The sacral coccygeal ligament is a bundle of fibers that forms the median groove in an adult, cut by the intercoccygeal canal. This groove runs from the intervertebral joint, located between S1 - S2, to the sacrococcygeal joint, located between the tuberous bone tissue. This type of sacrococcygeal ligament explains the impossibility of direct measurement of paired sacral tuberosities