SACRUM LOCATION METHODS AND CUN MEASUREMENTS скачать в хорошем качестве

SACRUM LOCATION METHODS AND CUN MEASUREMENTS

The sacrum is a single bone comprised of five separate vertebrae. It is shaped like an upside-down triangle and sits at the bottom of the spinal column, connecting it to the pelvis. This robust bone can endure a lot of pressure and motion. Along with the coccyx (tailbone), the sacrum provides a stable platform to help you sit upright. The sacrum is an irregular bone that makes up the back or posterior third of the pelvic girdle. A ridge across the front or anterior portion of the S1 vertebra is called the sacral promontory. There are small holes called foramen along both sides of the sacrum that are left over when individual vertebrae fuse together. Depending on how many sacral vertebrae there are, there can be three to five sacral foramen on each side, though there are usually four.3 Each anterior foramen is usually wider than the corresponding posterior or dorsal (on the backside) foramen. Each sacral foramina (plural of foramen) is a channel for the sacral nerves and blood vessels.