Now, on the posterior side, you find, as well, another line, letâs say, but this time called the intertrochanteric crest that is also between the neck of the femur and the shaft and runs, as well, from the greater trochanter all the way down to the lesser trochanter.
The upper back has the most structural support, with the ribs attached firmly to each level of the thoracic spine and very limited movement. The lower back (lumbar vertebrae) allows for flexibility and movement in back bending (extension) and forward bending (flexion).
Anatomy of the tailbone. The tailbone is the last of five regions of the spine â below the cervical (upper) spine, thoracic (middle) spine, lumbar (lower) spine and the sacrum, which attached to the hips. The tailbone connects to the sacrum via a cartilaginous joint, which is similar in composition to the spineâs discs.