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).
In total, there are 33 vertebrae in the spinal column: 1  Cervical region (neck) â 7 vertebrae, abbreviated C1 through C7. 2  Thoracic region (middle back) â 12 vertebrae, abbreviated T1 through T12. 3  Lumbar region (low back) â 5 or 6 vertebrae, abbreviated L1 through L5 or L6. 4  Sacral region (pelvis) â 5 fused vertebrae, abbreviated S1 through S5.