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).
Sections of the spine. The 33 vertebrae are stacked within four regions of the spine: 1  Cervical (neck) â seven vertebrae, labeled C1 through C7. 2  Thoracic (mid-back) â 12 vertebrae, labeled T1 through T12. 3  Lumbar (lower back) â five or six vertebrae, labeled L1 through L5 or L6.