Posterior view of the spinal cord in situ with vertebral arches and posterior aspect of sacrum removed and dural sac cut open to reveal the spinal cord and nerve roots.

Skin incisions.

Anatomy of brachial plexus region showing damage to the cervical nerve roots resulting in Erb's palsy.

Sagittal section of termination of spinal cord, in situ; image also shows conus medullaris, filum terminale, and subarachnoid space.

Cross-section of the spinal column through a vertebra (spinal cord, dorsal and ventral roots, spinal ganglions, spinal nerves, dorsal and ventral rami and sympathetic ganglions).

Nerve root compression