Sensory afferents of the dorsal column pathway, after passing the medulla, decussate to the contralateral lemniscus before eventually synapsing in the thalamus.

The tracts of the pyramidal system contain the upper motor neurone of the cranial nerves.

In terms of the extrapyramidal tracts:
The Vestibulospinal tract originates from the vestibular nucleus in the .

Which is the only vertebrae not to have a spinous process or body?

In terms of vertebral anatomy, the ligamentum runs vertically connecting the lamina of adjacent vertebrae. It helps maintain an upright posture and assist straightening the spine after flexion.

The sciatic nerve runs from spinal levels L-S