1. Cervical: in the neck, openings for blood and nerve channels and support the weight of the head.
2. Dorsal: in the back, tall spinous processes and large rib articulation surfaces.
3. Sacral: in the hips, solid anchors for powerful leg muscles, fused with each other (sacrum).
4. Caudal: in the tail, chevrons are there which protect a large blood and nerve channel to support the tail muscles.