The<unk> l Column (singular:<unk>  are the individual irregular bones that make up the spinal column (aka ischis) — a flexuous and flexible column.
There are normally thirty-three (33)<unk> e in humans, including the five that are fused to form the sacrum (the others are separated by intervertebral    discs) and the four coccygeal bones which form the tailbone.
The upper three regions comprise the remaining 24, and are grouped under the names cervical (7<unk> e), thoracic (12<unk> e) and lumbar (5<unk> e), according to the regions they occupy.
This number is sometimes increased by an additional<unk>  in one region, or it may be diminished in one region, the deficiency often being supplied by an additional<unk>  in another.
The number of cervical<unk> e is, however, very rarely increased or diminished.
With the exception of the first and second cervical, the true or movable<unk> e (the upper three regions) present certain common characteristics which are best studied by examining one from the middle of the thoracic region.
Vertebra
Skull
Orbit 
Aura 
Nasal bone
Parietal bone
Frontal bone
Axial skeleton