The body or centrum of the thoracic vertebrae are heart shaped. There are twelve thoracic vertebrae in humans and they are located in the chest.
The atlas and axis are among the cervical vertebrae.
The atlas is the uppermost vertebrae in the neck.
Acoelous vertebrae are flat on both the anterior and posterior ends of the centrum(spool in the middle). An example would be the vertebrae in the human spine.
There are 33 Vertebrae, starting from the top (just under skull) there are: 7 cervical vertebrae 12 thoracic vertebrae 5 lumbar vertebrae 5 sacral vertebrae (fused together) 4 coccygeal vertebrae (fused together)
Cervical
The vertebrae as a whole are considered irregular bones.
Atlas
The first back bone is called as atlas. The Atlas is said to have lifted the earth. This atlas 'lifts' the skull.
The atlas bone (named after Atlas in Greek mythology who held up the world). The first of the cervical vertebrae are the smallest vertebrae.
C1 (Atlas) , and C2 ( Axis ) because they are unlike the rest of the Cervical vertebrae.
The cervical and lumbar vertebrae do not articulate with the ribs. The thoracic vertebrae are the only ones that articulate with the ribs.