It's the first cervical vertebra located just beneath the skull
The atlas and axis are among the cervical vertebrae.
The atlas is the uppermost vertebrae in the neck.
Atlas, sacral, and urostyle vertebrae are considered typical because of their typical features for their respective regions of the spine. For example, the atlas is the first cervical vertebra that supports the skull, the sacral vertebrae fuse to form the sacrum and provide stability to the pelvis, and the urostyle is a specialized vertebra found in amphibians that supports the pelvis and hindlimbs.
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 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.
The uppermost vertebrae is called the atlas. It is the first cervical vertebra located at the top of the spine, just below the skull. It is named after the Greek Titan Atlas, who held up the celestial spheres.
C-1 (Atlas)