Region of the vertebral column posterior to the caudal-sacral region, that may consists of two or three to more than 100 vertebrae. These vertebrae exhibit a gradual reduction in the sizes of their transverse processes and zygapophyses, but these structures are never entirely absent. All caudal vertebrae bear haemal arches.[AAO]

in AAO, this is posterior to the caudal-sacral region

Subdivision of vertebral column that corresponds to the caudal subdivision of the body, containing the caudal vertebrae.

caudal vertebrae series

axial skeleton tail region

caudal skeleton

uberon

tail region

caudal region

postsacral region

UBERON:0006076