There are seven cervical vertebrae, twelve thoracic vertebrae, five lumbar vertebrae, five fused sacral vertebrae forming the sacrum and three to five coccygeal vertebrae, forming the coccyx.
It descends in the middle line in front of the fourth and fifth lumbar vertebr, the sacrum and coccyx, ending in the glomus coccygeum (coccygeal gland).
The spinal cord is divided into five sections: the cervical, thoracic, lumbar, sacral, and coccygeal regions.
The transverse processes are most prominent and noticeable on the first coccygeal segment.
In humans, there are 31 pairs of spinal nerves: 8 cervical, 12 thoracic, 5 lumbar, 5 sacral and 1 coccygeal.
Sacral and coccygeal vertebras are fused and thus often called sacral bone or coccygeal bone as unit.
It then fuses with the periosteum, a membrane found at the surface of all bones, and forms the coccygeal ligament.
The dock consists of the muscles and skin covering the coccygeal vertebrae.
