Final answer:
The divisions of the back, or spinal column, are the cervical, thoracic, lumbar, sacral, and coccygeal regions. The cervical region consists of 7 vertebrae, the thoracic region has 12 vertebrae, and the lumbar region contains 5 vertebrae. The sacrum and coccyx are also part of the vertebral column.
Step-by-step explanation:
The divisions of the back, also known as the spinal column, include five regions: cervical, thoracic, lumbar, sacral, and coccygeal regions. The cervical region consists of seven vertebrae (C1-C7) located in the neck, the thoracic region has twelve vertebrae (T1-T12) in the upper back, and the lumbar region contains five vertebrae (L1-L5) in the lower back. The sacral region is formed by the fusion of five sacral vertebrae, and the coccygeal region is formed by the fusion of four coccygeal vertebrae. The total number of vertebrae in the vertebral column is 24, along with the sacrum and coccyx.