How many vertebrae are present in the cervical, thoracic, and lumbar spinal regions respectively?

The number of vertebrae in the spinal regions is well-established in human anatomy. The cervical region consists of seven vertebrae, designated as C1 through C7. This region supports the neck and allows for a range of movements. The thoracic region contains twelve vertebrae, labeled T1 through T12, which are attached to the ribs and provide structure and support to the upper back. Lastly, the lumbar region comprises five vertebrae, numbered L1 through L5, known for their size and strength as they bear the weight of the upper body and allow for movement and flexibility of the lower back.

Therefore, the correct answer represents the anatomical knowledge concerning the vertebral column, where the cervical, thoracic, and lumbar regions have 7, 12, and 5 vertebrae, respectively.