Questions: The cervical region of the vertebral column consists of 5 vertebrae a single bone derived from the fusion of five vertebrae 12 vertebrae 7 vertebrae

The answer is the last one: 7 vertebrae.

Explanation for each option:

1. 5 vertebrae: This is incorrect. The cervical region of the vertebral column does not consist of 5 vertebrae. The lumbar region, however, consists of 5 vertebrae.

2. A single bone derived from the fusion of five vertebrae: This is incorrect. This description fits the sacrum, which is part of the sacral region, not the cervical region.

3. 12 vertebrae: This is incorrect. The thoracic region of the vertebral column consists of 12 vertebrae.

4. 7 vertebrae: This is correct. The cervical region of the vertebral column consists of 7 vertebrae, labeled C1 through C7.

Summary: The cervical region of the vertebral column consists of 7 vertebrae.