Final answer:
The lumbar section of the vertebral column has five vertebrae, characterized by large size due to their role in supporting body weight, with short transverse processes and a blunt, posteriorly projecting spinous process, lacking transverse foramina.
Step-by-step explanation:
The lumbar vertebrae consist of five bones in the lower part of the vertebral column. These vertebrae carry the greatest amount of body weight which is reflected in the large size and thickness of the vertebral body.
Specifically, they have short transverse processes and a short, blunt spinous process that projects posteriorly. In contrast to cervical vertebrae, the lumbar vertebrae do not have transverse foramina.