The definition of asinine is to be silly, stupid or ridiculous. An example of asinine is a foolish prank played on a friend.
In humans, there are twelve thoracic vertebrae and they are intermediate in size between the cervical and lumbar vertebrae; they increase in size going towards the lumbar vertebrae, with the lower ones being a lot larger than the upper.
The other vertebrae of the spine are individual bones. Although they are not normal, transitional vertebrae are not usually a problem for most people who have them. The vertebrae in different sections of the spine have different structures and characteristics.