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.
Structurally, the first and second cervical vertebrae possess anatomic features distinct from those of the remaining five cervical vertebrae. The first cervical vertebra, C-l or atlas, is a bony ring consisting of anterior and posterior arches connected by two lateral masses.