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.
Mammals - usually 7 cervical vertebrae. Reptiles, birds, & mammals - 1st two cervical vertebrae are modified & called the atlas & axis. atlas - 1st cervical vertebra; ring-like (most of centrum gone); provides 'cradle' in which skull can 'rock' (as when nodding 'yes') axis - 2nd cervical vertebra.