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.
In n adult human there are 7 cervical, 12 thoracic, 5 lumbar, 5 sacral (fused), and 4 coccyx that are usually fused into two. That's a total of 33 vertebrae.