The spinous process
of a vertebra
is directed backward and downward from the junction of the laminae
(in humans), and serves for the attachment of muscles
. In animals without an erect stance, the process points upward and may slant forward or backward. Spinous processes are exaggerated in some animals, such as the extinct Dimetrodon
, where they form a sail- or finback.
- - "Superior and lateral views of typical vertebrae."