Functional Anatomy: Functional anatomy deals on the functions of all the structures studied in gross anatomy.
How the defect in the structure can affect the region it is found and the whole body in general. The anatomical importance of every structure in human body, in normal and abnormal state.
For example, the brachial plexus is a collection of nerves supplying the muscles and skin of the upper limb.
When there is an abnormality or defect affecting any of the nerves, the muscles and regions of the skin it supplies becomes affected and this can affect the movement of the hand; there may be some restricted movement due to that effect.