Nail courses – Hand muscles
The muscles of the hand are short. Muscles on the palmar side are thenar muscles of fingers (thumb, little finger) and the muscles of palm (metacarpus), (lumbrical muscles and interosseous muscles). Interosseous muscles originate from the dorsal side of the hand.
Muscles of the forearm are long muscles which assist in flexion on the palmar side and extension on the dorsal side.