Click image to view full screen
The muscles of the hand which attach to and move the fingers and thumb, are defined as follows:
- extrinsic muscles, which arise in the forearm and have long tendons that cross the wrist, and insert into the phalanges.
- intrinsic muscles, which arise within the hand.
The intrinsic muscles of the hand are located in three compartments as follows:
- the thenar compartment, called the thenar eminence, which contains the thumb or thenar muscles.
- the hypothenar compartment, called the hypothenar eminence, which contains the little finger or hypothenar muscles.
- the central compartment, which contains the lumbricals and interosseous muscles.
As the muscles of the hand are studied, the course and distribution of the nerves and blood vessels will be identified.