The human hand consist of a bony framework and the corresponding muscles, ligaments and tendons, blood supply and innervation. Roughly anatomical, it can be divided into the carpus, the adjacent metacarpus with palm (Palma manus) and back of the hand (Dorsum manus) and the fingers insertinf at their ends (Digiti manus).
Under the skin of the palm, there is a rough tendon plate, the palmar aponeurosis, which is connected to the skin via fibre fascicles. It prevents a too large shift of the soft tissues when gripping very firmly.
The bones of the hand communicating with each other via the joints are moved using the muscles of the lower arm and the short hand muscles. The hand muscles can are divided into the radial muscles of the thenar and the ulnar hypothenar muscles, plus the muscles of the palm.
The sensitive innervation of the joints, skin, ligaments and tendons, and the motoric innervation of the muscles is provided by the Median nerve, the Radial nerv and the Ulnar nerve.
The blood supply comes from the radial and ulnar arteries which are connected with each other via the superficial palmar arc (Arcus palmaris superficialis) and the deep palmar arc (Arcus palmaris profundus).
(Source of picture: Mephant)