Anatomy Of The Thumb

This includes the shoulder arm forearm wrist and hand. The hand is a very complex part of the body and all of the parts of the upper extremity are essential to functioning hands.

Dislocations And Chronic Volar Instability Of The Thumb

The thumb also differs in having much freedom of movement and being opposable to tips of other digits.

Anatomy of the thumb. The thumb is capable of opposition abduction adduction and retropulsion in addition to flexion and extension. This tendon helps you bend the thumb. This tendon travels along the back of the thumb and helps straighten the thumb.

The thumb generally receives oxygenated blood by the princeps pollicis artery. It differs from other digits in having only two phalanges tubular bones of the fingers and toes. The upper extremity is a term used to define the upper limb.

The thumb is discussed below see thumb anatomy below. There are four thumb tendons. This tendon helps you move the thumb away from the palm to form an open hand.

Extensor pollicis brevis. This latter bone articulates with the distal phalanx at the interphalangeal joint. Thumb also called pollex short thick first digit of the human hand and of the lower primate hand and foot.

This includes longus and brevis descriptions. The first dorsal interosseus also serves the thumb. The skeleton of the thumb consists of the first metacarpal bone which articulates proximally with the carpus at the carpometacarpal joint and distally with the proximal phalanx at the metacarpophalangeal joint.

Tables and diagrams summarizing the movements and innervation of the fingers and thumb are provided figure 5 and figure 6 and figure 7 and table 1 and table 2 and table 3. The muscles of the thumb all contain the word pollicis and are distinguished by extensor flexor oppenens and abductor designations.

Hands And Musculoskeletal Conditions Msk