Which muscles are responsible for finger abduction?

The interossei muscles are intrinsic muscles of the hand located between the metacarpals. They consist of four (or three) palmar and four dorsal muscles that, respectively. These muscles are responsible for finger adduction and abduction.

What is the action of dorsal interossei?

The dorsal interossei muscles consist of four short muscles that attach to the adjacent sides of metacarpals 1-4. Their function is to abduct the digits 2-4, as well as to assist in flexion of these fingers at the metacarpophalangeal (MCP) joints and in extension at the interphalangeal (IP) joints.

Why is my first dorsal interosseous muscle swelling?

The dorsal interossei may be injured and inflammation can occur due to overuse, seen especially from long hours of typing or writing. When there is inflammation or tenderness, a simple handshake can be painful. By gently squeezing the hands, or by restricted adduction and abduction of the fingers, injury can be tested.

What nerve Innervates the interossei?

the ulnar nerve
All interossei muscles receive innervation by the deep ulnar branch of the ulnar nerve.

What do the interossei muscles do?

Palmar interossei muscles are strong Adductors of Fingers and assists in flexion of the metacarpophalangeal joints and extension of the interphalangeal joints.

Which finger is not abducted by the dorsal interossei?

The middle digit has two dorsal interossei insert onto it while the first digit (thumb) and the fifth digit (little finger) have none.

What are the actions of the Interossei muscles?

Where does the interossei originate?

Structure. All palmar interossei originate along the shaft of the metacarpal bone of the digit on which they act. They are inserted into the base of the proximal phalanx and the extensor expansion of the extensor digitorum of the same digit.

Why does my interossei hurt?

Palmar interossei are the skeletal muscles of the hand that are responsible for movement of the fingers. Injury to the palmar interossei most frequently occurs due to overuse, such as typing for many hours. Inflammation of the muscles occur, making it difficult or painful to shake hands, type, or wiggle the fingers.

What is the interossei?

The palmar interossei or volar are three short, unipennate muscles on the palmar surface of the hand and along with the dorsal interossei muscles. These occupy the spaces between the metacarpal bones. These are attached to the index, ring, and little fingers. They are smaller than the dorsal interossei of the hand.

What does interossei mean?

or lying between bones
[ ĭn′tər-ŏs′ē-əs ] adj. Connecting or lying between bones.