2022年2月1日 · The first dorsal interosseous (1 st DIO) muscle is innervated by the terminal deep branch of the ulnar nerve. It originates on the ulnar proximal edge of the first metacarpal (M1) and on the radial edge of the second metacarpal (M2) and inserts on the dorsal edge of the index finger’s proximal phalanx (P1) via a short tendon ( Fig. 1 ).

In human anatomy, the dorsal interossei (DI) are four muscles in the back of the hand that act to abduct (spread) the index, middle, and ring fingers away from the hand's midline (ray of middle finger) and assist in flexion at the metacarpophalangeal joints and extension at the interphalangeal joints of the index, middle and ring fingers.

2019年11月19日 · The purpose of this study was to describe the variations of the deep motor branch of the ulnar nerve for the adductor pollicis (AP) and the first dorsal interosseous muscle (DIO) to assess the feasibility of selective neurectomy and suggest an ideal surgical approach.

Motor dysfunction of the 1 st dorsal interosseous (DIO) muscle is typically observed in low and high ulnar nerve palsy. This causes weak thumb-index pinch, which can be disabling for the patient. Various reconstructive techniques have been described; however, the choice often depends on th …

Usually, the first dorsal interosseous muscle (FDI) is innervated by the deep branch of the ulnar nerve, which makes abnormal innervation challenging to detect. This difficulty is increased in CuTS patients, many of whom have atrophy. However, the anatomical variations in the FDI will manifest clinically.

The purpose of this study was to describe the variations of the deep motor branch of the ulnar nerve for the adductor pollicis (AP) and the first dorsal interosseous muscle (DIO) to assess the feasibility of selective neurectomy and suggest an ideal surgical approach.

In the hand, there are four dorsal Interossei which lie superficially, in between the metacarpals on the dorsum of the hand. Each muscle is bipennate in shape and extends from the proximal ends of adjacent metacarpals to the proximal phalanx and …

2023年4月7日 · The dorsal interossei muscles comprise four short muscles that connect to the adjoining sides of metacarpals 1-4. They abduct the digits 2-4 and help in the flexion and extension of these fingers at the metacarpophalangeal (MCP) and interphalangeal (IP) joints, respectively. Origins and Insertions of Dorsal interossei muscles. 1st muscle. Origin

Origin: Dorsal 1 - 4: Adjacent sides of two metacarpals (bipennate muscles) Insertion: Dorsal 1 - 4: Extensor expansions and bases of proximal phalanges of digits 2 - 4 Action: Dorsal 1 - 4: Abduct digits from axial line and act with lumbricals to flex metacarpophalangeal joints and extend interphalangeal joints

What is the FDI muscle? In human anatomy, the dorsal interossei (DI) are four muscles in the back of the hand that act to abduct (spread) the index, middle, and ring fingers away from hand’s midline (ray of middle finger) and assist in flexion at the metacarpophalangeal joints and extension at the interphalangeal joints of the index, middle …