2020年6月7日 · The flexor pulley system of the hand is a complex structure that co-ordinates flexion of the digits. It consists of: Long flexor tendons – and their associated synovial sheaths. Annular pulleys – 5 associated with each finger, 2 associated with the thumb. Cruciate pulleys – 3 associated with each finger.

Each finger receives attachment from a FDS and FDP tendon. The thumb only receives the flexor pollicis longus (FPL). The FDS remains palmar to the FDP at the level of the metacarpal.

Anatomy. The flexor tendons are secured in place by a series of pulleys which are fibrous bands wrapping over the tendons and attaching to the bone. Annular pulleys: which wrap transversely over the tendons. Numbered A1 – A4 (see below). Cruciate pulleys: which are paired and cross diagonally over the tendons. Numbered C1 – C3. (see below).

Flexor pollicis longus (FPL) tendon. The FPL tendon bends the thumb. It is unique to humans. It starts as a muscle in the forearm and then travels as a tendon in the wrist through the carpal tunnel. It is then covered by a tunnel, or sheath, and inserts into the most distal (farthest from your body) bone in the thumb.

2024年11月22日 · Anatomy; Videos. Videos. Videos ... Flexor Tendon Conditions ... Flexor Pulley System-Thumb. Oblique pulley (3-5mm) originates at proximal half of proximal phalanx. most important pulley in thumb . functions like cruciate pulley in fingers. in fingers A1-A2-C1-A3. in thumb A1-Av-oblique-A2.

2025年1月27日 · The flexor pollicis longus tendon runs along the palmar side of the thumb, enabling flexion at the MCP and IP joints. The extensor pollicis longus tendon passes over the dorsal side of the thumb, allowing extension at the IP joint.

Thumb flexor tendon sheath. A separate flexor tendon sheath has been described for the thumb. The membranous portion of the sheath originates proximal to the radial styloid in the wrist and...

The thumb is the first digit of the hand that functions differently from the other fingers, which has the greatest range of motion and movement allowing for flexion, extension, abduction, adduction, opposition, and retropulsion

The flexor tendon mechanism works by pulling the flexor tendons towards the forearm, which causes the fingers to flex at the phalangeal and MCP joints. Finger flexion occurs through coordinated muscle contraction and tendon gliding within sheaths.

The flexor tendon sheath in the fingers is a synovial-lined, fibroosseous tunnel with segmental condensations of fibrous tissue. These fibrous bands or pulleys are: (1) the palmar aponeurosis pulley (formed by the transverse fibers of the palmar …