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The A2 and A4 pulleys arise from the periosteum on the proximal half of the proximal phalanx and the mid portion of the middle phalanx, respectively. [1] The first annular pulley (A1 pulley), near the head of the metacarpal bone, lies in the flexor groove in the deep transverse metacarpal ligament. [2]
Climber's finger is one of the most common climbing injuries within the sport of rock climbing, accounting for about 30% of finger injuries seen in climbers. [1] It is an overuse injury that usually manifests in a swollen middle or ring finger due to a damaged flexor tendon pulley, normally the A2 or A4 pulley.
A pulley is a wheel on an axle or shaft enabling a taut cable or belt passing over the wheel to move and change direction, or transfer power between itself and a shaft. A sheave or pulley wheel is a pulley using an axle supported by a frame or shell (block) to guide a cable or exert force.
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A block and tackle [1] [2] or only tackle [3] is a system of two or more pulleys with a rope or cable threaded between them, usually used to lift heavy loads.. The pulleys are assembled to form blocks and then blocks are paired so that one is fixed and one moves with the load.
The Ware Opening, also known as Meadow Hay Opening, is an uncommon chess opening for White beginning with the move: . 1. a4. It is named after Preston Ware, a U.S. chess player who often played uncommon openings.
The interchange between the A2 motorway and the A4 motorway. The A4 motorway (Romanian: Autostrada A4) is a motorway in Romania that serves as a bypass for the city of Constanța, between Ovidiu and the Port of Constanța, connecting with the A2 motorway via an interchange southwest of the city.