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Motor Cortex Control of a Complex Peripheral Apparatus: The Neuromuscular Evolution of Individuated Finger Movements
Published in Alexa Riehle, Eilon Vaadia, Motor Cortex in Voluntary Movements, 2004
Marc H. Schieber, Karen T. Reilly, Catherine E. Lang
about the wrist. This torque would flex the wrist along with the finger(s) if it were not counterbalanced by an extensor torque at the wrist. Wrist extensor muscles (e.g., extensor carpi ulnaris [ECU] and extensor carpi radialis brevis [ECRB]) indeed become active during many finger flexion movements in both monkeys and humans.2123 By the same token, extrinsic finger muscles can be used to produce counterbalancing torques about the wrist. In humans performing a brisk extension of the little finger, a simultaneous rise in tension in the tendon of abductor pollicis longus (APL) often can be palpated; presumably the contraction of APL counterbalances the wrist torque produced by the extrinsic finger muscles used to extend the little finger, EDC and extensor digiti quinti (EDQ).
Functional Anatomy and Biomechanics
Published in Emeric Arus, Biomechanics of Human Motion, 2017
Musculus extensor carpi ulnaris has its origin at the lateral epicondyle of the humerus and on the posterior/proximal part of the ulna. The distal insertion is on the base of the fifth metacarpal bone. It is an extensor and adductor of the wrist.
A kinematic analysis of the upper limb during the topspin double-handed backhand stroke in tennis
Published in Sports Biomechanics, 2022
Nicholas A. Busuttil, Machar Reid, Molly Connolly, Ben J. Dascombe, Kane J. Middleton
The wrist is pivotal in all tennis strokes as it is the most distal joint of the upper limb’s kinetic chain (Elliott, 2006). Acute wrist pain is among the most common issues reported by elite and recreational tennis players (Stuelcken, Mellifont, Gorman, & Sayers, 2017), and is a likely result of the wrist being the first major joint of the upper limb to absorb ball impact forces (Elliott, 2006). The force of ball impact in groundstrokes often creates a reversal of pre-impact wrist angular velocity (Knudson & Bahamonde, 2001; Knudson & Blackwell, 1997). Historically, wrist injuries in tennis have been sustained by the dominant wrist (the hand that engages the racket on the forehand); however, the emergence of the use of the double-handed backhand as a common technique has increased the exposure of the non-dominant wrist to impact forces during groundstrokes (Stuelcken et al., 2017). Sixty-percent of reported wrist injuries in the non-dominant and dominant wrist have been shown to occur to extensor carpi ulnaris (Tagliafico et al., 2009), with extensor carpi ulnaris tendon pathology the most commonly reported wrist injury in tennis (Montalvan, Parier, Brasseur, Viet, & Drape, 2006; Stuelcken et al., 2017).