File:Anatomy, descriptive and surgical (electronic resource) (1860) (14764763305).jpg

Identifier: b20386424 (find matches)
Title: Anatomy, descriptive and surgical (electronic resource)
Year: 1860 (1860s)
Authors: Gray, Henry, 1825-1861 Carter, H. V., ill Westmacott, John Guise, Dr, ill
Subjects: Anatomy
Publisher: London : J.W. Parker
Contributing Library: Wellcome Library
Digitizing Sponsor: Wellcome Library

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pha-langes of the index-finger, inthe manner already described. Relations. They are simi-lar to those of the precedingmuscles. Nerves. The Supinator lon-gus. Extensor carpi radialislongior, and Anconeus, aresupplied by branches from themusculo-spiral nerve. Theremaining muscles of the ra-dial and posterior brachialregions, by the posteriorinterosseous nerve. Actions. The muscles ofthe radial and posterior bra-chial regions, which compriseall the Extensor and Supinatormuscles, act upon the fore-arm, wrist, and hand; theyare the direct antagonists ofthe Pronator and Flexormuscles. The Anconeus as-sists the Triceps in extendingthe fore-arm. The Supinatorlongus and brevis are thesupinators of the fore-arm andhand; the former muscle moreespecially acting as a supina-tor when the limb is pronated.When supination has beenproduced, the Supinator lon-gus, if still continuing to act,flexes the fore-arm. The Ex-tensor carpi radialis longiorand brevier, and Extensorcarpi ulnaris muscles, are the
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OF THE HAND. 283 Extensors of the wrist; continuing their action, they serve to extend the fore-armupon the arm; they are the direct antagonists of the Flexor carpi radialis andulnaris. The common Extensor of the fingers, the Extensors of the thumb, andthe Extensors of the index and little fingers, serve to extend the phalanges intowhich they are inserted; and are the direct antagonists of the Flexors. By con-tinuing their action, they assist in extending the fore-arm. The Extensors of thethumb may assist in supinating the fore-arm, when this part of the hand has beendrawn inwards towards the palm, on account of the oblique direction of the tendonsof these muscles. Muscles and Fascia op the Hand. Dissection (fig. 168). Make a transverse incision across the front of the wrist, and a secondacross the heads of the metacarpal bones, connect the two by a vertical incision in themiddle line, and continue it through the centre of the middle finger. The anterior andposterior annular ligaments

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