. A manual of diseases of the nervous system. of this extensor, the hand deviates laterally whenthe thumb is strongly extended. Extensors of the Fingers.—Extensor communis digitorum; E. indicis;E. minimi digiti (musculo-spiral nerve). The common extensor moves thefingers and then the wrist. When the muscle is f aradised, the extension beginsat the distal phalanges, and these become flexed again, when the hand isextended beyond the plane of the forearm, by the tonic force of the flexors,the course of their tendons being elongated by the extension of the , the muscle has little act
. A manual of diseases of the nervous system. of this extensor, the hand deviates laterally whenthe thumb is strongly extended. Extensors of the Fingers.—Extensor communis digitorum; E. indicis;E. minimi digiti (musculo-spiral nerve). The common extensor moves thefingers and then the wrist. When the muscle is f aradised, the extension beginsat the distal phalanges, and these become flexed again, when the hand isextended beyond the plane of the forearm, by the tonic force of the flexors,the course of their tendons being elongated by the extension of the , the muscle has little action on the last two phalanges, since theycannot be extended by the long extensor, if the interossei, their proper exten-sors, are paralysed. During extension by the communis the fingers are sepa-rated from, the second. The extensors of the first and last fingers have asimilar extensor action, but, in addition, they adduct their respective fingerstowards the middle finger. In paralysis, the extension of the fingers is im- FiG. 13. Fig.
Size: 1872px × 1335px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1890, booksubjectnervoussystem, bookye
