. A manual of diseases of the nervous system. nts arelost, but they can be performed if the proximal phalanges are passively posture of the fingers due to contraction of the palmar fascia resemblesthat in palsy of the long extensor (see Fig. 13), but an examination of thepalm shows the cause of the flexion. Flexors of Fingers.—F. sublimis (median nerve—all fibres C 7 and 8); (median and ulnar nerves). These muscles flex chiefly the secondand third phalanges, the first phalanx being flexed by the interossei. Thesuperficial muscle flexes the second phalanx on the first,
. A manual of diseases of the nervous system. nts arelost, but they can be performed if the proximal phalanges are passively posture of the fingers due to contraction of the palmar fascia resemblesthat in palsy of the long extensor (see Fig. 13), but an examination of thepalm shows the cause of the flexion. Flexors of Fingers.—F. sublimis (median nerve—all fibres C 7 and 8); (median and ulnar nerves). These muscles flex chiefly the secondand third phalanges, the first phalanx being flexed by the interossei. Thesuperficial muscle flexes the second phalanx on the first, the deep flexes action on the first phalanx is confined to extreme flexion of the fingers, and isthe less, the more the wrist is flexed. But if the flexion of the middle and distalphalanges is prevented the first is strongly flexed. In extreme shortening ofthe course of the tendons by flexion of the wrist, the action on the fingers isvery feeble, evidence of a normal antergic action of the extensors of the wrist. Fig.
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