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A. In the ulnar nerve-deficient hand, the extensor digitorum communis muscle alone can extend the interphalangeal joints of the ring and little fingers in the absence of the interossei and lumbrical muscles if full metacarpophalangeal joint extension is prevented by a splint during an active extensor digitorum communis muscle contraction. B. The splint is shaped so that the intact long finger flexor or flexors can flex the fingers with minimal interference by the splint. Source: The Wrist and Hand Complex, Joint Structure and Function: A Comprehensive Analysis, 5e Citation: Levangie PK, Norkin CC. Joint Structure and Function: A Comprehensive Analysis, 5e; 2011 Available at: http://mhmedical.com/ Accessed: May 11, 2017 Copyright © 2017 McGraw-Hill Education. All rights reserved