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The Extensor Pollicis et Indicis Communis Muscle: A Rare Muscular Variation
Author(s) -
Souder Kendall S,
Petrone Ashley B,
Lambert H. Wayne,
Zdilla Matthew J
Publication year - 2019
Publication title -
the faseb journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.709
H-Index - 277
eISSN - 1530-6860
pISSN - 0892-6638
DOI - 10.1096/fasebj.2019.33.1_supplement.616.33
Subject(s) - thumb , anatomy , index finger , forearm , retinaculum , extensor digitorum communis , medicine , dorsum , biology , wrist , tendon
Extension of the index finger and thumb are typically independent movements that are not tethered by muscular attachment. This report demonstrates a case of an extensor pollicis et indicis communis found during the dissection of an 84 year‐old female body donor. The extensor pollicis et indicis communis is a rare muscular variation that originates in the posterior compartment of the forearm, traverses the fourth extensor compartment of the extensor retinaculum, and then bifurcates in the dorsum of the hand to insert at both the thumb and index finger. The action of this muscle is to extend the index and thumb simultaneously in addition to performing thumb reposition. Further, this variation is unique in that it would antagonize and potentially impede the act of pinching as well as opposition of the thumb— both functions that are well‐developed in humans. This abstract is from the Experimental Biology 2019 Meeting. There is no full text article associated with this abstract published in The FASEB Journal .