. Plexus. scientific medicine. Supernumerary (accessory) mus-cles are found everywhere, although the upper extremities seemto have the preferance in this respect; accessory muscles in afew instances have been reported to follow M. flex, profund. digit;though also the other arm-muscles have been found with acces-sories. In Goulds Medl Dictionary, 1896, on p. 795 is described a 104 The Plexus. M. access, ad. M. prof unci; also in Quains Auatamy is such a casementioned. The lower extremities have offered similar anomalies, thoughnot in such great number as the upper ones. Bruhl in Wiener Med. Woc
. Plexus. scientific medicine. Supernumerary (accessory) mus-cles are found everywhere, although the upper extremities seemto have the preferance in this respect; accessory muscles in afew instances have been reported to follow M. flex, profund. digit;though also the other arm-muscles have been found with acces-sories. In Goulds Medl Dictionary, 1896, on p. 795 is described a 104 The Plexus. M. access, ad. M. prof unci; also in Quains Auatamy is such a casementioned. The lower extremities have offered similar anomalies, thoughnot in such great number as the upper ones. Bruhl in Wiener Med. Wochensch, 1871, xxi, 389-91, reportsa case of a M. accessorius externus hallucis longus. In a few instances a muscle has been found to be double,thus Fenwick reports two cases of double M. pronator quadratus(vide: Canadian Med. Jour., Montreal, 1864-65). Gruber reportsin Archiv. f. Pathol. Anat., Berlin, 1877, L xix, 400-403, a caseof M. flex, pollicis longus acting either as a Tenser bursee mucosee Tnnerf-. 7liyr\*si-tA-/^- j];tasyoa£ - X ^. (pi h* of /?* sanrtiort/ • tendinum M. M. flexorum or as the head of M. prof and, digit. InNederl Tijdscher. v. Geneesk, Amsterdam, 1862, vi. 610, is re-ported a case of M. accessorius supinatar brevis, etc. Streets in Am. Jour. Med* Sc, Philadelphia, 1872, Lxiv,131, Supernumerary Muscle. 105 reports anatomical anomalies of M. flex. sub. digit, and of M. pro-fund, digit. The space allotted in the Plexus is however too small to al-low of any extensive treatise on the subject of supernumerarymuscles and their relations to comparative anatomy. For thosewho wish to follow it up more closely, references can be found inthe excellent article written by S. H. Wood in human muscularvariations, etc, in Jour. Anat. and Physiol., London, 1866-67, I,44-59. In Archiv. f. Pathol. Anat., Berlin, 1881, L xxxvi, 471-490,is an excellent monograph about the constant M. extenser polliciset indicis of certain mammalians and their homologues to thesupe
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