. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. PRENTISS: POLYDACTYLISM IN MAN AND DOMESTIC ANIMALS. 267 pollicis et indicis {) is a rudimentary muscle in the pig; it arises with the extensor metacarpi obhquus, and its threadlike tendon is lost in that of the extensor communis digitorum internus. Of the posterior muscles we may mention (1) the flexor perforatus, or superficial flexor of the digits (Fig. /, fix. perf.) ; this is composed of two ext. mt'carp. ext. prp. Fig. n. — Left normal manus of pic^, showing extensor muscles, ext. com, dff. i., ex- tenso
. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. PRENTISS: POLYDACTYLISM IN MAN AND DOMESTIC ANIMALS. 267 pollicis et indicis {) is a rudimentary muscle in the pig; it arises with the extensor metacarpi obhquus, and its threadlike tendon is lost in that of the extensor communis digitorum internus. Of the posterior muscles we may mention (1) the flexor perforatus, or superficial flexor of the digits (Fig. /, fix. perf.) ; this is composed of two ext. mt'carp. ext. prp. Fig. n. — Left normal manus of pic^, showing extensor muscles, ext. com, dff. i., ex- tensor communis digitorum internus; ext. mVcarp. mag., extensor metacarpi majiiuis; ext. mt'carp. ob., extensor metacarpi obliquus; , extensor proprius pollicis et indicis; i., extensor proprius internus. 1 natural size. distinct parts, the tendons of which are inserted into the second phalanges of digits III and iv. These tendons form two sheaths for the large ten- dons of the flexor perforans muscle {flx-perf.'), the deep flexor of the. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Harvard University. Museum of Comparative Zoology. Cambridge, Mass. : The Museum
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