. The American journal of anatomy. -, it is evidently jiist whatHenle named it; it is the equivalent in man of the slip of the flexorbrevis profundus which arises from the first metacarpal and inserts J. Playfair Mc^Iiirrich 493 iuto the proximal phalanx of the thuiiib, and is tlio radial coiinter[)artof the palmar interof-seu& of the iifth digit, as I hope to show later on. The interosseus primus volaris is frequently indistinguishable fromthe deeper portions of the flexor brevis pollicis {sens, kit.), being pos-sibly incorporated with it, although from the fact that in a human em-bryo of G c
. The American journal of anatomy. -, it is evidently jiist whatHenle named it; it is the equivalent in man of the slip of the flexorbrevis profundus which arises from the first metacarpal and inserts J. Playfair Mc^Iiirrich 493 iuto the proximal phalanx of the thuiiib, and is tlio radial coiinter[)artof the palmar interof-seu& of the iifth digit, as I hope to show later on. The interosseus primus volaris is frequently indistinguishable fromthe deeper portions of the flexor brevis pollicis {sens, kit.), being pos-sibly incorporated with it, although from the fact that in a human em-bryo of G cm. which I examined the slip (Fig. 10, fhp].) was exceedinglysmall and showed evident indications of degeneration 1 am inclined tobelieve that the failure to distinguish it may frequently be due quite asmuch to its great reduction as to its fusion with the adjacent if we sup230se that it does frequently become incorporated in thatmuscle or at all events is included in the flexor brevis pollicis as limited. Fig. 10. Transverse section through the hand of a human embryo of 6 cm. uhm,abductor minimi digiti; , caput obliquum and ^, caput transversum of theadductor pollicis; //>, flexor brevis pollicis; /&^ flexor brevis quinti digiti; /bp^.a,nd fbpJ^, radial and ulnar slips of the flexores breves profundi; im, intermetacar-pales; I, lumbricales; m, median nerve; op, opponens quinti digiti; p, tendons ofthe flexor profundus digitorum; s, tendons of the flexor sublimis digitorum ; us,superficial branches of the ulnar nerve. by those who adhere to Albinus conception of the muscle, then theflexor in this sense is really composed of elements from three differentlayers, namely, the supcrficialis. the deeper stratum of the medius andthe profundus. G. The abductor iiollicis.—The abductor pollicis does not seem to existas a distinct muscle in the lower vertebrates I have studied; the mam-malian muscle has appeared within the limits of that ])hylum and Ibelieve, con
Size: 2540px × 984px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1900, booksubjectanatomy, bookyear1901
