. The American journal of anatomy. t inserted into the opposite sides of the proximal phalanges,except in the cases of the first and fifth digits in which one of the slipsis inserted into the adjacent side of tbe sec(md and fourth digit, respec- J. Playfair McMurrieh 497 tively, along with the radial (or ulnar, as the case may be) slip of thatdiffit. Furthermore, the first and fourth intermetacarpals become asso-ciated with the combined muscles so formed, the three portions thusassociated constituting the first and fourth dorsal interossei. The sec-ond and third intermetacarpals unite with the
. The American journal of anatomy. t inserted into the opposite sides of the proximal phalanges,except in the cases of the first and fifth digits in which one of the slipsis inserted into the adjacent side of tbe sec(md and fourth digit, respec- J. Playfair McMurrieh 497 tively, along with the radial (or ulnar, as the case may be) slip of thatdiffit. Furthermore, the first and fourth intermetacarpals become asso-ciated with the combined muscles so formed, the three portions thusassociated constituting the first and fourth dorsal interossei. The sec-ond and third intermetacarpals unite with the flexor brevis profundusslips of the third digit to form the second and third dorsal interossei,and the flexor brevis profundus slips of the first, second, fourth and fifthdigits which do not unite with intermetacarpals form the palmar inter-ossei. A diagram (Fig. 11) will, I trust, make this description clearand at the same time demonstrate the significance of the mutually com-plementing arrangement of the two sets of Fig. 11. Diaoram showinj; the composition of the interossei of the human , dorsal interossei; ip, palmar interossei. V. Summary. It is difficult and tedious to follow a lengthy description involvingreference to a number of separate structures even when an abundance ofillustrations accompanies it. Owing to my results having been basedvery largely on the study of the serial sections it would require an unduenumber of to demonstrate all the points to which reference hasbeen made in the preceding pages, and hence, I fear, only those who areespecially interested in the subject will have the patience necessary forthe thorough perusal of what I have written. And yet it seems that the 498 ^riie Phylogeny oi the Ialmar Musculature importance of obtaining a correct idea as to the fundamental significanceof the mammalian hand musculature is sufliciently great to interest allstudents of vertebrate morphology in the questions discussed. I have,the
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