. The American journal of anatomy. rise from the inter-nal condyle of the humerus, theformer having its insertion into theradial side of the carpus and into thebase of metacarpale I, while the lat-ter inserts into the lower part of theradial side of the radius. Finally, constituting the deepestlayer, there is a pronator quadratus(P. Q.), extending between theradius and ulna, and in the proximalpart of the arm a vronator accessorius (Mivart), which arises from theinternal condyle and is inserted into the radins. Before proceeding to a comparison of the individual muscles of theamphibia and rept
. The American journal of anatomy. rise from the inter-nal condyle of the humerus, theformer having its insertion into theradial side of the carpus and into thebase of metacarpale I, while the lat-ter inserts into the lower part of theradial side of the radius. Finally, constituting the deepestlayer, there is a pronator quadratus(P. Q.), extending between theradius and ulna, and in the proximalpart of the arm a vronator accessorius (Mivart), which arises from theinternal condyle and is inserted into the radins. Before proceeding to a comparison of the individual muscles of theamphibia and reptilia a description of the nerves of the forearm in thetwo groups will be necessary. For they present a remarkable similarityin their arrangement and will serve as guides in the determination ofsome of the more obscure homologies. In the amphibia the flexor muscles of the forearm are supplied by alarge trunk which enters from the brachium towards the radial side andconstitutes what has been termed the N. brachialis longus Fig. 3. Transverse section through thewrist of Liolepit^ma laterale. F. C. flexorcarpi radialis; F. C. U., flexor carpi ulnaris;In, intermedium; PP I, first part of deepportion of the palmaris communis; RL,i-adiale; rp, ramus profundus; rsu, ramussuperficialis ulnaris; UL, ulnar; vc, volarcartilae-e. J. Playfair McMurrich 183 It passes obliquely inwards between the flexor carpi radialis and theradius and soon divides into a superficial and a deep branch. Theramus profundus (Fig. 1, rp) passes behind the pronator ,which it supplies, and descends the arm in that position to the loweredge of the muscle, where it comes to lie immediately below, /. e. dorsalto the palnuiris profundus I to which it sends fibres. The superficial branch passes toward the median line of the armventral to the pronator quadratus, and divides into two branches aftergiving a twig to the flexor carpi ulnaris and to the two branches may be ter
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectanatomy, bookyear1901
