190 ME. F. E. BEDDAED — CONTEIBUTIOXS TO THE 



point it gives off a very slender tendon running to the thumb ; the main tendon of the 

 muscle siipplies the index. 



(39) Flexor 2>rofundus (perforan^) digitorum is a muscle rather larger than the last; 

 it arises chiefly from the ulna and from the interosseous membrane ; the three tendons 

 become separate at the wrist after perforating the tendons oi t\\e flexor siiblimis; they 

 are attached to the terminal digits of the fingers (Nos. in., iv., and v.). 



(40) There are four Immlricales : the first arises from the deep flexor tendon of the 

 index ; it gives off a slip to the tendon of the flexor sublimis belonging to this digit ; 

 the second muscle arises wholly from the tendon (deep flexor) of digit in. ; the third 

 muscle arises from this tendon and from the next one, that of the fourth digit ; the 

 fourth muscle arises from the two last tendons of the series ; each lumbricalis is 

 inserted on to the extensor tendon of the digit to which it belongs. 



§ 7. The Muscular Anatomy of the Hind Limb. 



(1) Glutceus maximus arises from the fascia lata, from the ilium itself, and from the 

 coccyx ; it is inserted partly on to the fascia covering the thigh and partly by a strong 

 tendon on to the femur just opposite the end of the insertion of the guadratus femoris, 

 continuously with the glutceus maximus ; but arising from the tuber ischii, in common 

 with the biceps and other muscles which take their origin therein, is a fleshy mass 

 which is inserted on to the femur continuously with the tendon of the glutceus, and 

 which also partly fuses with the rectus externus and the femoral head of the biceps. I 

 cannot find any sharp demarcation between the fibres of this muscle and those of the 

 glutceus maximus at their insertion, though the posterior part, which has a mainly 

 muscular insertion, evidently corresponds to the iscMo-femoral of the Orang (see p. 211). 

 The length of the line along which the conjoined muscles are inserted is three and a 

 half inches. 



(2) Glutceus medius arises chiefly from the ilium as far down as on a line with the 

 anterior boundary of the origin of the glutceus minimus ; it also arises from the fascia 

 lata. The fibres of the muscle rapidly converge towards its insertion ; some way in 

 front of the insertion a strong tendinous band is developed within the muscle ; the 

 under and upper surfaces of the muscle only become tendinous a short way in front of 

 its insertion. At its insertion (on to the great trochanter) it comes into close connection 

 with the tendon of the pyriformis. 



(3) Glutceus minimus. — This muscle has a fleshy origin of an inch and three quarters 

 in length from the border of the greater sciatic notch. It becomes partly tendinous on 

 the upper surface some way in front of its insertion ; its insertion is so perfectly 

 continuous with that of the scansorius that it is impossible to say where one begins 

 and the other leaves off. The line of insertion of the two muscles together measures 

 an inch and three quarters. 



(4) The scansori/us is well developed ; it arises chiefly from nearly the whole of the 



