588 MR. J. C. GALTON ON THE MYOLOGY OF 



The radial and ulnar inter ossei of the " middle " and " fourth " dibits, after taking 



-,.„-, _ ^VXXXg 



origin from the corresponding sides of the ligaments of their respective metacarpals, 

 sent each an offset to the sesamoid at the base of the proximal phalanx of its proper 

 digit, and finally joined the extensor tendon above. The radial interosscus, however, of 

 the " middle " digit had two heads of origin, one from the ulnar side of the metacarpal 

 ligament of the index, the other from the radial side of the ligament of its proper 

 metacarpal. 



Each digit, it will be seen, has an interosseous abductor and adductor, the index pos- 

 sessing, moreover, an accessory adductor on its ulnar side. 



Lower Extremity. Gluteus maximus. — A very broad and flat muscle, but of no great 

 thickness. It took origin from the crest of the ilium, and from what, for want of a better 

 term, I must call the " sacral aponeurosis." Its lowest fibres of origin are overlapped 

 by the superior edge of the strongly developed biceps ; which fact may have led Prof. 

 Humphry to describe the gluteus as continued down to the heel 1 , while in reality it is 

 the biceps which undergoes so considerable an extension, a point which Cuvicr has very 

 clearly and correctly indicated in one of his plates 2 . 



The only actual point of insertion of the muscle is the strongly developed third 



trochanter of the femur, to which the gluteus is attached by a flat tendon, developed 



early along its inferior edge. The anterior portion of the muscle, moreover, is lost in 



fascia, in which the tensor fascia terminates, and which is also continuous with the 

 tendon of the biceps. 



Tensor fascia femoris.— Is a distinct muscle 3 , which may be, however, but a differ- 

 entiated layer of the preceding. It takes origin from the homologue of the anterior 

 superior spine of the ilium, being almost completely overlapped by the anterior portion 

 of the gluteus maximus, and is continued into the fascia in which part of the preceding 

 muscle is lost, and with which the tendon of the biceps communicates, and which is also 

 attached to the outer side of the femur from the third trochanter to the condyle. Prof. 

 Humphry evidently regards this muscle as but a differentiated portion of the gluteus. 



The editor of the second edition of Cuvier's ' Lecons,' in the following parenthetical 

 remark, may possibly be alluding to the tensor fascia' :— " Dans tous les mammiferes, 

 le fascia lata a un muscle assez fort qui se separe difficilement du grand fessier." 



Glutens medius.—A well-developed muscle, taking origin from the outer face of the 

 ilium and adjoining portion of the sacrum. The greater part is inserted into the outer 

 and inferior aspect of the great trochanter, covering the terminal portions of the gluteus 

 mmimus and piriformis, the rounded anterior edge becoming intimately connected witli 

 that of the former of these two muscles; while a thin factor, which is rolled over its 

 posterior edge, is inserted along the outer and inferior edge of the femur, nearly as far 

 as the third trochanter. 



Cuvier gives, iu one 

 the gluteus medius. 



of his plates 5 , a very good representation of the two portions of 



Lor 



* Vol. i. p. 521. 



Op 



256. fig 



* Cuvier, pi. 256. fig. I 



