MR 



ON DASYPUS SEXCINCTUS. 51 







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ligament passing from the above projection to the palmar boss of the 06 teniae ami the 



ulnar margin of the scaphoid groove. 



Flexor sublimis dig itor urn. -This muscle, which appears to be combined with the 

 palmans longus both homologically and functionally, arises from the lowest part of II., 

 inner condyle of the humerus, in company with two heads of the flexor profundus, and 

 passes forwards, muscular for some distance, to blend finally with the palmar fascia 

 which is attached on one side to the pisiform bone, on the other to a small sesamoid 

 which lies alongside of the scaphoid. 



Two digits only are supplied with a tendon from this muscle, namely, the index and 

 middle digit, as Cuvier has figured, but somewhat indistinctly, in one of his plate- of 

 Dasypus ! . 



According to Meckel, however, the superficial flexor in the "Tatu" divides into three 

 muscles— one for the pollex and index (the tendon of which previously splits deeply), 

 one for the third, and the remaining factor for the fourth digit 2 . 



Theile, in noticing varieties of the palmaris longus in the human subject, observes that 

 its absence is sometimes supplied by a tendon of the flexor sublimit. 



Flexor profundus digitorum. — An enormously powerful and complex: muscle, made uj 

 of several elements — which may, however, be considered under two divisions, which ar< 



as follows : 



1. A large muscular mass which arises from the whole of the internal face (or palmar 

 aspect) of the ulna, from the olecranon to within a short distance of the carpal extremity 



of the bone. 



After proceeding a little more than halfway on its course, it is joined, having already 

 become tendinous, by a smaller, but still considerable muscular slip, which takes rise 

 from the inferior surface of the inner condyle of the humerus, in company with the 

 origin of the flexor sublimis and another slip of the deep flexor presently to be described. 

 The slip proceeding from the inner condyle is, soon after its origin, joined by another 

 muscular mass, which arises from the coronoid process of the ulna, from the interosseous 

 septum (between these two heads the ulnar tendon of the biceps and the tendon of the 

 brachial* anticus dip down towards their insertion), and from the radial edge of t he ulna. 

 All these elements of the first muscular mass are continuous with an enormous tendon, 

 iu which, at the beginning of the palm, a large horseshoe-shaped sesamoid bone is 



Twite the tendon joins the sesamoid, the latter is joined, bnt without the inter- 



vention of a tendon, by two mnscular dips, the smaller of which arises from the mfenor 

 surface of the inner condyle of the hnmerns, in company with the supernal flexor, 



, „ „ . . 4. u fw«n n <din which has the same origin but has been 



whose fibres of origin separate it irom a sup wniou ua o 



i i -, ., . \ ., i-i :,i a A f ihp insertion of this slip the sesamoid is joined 

 already described. On the radial side ot tne lnstiuou u i * 



i / , . ,- nh friges f r0 m the whole palmar surface of the radius, 



by a larger muscular element, wincn anses u oiu r 



i . „ , i a l^nnrlprl pxternallv (that is, on its radial margin) 



beginning at the neck of the bone, and bounded exteindnv K , 6 , 



by the insertions of the pronator teres and supinator bt 

 Between the insertions of the two above-described masses 



' F . cit. pi. 260. ' <*■ * p - 659 ' 



into the sesamoid there 



3 



Op 



