THE EXTREMITIES OF ORYCTEROPUS CAPENSIS. 58 







passing under the annular ligament, gained its origin at the middle of the common 

 tendon o? the flexor profundus, at the radial side of the most internal lumbrioati*. 



The flexor sublimis is absent, according to llapp, in the Tamandua, as is also a proper 

 palmaris UmgusK This author, however, describes a te) or ( u Spannniuskor') of the 



ligament, which, at first sight 



e says, might be taken for the latter muscle, but 

 r\n rolare propr m, as under a brid e, and is 



which passes under the Htjamcnlum c< 



attached to the annular ligament. Before, however, its tendon \ es under the rolar 



ligament, it is joined by a muscle which tak s origin from the olc mon and the gr< ter 



part of the length of the ulna*. 



Flexor profundus digUorum. — A hugely d< \ eloped muscle, having a very large and 

 varied extent of origin. It is made up of several factors of irr< ;ular size. One of these 

 arises from the posterior two-thirds of the inner margin of the ulna, and from its palmar 

 aspect for a like extent, the remaining third of the inner mar in of the bom; being 

 occupied by the fibres of origin of thejlexor carpi ulnaris. The above factor, w hen it lias 

 run about two-thirds of its course, is joined by another, which takes origin by a strong 

 tendon from a fossa on the inferior aspect of the humerus, situated between the external 

 condyle and the trochlea, and which also affords origin to another slip, which joins the 

 expanded common tendon in the middle line, lying betwixt the termination of the two 



principal factors of the muscle. 



The greater part of the ulnar division, after being joined by a slip of inconsiderable 

 size, which takes origin from the radius posterior to the insertion of \\\e pronator tare*, 

 passes to the radial side of the expansion of the common tendon of the muscle, the ulnar 

 side of this tendon being joined by a small remaining portion of the ulnar factor, and by 

 that part which arises from the inner condyle of the humerus. This latter consists of 

 two slips, which arise below the origin of $m$ flexor carpi rarfialis, and the ulnar side of 

 which, on completing half of its course, gives origin to the fl< or sublimit This condyloid 

 factor of the muscle lies more superficial throughout its course to that portion which 



takes origin from the radius and ulna. 



At the posterior border of the carpus all these factors join a large tendinous expansion, 

 which has not, as in Dasypus, any sesamoid bone developed in its substance. This 

 expansion, after affording origin to the h> mbricales, divides into four equal-sized tendons, 

 which pass as " perforating'' flexors to the terminal phalanges of the four digits, having, 

 moreover, at the junction of the middle with the distal phalanx of their respective digits, 

 an indication of bifidity, but becoming single again before insertion. 



The sheath of each of these tendons is, at about the middle of the proximal, and the 

 proximal end of the middle phalanx of its proper digit, strengthened by a broad liga- 

 mentous band or arch, which passes from one side of the phalanx to the other, over the 

 subjacent tendon. " Retinacula" also pass from the inferior surface of the " perforating" 

 to that portion of the "perforated" tendon which, after splitting, unites again under the 



former tendon. 



To the upper surface of the origin of the tendon destined for the fourth ("annularis") 



1 Op. tit. p. 48. * Op. tit. p. 4f. 



4 M 2 



