528 Ml'. J. Wood on Variations in Human Myology. [May 23, 



3, 9, 26, & 34) some of tlie indicial fibres of this muscle arose from the 

 iiiner part of the front surface of the radius. In one (IN'o. 9) these were 

 inserted into the side of the long tendon of a fusiform muscle, which 

 (arising with the coronoid origin of the flexor sublimis in connection 

 with a similar one passing to the flexor longus poUicis) passed under the 

 annular ligament and divided into two, one to join the tendon of the 

 flexor longus poUicis, and the other (larger) that of the index perforans. 

 This arrangement, somewhat dissimilar to those formerly described by 

 authors, is yet formed on the same plan or type of the connection be- 

 tween the flexors of the thumb and index and the flexor sublimis. It 

 forms a coalescence of the " Accessorius ad flexorem poUicis lougum," 

 with the " Accessorius ad flexorem digitorum profundum " of Grantzer. 



In No. 26 one half of the muscular fibres oith.Q flexor longus poUicis 

 wxre implanted upon the tendon of the index perforans. In the left 

 arm of jSTo. 6 was found a detached muscular slip from the outer part of 

 the profundus, ending in a tendon which joined that of the suhlimis per- 

 foratus of the index in the palm. It was in the right arm of the same 

 subject that the det^Lched j^erforatus muscle of the index before described 

 was found. In three (Nob. 10, 28, & 33) were found detached mus- 

 culo-tendinous slips of the profundus in the fore arm of a like type. In 

 No. 10 it was single, and gave part origin to the foui^th lumhricaUs. 

 In No. 28 it was lost on the synovial sheath of the tendons in the palm, 

 and in No. 33 it was connected both with this and with the first lumhri- 

 caUs. This has been noticed by Soemmerring, Theile, and Henle. In 

 six subjects were found a coronoid OTigui of the flexor profundus, 2Ji!i%mg 

 in common with the fibres of the flexor suhlimis Si:S a fusiform tapering 

 muscle ending in a rounded tendon. In four (Nos. 7, 9, 13, & 20) this 

 tendon joined the perforating tendon of the index finger ; in one (No. 

 25) that of the middle finger : and in another (No. 31) those of the 

 ring- and little fingers. This muscle is mentioned by Meckel, Soem- 

 merring, Theile, Henle, and by Cowper and Macwhinnie. It was named 

 by Grantzer the " Musculus accessorius ad flexorem profundum digito- 

 rum." In No. 9, as before described, it received muscular fibres also 

 from the radius. 



12. Flexor poUicis longus. — In twelve subjects this muscle also de- 

 rived a separate fusiform musculo-tendinous origin from the coronoid 

 process of the ulna. This has been noticed by Albinus, Otto, Soemmer- 

 ring, and Meckel, and was called by Gantzer the " Accessorius ad flexo- 

 rem pollicis longum." .It is usually alluded to by text-book writers as 

 an occasional origin, described by some from the outer, and by others 

 from the inner side of the coronoid process. The proportion of its oc- 

 currence in thirty-six subjects is one-third. In only three was the origin 

 at all separate from the coronoid fibres of the sublimis. It usually 

 assumes the form of a tapering muscle, detaching itself from the indicial 

 fibres of the sublimis, often in connection with the similar contribution 



