500 Mr. J. Wood on Variations in Human Myology. [June 18^ 



an equal division of the tendon of the flexor longus pollicis, joined bodily 

 with the indicial tendon of the profundusy just at the point of origin of the 

 first lumhricalis muscle, which arose equally from both by a double penni- 

 form belly. In the right arm of the same subject, a single penniform 

 muscle, arising from the middle third of the front surface of the radius be- 

 low the flexor longus pollicis, gave off a tendon which passed under the 

 annular ligament behind that of the flexor longus pollicis, and ended by 

 giving origin to the outer half of a bipenniform first lumhricalis muscle ; but 

 it did not form any other kind of junction with the indicial tendon of the 

 profundus. The last abnormality has been observed by Theile and Henle. 

 It has an evident relation to that on the left arm of the same subject, al- 

 though the slip does not quite reach the tendon of the profundus ; and it 

 has also a more remote one to the slip before described from the sublimis 

 to the bipenniform first lumhricalis — the connexion between the two in the 

 latter being kept up by the blending of a coronoid accessory muscle of the 

 profundus or flexor pollicis longus with the slip to the lumhricalis. In one 

 of last year's subjects the tendon to the bipenniform lumbricalis came di- 

 rectly from the belly of the flexor longus pollicis, in place of having a 

 distinct radial muscular belly. In the male (No. 7) the profundus itself 

 gave off a long musculo-tendinous slip to the second lumbricalis. In the 

 female (No. 19) that portion of the fibres of the flexor profundus which 

 arises from the interosseous ligament, and gives rise to the indicial tendon, 

 formed a distinct flexor indicis, an areolar interval extending along its 

 whole length and separating it from the rest of the fibres of the pro- 

 fundus. 



20. Flexor longus pollicis. — In 27 out of the 36 subjects, viz. 13 males 

 and 14 females, this muscle received a fleshy, fusiform coronoid origin, the 

 tnusculus accessorius" of Gantzer. Sometimes it was distinct from the 

 coronoid fibres of the sublimis, but was more frequently blended with them. 

 In both arms of the male (No. 5) the accessory muscle received an addi- 

 tional muscular slip from the condyloid fibres of the sublimis, the fibres of 

 which were continuous with those of the tendon before described as passing 

 to the first lumbricalis muscle. This coronoid or condyloid slip has been 

 found by the author in 40 subjects out of 102, viz. in 22 out of 68 males, 

 and in 18 out of 34 females. It would thus seem to be more common in 

 the latter sex. In 13 of the males and 12 of the females it was present in 

 both arms, in 4 males and 4 females in the right arm only, and in 5 males 

 and 2 females in the left only. The condyloid origin occasionally found 

 forms a still closer homology with the chief or condyloid origin of the com- 

 bined flexors of the lower animals. In 3 subjects, viz. 1 male (No. 13) in 

 both arms, and 2 females (in No. 28 in the right arm, and in No. 32 in the 

 left only), the flexor longus pollicis tendon subdivided into two, the inner 

 and smaller joining in two of them the indicial tendon of the perforans 

 about the wrist — but in one (No. 28) having a distinct insertion into the 

 outer part of the base of the ungual phalanx of the index finger, lying in 



