1868.] Mr. J. Wood on Variations in Human Myology. 



509 



Fig. 7 

 (Subject No. 27.) 



and tendon from the common extensor passed outwards, in the obhque 

 groove of the radius, to be united with the tendon of the extensor secundi 

 internodii pollicis at the base of the first phalanx (fig. 7 a). This very 

 rare abnormahty had its parallel also in the foot, in 

 a slip from the extensor longus digitorum pedis to 

 join the tendon of the extensor proprius hallucis, de- 

 scribed in last year's paper. In both arms of a fe- 

 male (No. 25) a similar tendinous slip joined the 

 tendon of the indicator. This also occasionally has 

 its homologue in the foot in a double tendon to the 

 second foe. 



28. Extensor minimi digiti. — With only two ex- 

 ceptions out of the 36 subjects, this muscle pre- 

 sented a multiplication of its tendon ; and in three 

 instances a complete double muscle was present. In 

 the latter instances, all of which were in males (Nos. 

 1, 14, & 17), and in both arms, the tendon of the 

 abnormal muscle divided into two slips, one of which 

 joined the extensor aponeurosis of the ring-finger. 

 A double muscle has been found by the author in 

 4 males out of 68, and in 1 female out of 34, in all 

 on both sides. In both arms of the male (No. 10) 

 and the female (No. 34), and in the right arm of 

 No. 32, the extensor of the little finger was provided 

 with three tendons, one of which was furnished to 

 the ring-digit. In the right arms of the male (No. 

 1 1) and the female (No. 20), and in the left arm of 

 the male (No. 13), the muscle was provided with 

 two tendons ; one of which went also to the ring- 

 digit. Thus, in 9 subjects, viz. 6 males and 3 fe- 

 males, out of the 18 of each sex, the nw^-digit re- 

 ceived a tendon from the extensor of the little finger, 

 as well as one from the common extensor. In all 

 the instances the latter was placed superficial to the 

 former, constituting a close resemblance to the 

 second or ulnar extensor muscle often met with in 

 the lower animals. 



Out of 68 males this insertion has been found in 9, and out of 34 

 females in 4 ; of these 9 (including 7 males) were found on both sides, 

 3 in the right, and 1 in the left arm only. 



In 28 out of the 36 subjects in the Table, the tendon of the extensor 

 minimi was simply doubled, both being inserted into the fifth digit. 

 Eleven males and 8 females were so provided in both arms, 2 males and 

 1 female in the right arm only, and 6 females in the left arm only. This 

 has been found to be the case altogether in 25 out of 68 males and in 1 8 



