133 



a female, the pronator quadratus was arranged in a tripartite form, and 

 the lowest portion arose from the inferior extremity of the ulna, and 

 passed downwards and outwards, being inserted into the lowest end of 

 the front of the radius, the anterior ligament of the wrist joint, even as 

 far as the upper edge of the scaphoid bone. In another subject, the 

 pronator sent its lowest fibres, in a fleshy bundle, springing from the 

 ulna, to a small round tendon, which crossed the lowest part of the 

 radius, and was lost in an aponeurosis over the trapezoid bone. In this 

 instance all we require is the suppression of the upper or transverse 

 part of the muscle, which would be useless in the leg, and the vertical 

 elongation of the lower part, and we have precisely the condition 

 observed in the anomaly now recorded. 



30. I have found another instance of the extensor primi internodii 

 hallucis perfectly separate from the extensor proprius hallucis. I 

 have likewise met with a separated tendon arising from the belly of 

 the extensor proprius, and inserted into the first phalanx of the great 

 toe. In one other instance a tendon arose in the annular ligament, 

 without any muscle, and was inserted into the same bone. 



31. The extensor ossis metatarsi hallucis I have seen, but it is 

 much rarer than the last, and during the past session has only occurred 

 in one subject. It was described by Ilenle in his " Muskellehre," 

 p. 275. 



32. A psoas accessorius was present in one male subject, arising 

 from the sides of the bodies of the first and second lumbar vertebrae, by 

 fleshy fasciculi, and inserted into the lateral aspect of the third, fourth, 

 and fifth lumbar vertebral bodies by flat tendinous fasciculi. It seemed 

 a repetition in the lumbar region of the longus colli. 



Of the second class of muscular anomalies, or those in which 

 muscles are reduplicated, the following have occurred during the last 

 year: — (1) Ehomboideus minor, once; (2) extensor ossis metacarpi 

 pollicis (in one subject in which there was no extensor primi internodii 

 pollicis) ; (3) abductor pollicis ; (4) extensor secundi internodii pollicis 

 once; (o) extensor minimi digiti three times. This muscle often had 

 two tendons, and was triple in one, sending two slips to the little and 

 one to the ring finger {vide supra) ; (6) glutaeus maximus in two 

 places; (7) the great pectoral similarly divided, the deepest lamina 

 giving off the entire of the suspensory fraanum ofWinslow; (8) the 

 sterno-cleido-mastoid, as before mentioned ; and, (9) in the same sub- 

 ject the sterno -thyroid ; (10) the adductor longus ; (11) the popliteus I 

 have seen double, the superficial part larger, and lying over the ex- 

 ternal lateral ligament, the deeper layer being under, and attached 

 to the ligament, an arrangement described by Fabricius ab Aquapen- 

 dente. 



The tendency of muscle germs to become doubled is among the most 

 singular facts in teratology ; the mode of duplicity may be one of two, 

 either as in round or long muscles, it may be seen assuming the aspect 

 of two parallel and corresponding muscles, or secondly, in flat muscles 

 it takes the form of bilamination. The former mode of increase I 



