Knott — On Abnormalities in Human Myology. 423 



adjacent part of the capsule of the shoulder- joint, and is inserted into 

 the upper margin of the tendon of the latissimus dorsi. 



Supinator radii longus accessorius ; Irachio-radialis accessorius ; 

 Irachio-radialis hrevis (vel minor). — Arises with the supinator longus 

 and is inserted a little below the level of the tuberosity of the radius. 

 I have seen one specimen : it is present, according to Krause, in about 

 one per cent, of the bodies examined. The insertion of supinator radii 

 longus I have found double in one case, the upper tendon being attached 

 to the outer surface of the radius about three inches above the level of 

 the styloid process. The radial head passed between it and the 

 lower tendon, which had the normal insertion of supinator longus. 



Extensor carpi radialis accessorius (Wood). — Arises from the outer 

 condyle of the humerus below the attachment of the extensor carpi 

 radialis longior, and travels with the latter muscle — passing through 

 the same groove in the posterior annular ligament of the wrist, and 

 goes thence to its insertion into the base of the first metacarpal bone. 

 I have found it once in a muscular subject. The inferior attachment of 

 this muscle may be into the back of the scaphoid bone, or base of first 

 metacarpal, or into both, as it was in my case ; or into outer edge of 

 abductor poUicis, or of outer head of flexor brevis pollicis. 



Pronator radii teres. — The two heads of this muscle I have found 

 separate through their whole length down to the radial insertion. It 

 occurred in three instances ; in one case on both sides. Twice I have 

 seen a third head arising from the ulna about two inches below the 

 level of the coronoid process. 



Flexor carpi radialis. — This muscle I have seen in four instances 

 taking an accessory slip from the inner margin of the coronoid process 

 of the ulna. In two of them the median nerve passed between the 

 heads. With regard to its insertion, I agree with Professor W. Krause 

 in making the normal one to be into both second and third metacarpal 

 bones. This I found to be the case in nineteen out of thirty-four 

 specimens of the muscle, in which the attachments were made out with 

 care. In one of these cases the insertion was into the trapezium ; in 

 another into trapezium and second metacarpal ; in another into third 

 and fourth metacarpal. 



Flexor carpi radialis hrevis (v. profundus') ; radio-carpus (Fano) ; 

 radialis internus brevis v. minor, v. profundus (Gruber). — One well- 

 developed specimen of this muscle was found among the thirty-four 

 subjects whose fore-arms I specially examined for muscular anomalies. 

 The origin was from the radius outside the flexor pollicis longus, 

 reaching from the lower end of the oblique line down to about the 

 junction of middle with lower third of outer edge of pronator quadra- 

 tus. Its tendon passed through a separate canal in the anterior an- 

 nular ligament close to that for the flexor carpi radialis, and divided 

 into two slips, which went to be inserted into the front of the bases of 

 the second and third metacarpal bones. I have met since with two 

 other specimens of this muscle, similar in origin, but neither nearly so 

 well developed. The insertion varied in each case : one was inserted 

 into the trapezium (the true radio carpus of Fano) ; the other was 



