140 



have seen this coexisting with the long head ; 6th, a band from the 

 great tuberosity (Meckel); 7th, from the lesser tuberosity (Wood); 

 8th, from the outer lip of the bicipital groove ; 9th, from the tendon 

 of the pectoralis major to the long head; 10th, from the tendon of the 

 lesser pectoral to the short head over the coraco-brachialis ; 1 1th, I have 

 seen a slip of the coraco-glenoid ligament inserted into the intra- 

 articular part of the long head, for which it formed an origin; 12th, a 

 fleshy slip from the internal intermuscular septum to the inner border 

 of the fleshy belly ; 13th, a tendinous fascicle from the triangular liga- 

 ment continued into the short head; 14th, a slip from the 8th rib 

 passing along the border of the serratus magnus to the short head 

 (Wood); 15th, a double short head was described by Theile ; 16th, a 

 head from the floor of the bicipital groove has been seen by Moser 

 (Meckel's "Archiv. Band vii.," p. 227), and Gruber (Midler's "Archiv." 

 1 848, p. 426) ; 1 7th, an origin from the capsular ligament of the shoulder 

 (Wood, Theile). These are the chief forms of supernumerary origins 

 which have been recorded, and of all of them, except 14, 15, and 16, 

 I have seen instances during the past session. Some of my specimens 

 likewise exhibited multiple origins: for instance, in one instance in which 

 no long head existed, one origin sprang from the outer lip of the bici- 

 pital groove ; another from the humerus above the brachialis anticus ; 

 while the short head received an accession from the pectoralis minor. 

 In another subject, the origin from the great tuberosity co-existed with 

 the ordinary heads, and the slip from the coraco-acromial ligament to 

 the short head co-existed with a humeral origin. This latter may be 

 anterior or posterior to the brachial artery. 



4. The palmaris longus has likewise been the seat of very great varia- 

 tions — some referrible to the presence of the palmaris accessorius, and 

 others, anomalies of the normal muscle. During the past session, the 

 commonest variety was the presence of an intermediate fleshy belly 

 with two tendons — one of origin and one of insertion. This I have 

 never seen to co-exist with a normal palmaris;* and so I think it may 

 be regarded as a variation of the proper palmaris longus. In the examples 

 of this variety, the fleshy portion was from two to seven inches in length : 

 in one the tendon of origin was thick and round ; in others it was flat ; 

 in the former the insertion tendon was thin and aponeurotic, while in 

 most of the latter it was thick. One instance occurred in which it was 

 fleshy the whole way, as described by Henle ; in another it was repre- 

 sented by a purely tendinous fasciculus, an arrangement not before de- 

 scribed ; a second head occasionally existed for it, in one instance from the 

 coronoid process under cover of the pronator radii teres (Meckel describes 

 a supernumerary palmaris attached to this process). In another instance 

 the second head arose from the radius in common with the radial origin 

 of the flexor sublimis. Henle (" Muskellehre," p. 192) describes an 

 arrangement somewhat similar to this. In another instance there was 



* Since this was written I have met with an example of the coexistence of a normal 

 palmaris and this variety in the same forearm. 



