CHTBCH OX THE ilTOLOGT OF THE OBAyG rTA>-G. 88 



MeTrMiiaie* mentions, on tLe authority of Gantzer. a fascicle going 

 from the Flexor FoUicis to the tendon of the index. It is remarkable 

 also that the Falmaris Longus, which is so frequently absent iu man, 

 should be pres^ent in most of the Quadrumana.f 



The Abductor Longiis FoUicis or Extensor Ossis JTet-acarpi was 

 present, as also the Fxtensor Secundi Internodii FoUicis, but the 

 Fxtensor Frimi internodii was abse-nt. The tendon of the Extensor 

 Ossis ITetacarpi FoUicis was split into two portions, the larger being 

 inserted into the os trapezium, and the smaller into the metacarpal 

 bone. In man a small slip of the tendon normally goes to the os 

 trapezium. % As no portion of the tendon went to the first phalanx, 

 I see no reason for considering the anterior portion of the tendon 

 as the homologue of the Ext. Frimi Internodii, as is stated by YroHk 

 in the article " Quadrumana," in the Cyclopaedia of Anatomy and 

 Physiology. Exactly the same arrangement was found in the Celus ; 

 but in the ^Slagot, the anterior portion was the larger, and the 

 smaller portion was inserted into a sesamoid bone, and not into the 

 trapezium. Both muscles exist in the Chimpanzee (Trolik, p. 20), 

 and in the GoriUa (Duv. p. 97). 



The Extensor secundi internodii was very weak : it arose from the 

 ulna and the interosseous ligament in front of the Extensor indicis. 

 Duvemoy mentions finding it proportionately as large in the Chim- 

 panzee as in man, and as being smaller and weaker in the Grorilla. 



The Alductor PoUicis Brevis consisted of three distinct thin 

 muscular layers, which were inserted together into the base of the 

 first phalanx. The innermost layer arose fr'om the os trapezium, the 

 other tno from the annular ligament. 



The Opponens FoUicis and Flexor Frevis FoUicis presented no 

 points of interest ; the Opponens was very weak and small, the Flexor 

 of tolerable size. The Adductor FoUicis was very large, arose from 

 the palmar ligament, which was prolonged down the whole length 

 of the metacarpal bones of the third and fourth digits, and was 

 inserted into the under side of the first phalanx of the thumb. The 

 Adductor was with difficulty divisible into two portions, one coming 

 fi'om the palmar ligament, the other from its metacarpal prolonga- 

 tions ; the division between the two was not nearly so evident as in 

 the adductor of the hallux. In the Magot the Adductor possessed 

 two distinct heads, the longer of which came from the external 

 palmar fascia, the shorter from the os trapezium. The Opponens 

 was relatively stronger than in the Orang. The Abductor was formed 

 on the same plan. In both the Cebus and ]\Ligot I found a thin 



* Mr. McWhinnie, Yariedes of ihe Musenkr Svstem. London Medical Gazette, 

 Januarv 1S46. 



•j- Henle, 1. a, p. 196, mentions the following important varietr of the muscle 

 in man, " Instead of the Fhxor polUeis lonpus, the indicator portion of the Flexor 

 digiiorum prcfwuiti^ receires a slender head from the common origin of the SHper- 

 ficial muscles." — [Eds.] 



{ Ellis, Demonstration of Anatomv, p. 3-3, 5th edition. 



g2 



