542 Proceedings of tlie Royal Irish Academy. 



radialis and ulnaris, normal; palmaris longus, absent; p. brevis, normal;-, 

 flexor sublimis and profundus digitorum, normal ; lumbricales, normal. 



Musculus access, ad lumbricalem primum : — A slip about the size 

 of a lumbricalis arose from the deep surface of the annular ligament 

 by a tendon; inserted with the first lumbricalis. 



Flex. pol. long. : — Origin normal ; the tendon divided at cleft be- 

 tween second and third pollices into two slips, which were inserted 

 into the third or terminal phalanges, and gave off slips to the conti- 

 guous sides of the bases of the second phalanges of their respective 

 digits. 



Abductor poUicis : — ^Origin normal; insertion, in two parts : one into 

 the base of the terminal bone of the first pollex, on its inner aspect ; 

 the other, by a narrow tendon, which ran along the same side of that 

 bone to its apex, where it ended in a fibrous cap. Action, to abduct 

 and flex first pollex. 



Opponens pol. : — Origin normal ; insertion into the radial edge of 

 the metacarpal bone of first pollex. 



Adductor pol.:- — Origin normal; insertion into the base of first 

 phalanx of third pollex. 



Hex. brev. pol. : — Only one head, the deeper ; origin normal ; two 

 insertions : the first into the outer edge of the metacarpal bone of first 

 pollex, close to its head ; the second, into the base of the first phalanx 

 of the third pollex. The first portion might be regarded as an add. 

 pol. primi. 



Transversus manus : — Origin, the anterior surfaces of the meta- 

 carpal bones of the middle and ring fingers, and the adjacent metacarpo- 

 phalangeal ligaments ; the two slips united, and were inserted into 

 the base of the first phalanx of third pollex, on the inner side. 



lius. access, ad transversum manus : — Origin, the fibrous tissue 

 giving common insertion to the numerous muscles inserted into the 

 base of the first phalanx of third pollex, on its inner side ; insertion, 

 radial side of base of first phalanx of second pollex. 



InterpoUicaris : — Three slips : — First : origin, inner side of first 

 phalanx of third pollex ; insertion, outer edge of metacarpal of first 

 pollex, where it was overlapped by abduct, pol. prim, and oppon. pol. 

 Second slip : origin, anterior metacarpo-phalangeal ligament of third 

 pollex; insertion, inner side of base of terminal bone of first pollex, and 

 the anterior surface of its metacarpal bone. Thii^l slip (interosseous) : 

 origin, from anterior surface and inner edge of metacarpal of first 

 pollex ; insertion, into base of first phalanx, and by tendinous slips into 

 base of second phalanx of second pollex. 



Flexor pol. secundi et tertii : — Origin tendinous, from the tra- 

 pezium and the anterior trapezoid. It divided into two fleshy bellies, 

 which were inserted into the bases of second and third pollices. 



The Muscles of the Left Hand : Anterior Surface : — All the long 

 muscles normal, except the flexor pol. long., the tendon of which 

 divided at cleft between second and third pollices : one part went to 



