Kelly — On a Case of Polyclactylism, 543 



second poUex, and at head of first phalanx divided into three slips, the 

 central of which passed on to the terminal phalanx ; the two lateral 

 were inserted into sides of base of second phalanx ; that part of the 

 tendon going to the third pollex was inserted into the base of the ter- 

 minal phalanx. 



Lnmbricales : — The first was very large, and divided into two slijjs : 

 one had the normal insertion ; the other, into the first phalanx of 

 third pollex (lumbricalis ad pollicem tertium ?). 



Abductor pol. : — Origin normal ; three insertions : first, into anterior 

 sru'f ace of metacarpal of first pollex ; second, into an aponeurotic arch 

 extending from the apex of first pollex to base of first phalanx of 

 second pollex ; third, partly into base of first phalanx of second pollex, 

 -and partly into the aponeurotic arch. 



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

 metacarpal bone of first pollex, and tendon of extensor oss. metacarp. 

 pol. 



Add. pollicis : — Origin normal ; insertion into base of first phalanx 

 of third pollex, and slightly in that of second pollex. 



Mex. brev. pol. : — Three origins: two corresponding with the heads 

 of the normal muscle, the third from base of metacarpal bone of third 

 pollex. Insertions, four — first, into outer edge of first pollex ; second, 

 into the inner edge of the same bone ; third, by a small tendon into 

 the cartilaginous ferule on the apex of first pollex ; fourth and largest 

 (consisting of the entire of the portions from the trapezium and annular 

 ligament, and that from the base of the metacarpal bone of pollex 

 three), inserted into base of first phalanx of third pollex. The third head 

 was separated from the rest of the muscle by the deep palmar arch. 



Musculus access, ad trans, manus : — The transversus manus was 

 absent, but I have applied the term " accessorius " to this muscle, o wing- 

 to its similarity to that muscle in the other hand, in origin and inser- 

 tion; but it differed in position, as it overlapped the interpollicares, 

 while the others lay under these muscles. 



Interpollicaris : — Two slips, both wedge-shaped, with their apices 

 reversed. Pirst, superficial ; origin, fleshy, from base of first phalanx 

 ■of second pollex ; insertion, tendinous, into inner side of metacarpal 

 bone of first pollex. Second slip : origin, from inner edge of meta- 

 carpal bone of first pollex, and its anterior surface ; insertion, into the 

 ■base of the first phalanx of second pollex. 



The Muscles of the Right Hand : Posterior Surface : — Supinator 

 long, and extensor carp, longior, normal ; cxt. carp. rad. brev. sends 

 slip to base of metacarpal bone of index finger ; ext. carp, ulnaris, 

 normal, 



Ext. digitorum communis : — The tendon to the index finger was 

 small, and ended in the tendon of ext. indicis ; none to the little finger. 



Ext. min. digit. — Sends a slip to aponeurosis over the last inter- 

 osseous space. 



Ext. oss. metacarp. pol. : — Origin normal ; course normal ; divided 

 into two slips, as is frequently seen : one inserted into base of metacarpals 



