1894.] MAMMALIAN HAND AND FOOT. 365 



There is to be observed the first stage of a crossing of the 

 tendons of the sublimis and profundus, as in the planta pedis. 



/3. Nerves of the extensor side : — 



Earn us superficialis of the musculo-spiral nerve (n. radialis) runs 

 just as in Man. 



The deep branch, situated between the m. bracliialis internus 

 and the supinator longus, ends in branches for the skin which 

 provide the ivhole dorsum maims, except only the ulnar border of 

 the fifth digit. 



2. HEEPESTES GKISEUS. 



(Zool. Soc. Gardens.) 

 a. Flexores. 



From the pronator r. teres come tendinous fibres to join the 

 radialis internus (comp. Sciurus), 



The palmaris longus ends partly in the pads, partly it is inserted 

 into digits 2-5 by delicate tendons which are a little connected 

 with each other. 



Nerve-supply : n. medianus (only). 



There are four strong superficial muscles on the wrist, connected 

 with the ligam. c. transv. and also (partly) with the deep ligaments 

 of the carpus : — 



f (1) Origin : Pp. ; insertion : pollex. 

 } (2) Origin : tendon of the palmaris longus and the 

 Nerv. J former muscle ; ins.: pollex. 



medianus.] (3) Origin : tendon of the palmaris I. ; ins. : pad of 

 the Pm. (or the pisiform) = muse, transversus carpi. 

 [_ (Nerve-supply not quite sure.) 



N. ulnaris : (4) A deep muscle like the former, separated from 

 it by the nerv. ulnaris. 



There are two m. idnares interni, as in Linsang : — 



The ulnaris int. ulnaris (proprius), the stronger one, arises from 

 the humerus and the ulna ; it is inserted by a flat tendon into the 

 pisiform, more superficial and ulnar than the following muscle. 



The ulnaris int. rad. (Jium.eralis) springs from the humerus (cond. 

 int.) and ends fleshy on the pisiform. 



The flexor digitorum sublimis, supplied by both the median and 

 ulnar nerves, divides in four thin and narrow tendons, which end 

 in the tendon-sheaths of digits 2-5. 



The flexor digitorum profundus has five very strong tendons for 

 the 1-5 digits. 



The four lumbricales are also connected with the fl. sublimis ; 

 they form a mass filling the space between the sublimis and the 

 profundus. 



fi. Extensores. 



The supinator longus is fleshy as far as the carpus ; its insertion 

 is not quite distinct on one bone ; there is one insertion into the 



