Till: HHM'IIIM. 7'/./:.\TX. 765 



iniiinl in tho long extensor of the fore-arm; the other traverses the middle cxiensor ; 

 and tlif tliird is inflected <>n the tendon of the groat dorsal muscle, and passes between 

 the middle and lar^e extensor of the fore-arm. When the radial nerve turns outwards 

 around tin- ami. and is placed In-tweeii the anterior liraehial and the mass of the 

 elmnwian mnaclea, it furnishes: 1, Mn.vnlar branches that pass immediately beneath 

 tin extensors of the metacarpus and phalanges; 2, A sensitive branch that leaves this 

 imiM-ular interstice to become subcutaneous. This cutaneous branch of the radial gains 

 the inner face of the fore-arm, and divides in two branches that dew-end parallel to the 

 med.an siil>ciitain -mis vein. One of these is lost around the carpus; tho other is placed 

 a little in front of the metacarpus, and reaches the metacarpo-phnlangeal articulation, 

 where it terminates by two principal filaments that constitute the dorsal colbtferalg of the 

 di'iitx; tli. -re is a third which crosses tho intcrdigitol to anastomose with the palmar 

 d ^laterals. 



The iilnar and median nerve of Ruminants lie beside each other, as far as the middle 

 of the arm. This double cord is situated at the surface of the humeral artery ; ut the 

 carpus the two nerves offer the same distribution as in the Horse, but beyond this there 

 arc' >ome differences. 



The tilnar does not receive a branch from tho median at the carpus, and it forms the 

 exteriutl )il<nitr m-rri- or interossoous palmar of the first space, placed at the external 

 border of the flexor tendons. This nerve is reinforced by a filament deta-'hed from the 

 external plantar, that joins it a little above the fetlock-joint ; it gives ramuscules to the 

 ergot, and is then continued by the external collateral nervo of the outer digit, into the 

 horny claw. 



The median is continued by the internal plantar, or interosseous palmar of the third 

 spa-e. Towards the inferior third of the metacarpus, it divides into three branches: the 

 third passes to the external plantar ; the second proceeds to the interdigital space, where 

 it bifurcates to form the internal collateral pal mar nerves of the external digit,and exti ntnl 

 ciillntrnil of the internal diqit; the third gives some filaments to the ergot, and passes 

 along the digital region, where it constitutes the internal collateral of the internal digit. 



IV.. Three fasciculi are detached from the brachial plexus; the posterior is the 

 most voluminous, and furnishes the radial, median, and cubital. 



The brunches of the plexus that pass to the trunk and the first rays of the anterior 

 limb much resemble those of Ruminants; the branch of the serratus magnus is remarkable 

 for its length and size. 



The median nerve is disposed like that of Solipeds and Ruminants, as far as the carpus ; 

 from this {mint it passes beneath the flexor tendons of the phalanges, gives filaments to 

 the interossoous palmar muscles, and at the two rudimentary digits divides into four 

 branches : the two upper are the smallest, and form the collaterals of the rudimentary 

 dL'its; the inferior two are the longest, and reach the principal interdigital space, 

 forming the collaterals of the two great digits. 



The nlitur gives off, towards the middle of the arm, a branch that pases to the ulna; 

 at the ulna it furnishes several muscular branches. The nerve then bends round t the 

 i.nt.-ide of the fore-arm, and OH arriving above the pisiform bone, bifurcates: one branch 

 HO.B along the outer border of the flexor tendons, and i continued by the collateral of the 

 external digit; the other is placed on the anterior face of the metacarpus, and 'also 

 bifurcates to give the external dibits their dorsal collateral nerves. 



CAKNIVORA. The four last eer\ ical mid tir.-t . doi>al ci>in]M>se the brachial plexus in tho 

 Carnivoni: the fifth cervical gives an iiiMu'iiitinmt filament. When tho plexus is un- 

 ravelled, its principal branches are olwerved to send fibres to each other. 



The number of the distributive branches is tho same as in Solipeds, and the dis- 

 position of the superior branches is so analogous as to call for no remark; so we will 

 only desciilx- the anterior hra< hial, radial, median and eubitd nerve. 



The anterior brachial, or inutculo-cubuieou*. is cmi.-titiitcd by a filament from the sixth 

 < n ii al and the more voluminous brunches coming from the seventh. Placed in front of 

 the axillary ait. ry. this cord arrives at the scapulo-humeral articulation, where it 

 bifurcates: one of the branches passes forward to the biceps ; the other n mains alongside 

 the anterior border of tl.e humeral artery, and terminates by a slightly recurrent branch 

 th-it is buried in the anterior brachial muscle, and by a very fine filament that becomes 

 MiKeiit fi oiis at the elbow, and defends on the inner border of the fore-arm to be I"-t 

 in the \icinity of the carpus. The anterior hrachiiil is therefore, in the.-c animals, a 

 nm-eiil'.- -.italic OILS IP rve. The branch unitim? it to the median nerve is .-ituated a little 

 I.. |..w the middle of the humerus, instead of being beneath tho axillary artery, as in 

 Soli|>ed8. 



Tin- rml'iil I,- //', in the Dog, is exHu.-ivi-ly formed by tho eighth cervical ; it n iv. > 

 filaments from the median, ulnar, and axillary n. r,. . and gives branches to these three. 



