450 THE ANATOMY OF THE HORSE 



Extensor metacarpi orliquus is .situated on tlie infero-antcrior part of 

 the arm. Orhjlii — from the infero-antcrior and outer part of the radius, 

 extending as high up as tlie middle. Inaerlion — after passing underneath 

 the tendon of the extensor pedis, and over the tendon of the exten.sor 

 metacarpi magnus, to the supero-anterior part of the os metacarpi internum. 

 Action — to confine the tendon of the extensor metacarpi in its place during 

 action and to extend the leg. 



Radialis accessorius is situated on the infero-posterior part of the 

 arm. Origin — from the posterior part of the mitldle of the radius. Inser- 

 tion — to the tendon of the perforans, which it joins opposite the carpo- 

 metacarpal articulation. Action — to assist the perforans. 



MUSCLES OF HAUNCH 



The difficulties experienced b}' the student in distinguishing the muscles 

 of the shoulder are as nothing when compared with those he will encounter 

 in making out the muscles of the haunch. The latter are firmly connected 

 together by fascia, so that their fibres must be divided bj' the knife in order 

 to make them agree with any description which is given of them by com- 

 parative anatomists. To comply with the desire to retain the names used 

 in human anatomy, this has been done to a most ridiculous extent; but 

 unfortunately, as the analogj^ is very slight, the imagination of the dissector 

 has been called into play and different anatomists have pursued a varied 

 nomenclature, to the great annoyance of the student. Thus the triceps 

 abductor femoris of our text is the biceps of Percivall, and the long vaste 

 of Chauveau, but it should either be regarded as one large mass of muscle, 

 in common with the semi-niembranosus and scmi-tendinosus, or if it is 

 divided from them it must itself be described as a tricipital muscle, for it 

 has three distinct insertions. Again, Mr. Percivall describes the rectus as 

 a separate muscle from the two vasti and crureus, and appends a fifth, to 

 which he gives the name of rectus parvus. This appears to correspond w;ith 

 the grele anterieur of Chauveau, and if the analogy of human anatomy is to 

 be taken as a guide, it should properly be described as the crureus. By adopt- 

 ing the same plan as with the muscles of the shoulder joint, the student 

 will be able to ascertain at a glance to which description, in the two authori- 

 ties I have quoted, each particular muscle can be referred. 



SYNONYMS OP THE MUSCLES OF THE HAUNCH. 



NAJfKS rSED IN THE TEXT. MR. PERCIVALL's NOMESCLATL'RE, 



Gluteus externus .... Gluteus externus . . 



,, niaximus maxiimis . . 



,, internus .... ,, miiiiimis . . . 



Tensor vaginte femoris . . Tensor vaginaj . . . 



Triceps abductor femoris. . Biceps abductor . . 



Biceps rotator tibialis . . Adductor tibialis . . 



„ ., . , fRectus .... 



Tnfemoro rotulteas . . • ^ vastus ext. and int. 



Rectus parvus Rectus parvus . . 



Sartorius Sartorius .... 



CHAUVEAU S KAMK3. 



Fessier superficiel. 

 ,, moyen. 

 ,, profond. 

 JIuscle du fascia lata. 

 Long vaste. 

 f Denii-tendineux. 

 I Denii-membraneux. 



Triceps crural. 



Grele ant(5rieur. 

 Long adducteur. 



