APPENDIX. 447 



which covers the flexor and extensor tendons, passing into the pad 

 of the sole and forming a thick elastic cushion at the hack part or 

 heel of the foot. 



Subscapulars arises on the greater part of the costal surface of 

 the scapula, comparatively thin and weak, inserted to the internal 

 tubercle of the humerus. The superior anterior angle of the costal 

 surface of the scapula, where it forms a thick surface, is occupied 

 by the attachment of the serratus magnus, it also extends 

 down over a considerahle extent of the vertebral margin of the 

 bone. 



The latissimus dorsi in passing forward to the humerus is 

 extensively connected to the posterior inferior part of the same 

 margin, and lays hold hy a strong aponeurosis to the correspond- 

 ing surface of the subscapular^. 



Coraco brachialis, attached above to the coracoid tubercle, 

 has its tendon firmly attached to the inner surface of the tendon 

 of insertion of the subscapularis, and is inserted into the whole 

 length of the inner ridge of the humerus, as far down as the 

 internal condyle : its tendon of origin passing down almost to its 

 lower end, and the muscular fasciculi numerous, short, and 

 oblique. 



Triceps extensor consists of five heads ; the inner head is small, 

 and arises from the inner head of the humerus as far down as the 

 condyle ; the scapular head is of enormous size, and arises from the 

 whole extent of the posterior margin of the bone ; there is added to 

 this scapular head a flat mass or head, which arises along with it from 

 the posterior part of the margin, and extends down altogether inde- 

 pendently to the inner side of the olecranon. The outer head is 

 massive, and arises from the outer and back part of the humerus as 

 far down as the great external tuberosity of the bone ; from this 

 external tuberosity a small but distinct fifth head arises. The 

 larger and smaller external, internal, and the scapular heads, arc 

 in erted by a common tendon into the olecranon, but the narrow 

 head which arises along with the scapular has a distinct tendon to 

 tin' inner side of the olecranon. 



Flexor >-tir/>/' radialis, from the centre tubercle of the internal 

 condyle, fusiform, except in the central part of its posterior surface, 

 between its two tendons consists of elastic tissue ; distal tendon 



vol. i. 2 <; 



