DR. J. MURIE ON THE ANATOMY OF THE SEA-LION. 559 
The teres major (fig. 26, T.ma) is of considerable size, and consequently must occa- 
sionally powerfully flex the upper portion of the limb. It arises below the subsca- 
pularis, at the posterior inferior angle of the scapula, upon the inner surface of that 
bone. It continues tolerably equal in breadth and of considerable thickness towards 
the humerus, and is inserted from the middle of the shaft upwards to the internal 
condyloid ridge, in close adhesion with the dorsi epitrochlear and first head of triceps. 
The teres minor (T.mi), in close union with the teres major, occupies the lower margin 
of the scapula, from where the fibres of the teres major tend towards the humerus, to the 
glenoid cavity itself. Near the latter-mentioned part the fibres of the teres minor are 
sparse ; and there appears to be no distinct point of insertion—the muscle being lost as 
it were upon the second or scapular head of the triceps, at its inner side or border. 
Triceps.—In the case of Otaria the name of this compound muscle is unfortunate, as 
it is composed of four portions and as many heads. Taken as a whole it has a nearly 
equal-sided triangular shape, and is of most extraordinary strength. It is tolerably 
thick and somewhat flattened, in this latter respect adapting itself to the mould of the 
body. 
The posterior division, head, or belly, in reality the dorsi epitrochlearis (figs. 15, 20, 26, 
D.ep), is of a wedge-shape, the broad end upwards, very flat, narrow, and long. This first 
portion arises from the outer and inferior angle of the scapula, and is inserted, almost 
quite separate from its fellow portions, into the tip of the immense and projecting 
olecranon process. The muscular fibres, however, run onwards, and proceed until they 
reach the forearm, covering its posterior border or edge. 
The true first division of the triceps (Z") has also a scapular head of origin; and it is 
this portion which corresponds with the long head of the triceps in human anatomy. 
Somewhat shorter than the dorsi epitrochlearis, it nevertheless is very massive. It arises 
by muscular fibres, having a breadth of 2 inches, from that portion of the posterior 
margin of the scapula between the glenoid cavity and the first head ; continuing down- 
wards, it joins the common cubital insertion of the triceps. 
The second division of the muscle (7) is quite as strong and muscular as the last 
described. This portion, which represents the external head in Man, arises from the 
back of the shaft of the humerus, from the head of the bone to the middle of the 
shaft. Above, it embraces the head on both sides of the bone, and partly covers the 
brachialis anticus muscle. Below, it joins the other tricipital divisions as they go 
towards the elbow-joint. It has also a partial origin from the neck of the scapula 
and the capsular ligament of the joint. These origins are sparse ligamentous bands, 
and have two openings, through which vessels &c. pass. 
The fourth, smallest and shortest division of the triceps arises from the posterior 
surface of the shaft of the humerus, and covers the intercondyloid fossa. It unites with 
the second and third divisions, and all three are together inserted in a fleshy bundle 
into the upper part of the olecranon process. 
VOL. VIL—PART VI. January, 1872. 41 
