150 COUES, 



iug muscles — one of which is an immensely developed a.ucoua3Us, and 

 the other its peculiar antagonist : — 



Anconceus. — Of remarkable size and partly divisible into two por- 

 tions. One of these occupies the lowest part of the humerus behind, 

 somewhat in the position of what is called subanconasus in authro- 

 potomy; it lies beneath the internal head of the triceps, filling the 

 fossa between the olecranon and the humerus below, arising from all 

 the broad depression between the two condylar ridges. It is triangular 

 in outline, but really tetrahedral in shape, and entirely fleshy. Its fibres 

 pass downward, backwai'd,' and very obliquely outward, directly over 

 the back of the elbow-joint, to be inserted into the whole of the supe- 

 rior surface of the olecranon ; but some are continuous with the other 

 part of the muscle, or anconeus proper, passing for this pui-pose 

 through the deep notch between the ectocondyle and the outer angle 

 of the olecranon. The superficial portion of the muscle, however, 

 lias pretty distinct origin from the ectocondyle, and thence spreads 

 out fan-shaped, to be inserted fleshy into the whole outer and back 

 surface of the ulna as far along as the origin of the abductor poUicis 

 longus (except just along the edge and at the tip of the bone, which 

 ai'e resei-ved for origin of extensor carpi ulnaris). The attachments 

 and oblique traction of this muscle make it a powerful rotator of the 

 forearm upon the humerus, as well as an extensor. It is opposed by 



Antanconceus. — A muscle of considerable size that lies very ob- 

 liquely across the inner side of the back of the elbow. It arises from 

 the tip of the entocondyle in connection with the pronator and car- 

 pal "flexors," and immediately forms a thick, bulging fleshy belly 

 that rather suddenly contracts to a short, stout, rounded tendon to be 

 definitely inserted into the prominent tubercle at the inner corner of 

 the olecranon. The muscle lies mostly upon the expanded inner 

 condyle and fills up what would otherwise be an hiatus between the 

 inner head of the triceps below and the ulnar head of the "flexor" 

 carpi ulnaris. It subserves the rotary motion of the forearm, as well 

 as extends the latter ; producing a movement corresponding to supi- 

 nation, and thus directly counteracting the foregoing. 



Bracliialis anticus. — (Flexor cubiti ulnaris.) Keturning now to 

 the flexor set, we find that the " shoi-t" or humero-ulnar fiexor of the 

 forearm is large and lies rather outside, than in front, of the humerus, 

 in consequence of the singular shape of that bone ; it only gains the 

 front more than half way down, and runs up the outside of the bone 

 nearly to the shoulder-joint. Arises, fieshy, from all the depressed 

 space between the great pectoral crest and the prominent ectocondylar 

 ridge ; it is overlaid, above, by the external head of the triceps. 

 Becoming anterior, at length, between the condyles, it dips down be- 

 tween the widely separated bundles of forearm-muscles, and narrows 



