548 MESSRS, BEDDAED AND MITCHELL ON THE [June 19, 



Interosseus dorsalis. — The fleshy heads of this muscle arise from 

 the greater part of the internal surface of the shaft of the second 

 metacarpal and from the first quarter of the third metacarpal. The 

 common tendon is inserted at the base of the second phalanx of 

 the second digit. 



Interosseus pahnaris. — The origin of this is partly from the 

 shaft of metacarpal III., but chiefly from the second metacarpal. 

 The tendon is inserted to the flat part of the first phalanx of the 

 second digit. 



Muscles of the Thigh and Leg. (Figs. 4, p. 549, & 5, p. 552.) 



Sartor'ms. — This is very large and strong, it is separated by a 

 wide space from the gluteus maximus. It arises from fascia over 

 the gluteus medius, and from the anterior upper and lower marguis 

 of the ileum. It is inserted on to the ligament containing the 

 patella and on to the crest of the tibia. The patella \\as not 

 ossified, but was represented by a cartilaginous nodule. 



Gluteus maximus. — There is no postacetabular part of this 

 muscle. The origin is entirely tendinous from fascia over the 

 gluteus medius and from the ridge of the ileum above the ace- 

 tabulum as far as the anterior margin of the biceps, with which 

 it was fused for a short distance. The insertion is entirely 

 tendinous to fascia covering the vastus and the crurseus. The 

 innervation of the muscle, so far as it has yet been described, was 

 from the crural plexus. At the posterior margin of the muscle is 

 a separate well-developed muscular slip innervated by a twig from 

 the ischiadicus. This part probably represents the postacetabular 

 division of the muscle. 



Gluteus anterior. — This is a small but very distinct triangular 

 muscle arising fleshy from the ridge of the ileum above the ace- 

 tabulum, being covered exactly by the part of the jireceding muscle 

 which arises from the same region ; its tendon rapidly narrows to 

 its insertion on the outer face of the femur between the tendons 

 of the external obdurator and those of the thii-d and fourth 

 gluteals. It is the most superficial of the muscles inserted on to 

 the upper extremity of the femur. Its nerve comes from the 

 ischiadic plexus. 



Gluteus medius. — The origin of this strong muscle underlaps 

 that of the sartorius, but does not extend to the anterior edge of 

 the ileum. The fleshy origin is confined to the ileum, and the 

 strong short tendon is inserted broadly on to the outer face of the 

 head of the femur ; it has a double innervation, a large branch 

 from the crural plexus, and a small twig from that branch of the 

 ischiadicus that supplies the gluteus anterior. 



Gluteus minimus. — This muscle arises fleshy from the anterior 

 lower border of the ileum, not reaching on to the ribs, and con- 

 tiguous with the lower margin of the medius in its anterior region, 

 while near its insertion it is separated from that muscle by the 

 gluteus quartus. It is inserted tendinously on to the upper end 

 of the shaft of the femur lower down than the insertion of the 



