18 STUDIES IN COMPAKATIVE ANATOMY. 



Abductor minimi digiti arises from the anniilar ligament and 

 pisiform bone. It is inserted into the sesamoid bone of the 5th 

 digit to the ulnar side (A flexor hrevis digitorum. 



0. and L.— 283, fig. 2; 284, figs. 2, 3, 4 {v). In 283, fig. 2, a 

 small muscle ("abductor" — adductor? — "minimi digiti") is shown 

 internal to the short flexor of the toes. We have not found this. 



The palmar fascia consists of strong fibrous bands crossing in 

 various directions, with large intermediate spaces filled with fat, 

 especially between the digits. An exceedingly strong semi- 

 circular band, concave towards the wrist, stretches across the 

 heads of the metacarpal bones, and forms sheaths in the usual 

 way for the flexor tendons. By dissection these sheaths can be 

 resolved into a superficial or proper transverse ligament, and a 

 deeper layer, which, when divided, presents on its deep surface 

 two tendinous slips passing to be inserted into the base of the 

 second phalanx on each side of the flexor tendon. This dis- 

 position resembles the ordinary arrangement of the flexor 

 suhlimis. 



C. and L., 284, fig. 3. 



Lumbricales arise all together from the superficial surface of 

 the flexor tendon, just above its division. They are four in 

 number, of which the 1st and 2d (from the radial side) are 

 respectively inserted into the bases of the 1st and 2d digits on 

 the ulnar side. The 3d lumbrical is inserted into the deep side 

 of the sheath of the flexor of the 3d digit, and is continuous 

 with one of the lateral tendinous bands of the flexor sheath. 

 The 4th lumbrical passes deeply between the 3d and 4th digits, 

 and is connected with an aponeurosis from the extensor tendon. 

 The 1st and 2d lumbricales appear to have a similar attachment 

 on the extensor side of the manus. 



C. and L. — 284, fig. 4. The 1st lumbrical is not seen in this 

 drawing. 



Flexor brevis poUicis. — The only short muscle of the first digit. 

 Arises by a pointed origin from the os magnum, and is inserted 

 into the sesamoid bone on the head of the first metacarpal. This 

 muscle corresponds most nearly with the inner head of flexor 

 brevis pollicis. 



Not in C. and L. 



Flexor brevis minimi digiti consists of two slips, which arise 



