218 
Proceedings of the Royal Society of Edinburgh. [Sess. 
A.M.D. The abductor minimi digiti. 
F.B.M.D. The flexor brevis minimi digiti. 
Op.M.D. The opponens minimi digiti. 
D.U. The deep division of the ulnar nerve. 
S.U. Superficial division of the ulnar nerve. 
The muscles marked in a dotted manner are not represented. 1st layer, unshaded ; 
2nd layer, shaded vertically; 3rd layer, shaded transversely. 
Fig. 5. Showing the origins of the abductor and flexor brevis minimi digiti and 
the relations borne by their two heads to the deep division of the ulnar nerve. 
P. Pisiform bone. 
Un. Hook of unciform. 
F.B.M.D. Flexor brevis minimi digiti. 
Ab.M.D. Abductor minimi digiti. 
Op.M.D. Opponens minimi digiti. 
Ul.A. & N. Ulnar artery and nerve. 
A.An.Lig. Anterior annular ligament. 
Fig. 6. The dorsal interossei muscles. 
{Issued separately February 2, 1910.) 
