The Muscles 109 
part are inserted on the carpal bones of the third, 
fourth, and fifth fingers. 
Carpo-phalanget (Plate II., Fig. 2, d). (Extensor 
digitorum brevis, Extenseurs courts, Gemein- 
schaftlicher Strecker der Hand, Extensor digitorum 
communis brevis). Springs from the carpal and, 
in part, from the metacarpal bones and is inserted 
on the terminal phalanges of the five fingers. 
Ulno-carpi-radialis (Ein dem Strecker und Ab- 
zieher des Daumens analoger Muskel, Extensor 
pollicis longus, Extensor carpi-radialis brevior[?]). 
Springs from the under half of the ulna, and is 
inserted on the os carpi-radiale. 
Carpo-phalangeus I (Extensor pollicis brevis). 
This is a small, thick muscle that originates on the 
distal part of the os carpi-radiale and is inserted 
on the phalanx of the thumb. 
Humero-radialis Lateralis (Plate II., Fig. 1, 6) 
(Flexor carpi-ulnaris, Innerer Ellenbogenmuskel, 
Ulnaris internus). A fairly strongly developed 
muscle. It springs from the internal condyle of 
the humerus, extends along the ulna, and is inserted 
on the proximal part of the os carpi-ulnare, and 
the nearby pisiform bone. 
Humero-radialis Medialis (Plate II., Fig. 1, 2) 
(Flexor carpi-radialis, Radialis internus). A 
strongly developed muscle. It springs from the 
internal condyle of the humerus, receives fibers 
from almost the entire length of the radius, and 
is inserted on the proximal end of the os carpi- 
