442 | EG) Macliaeall 
In the right hand, there is a peculiar abnormality in the inser- 
tion of the tendon to the middle finger. It is firmly affixed to the 
base of the proximal phalanx. The tendon of the flexor profundus 
is also inserted at this point, where the fibers of the two ten- 
dons are closely interlaced. From here to the base of the sec- 
ond phalanx extends a strong tendon, which is so short as not 
to allow the first and second phalanges to form an angle greater 
than 95°. A second tendon internal to this, extends from the base 
of the first phalanx to the terminal phalanx. This tendon is long 
enough to give the terminal phalanx free movement and, as there 
are afew muscle fibers at its origin, it must have had a slight power 
to flex the digit. From their relative positions and insertions, it 
seems fair to suppose that these tendons correspond to the normal 
tendons of the flexor digitorum sublimis and profundus. 
In the baboon, the opposite extreme is found. The sublimis con- 
sists of but one belly (fig. 2,8), which takes its origin from the com- 
mon tendon attached to the medial epicondyle of the humerus. 
The radial origin is not represented even by a fasciculus. The 
belly is no longer than any of the other superficial flexors. The 
special tendons to the digits do not separate until the common ten- 
don has passed the carpal ligament. 
In the chimpanzee, Champneys found an additional origin 
from the radius only for the division to the second digit; Hep- 
burn reports that the tendons for the second and fifth digits had 
radial origins, while those for the third and fourth digits had ulnar 
origins. Macalister, d’Alix and Gratiolet found no radial origin. 
Chudzinski (quoted by Le Double) found that in all races of men 
there was a digastric muscle in the deep part of this muscle. 
TABLE II 
ANIMAL REPORTED BY RADIAL ORIGIN OF FLEX. DIG. SUBLIMIS 
Chimpanzee Macalister absent 
Chimpanzee Gratiolet-Alix absent 
Chimpanzee Hepburn present-supplies digits II-V 
Chimpanzee Champneys | present-supplies digits II 
Chimpanzee Author present-supplies digits IT, III, V 
Baboon Author _ absent 
Man LeDouble variable—may be absent 
