AREOLAR TISSUE. 
133 
Diaphragm , or in the Rectus externus muscle from 
the eye of an Ostrich , Fig. 107, the precise point 
where the muscle b ends and the tendon c begins, is 
readily perceptible even to the naked eye, not only 
by the diminished vascularity of the latter, but also 
by the difference in the arrangement of its vessels. 
The vessels of the yellow fibrous tissue are few in 
number, and their arrangement, as shown by D, in 
Fig. 103, is somewhat similar to those of tendon ; the 
connecting branches, however, are not transverse, but 
pass off at angles of about forty degrees, so that the 
spaces enclosed by the vessels have a somewhat diamond- 
shaped or rhomboidal outline. 
The vessels of areolar tissue, on the contrary, are of 
small size and very numerous ; they follow the direction 
of the principal fibres, and, as a general rule, form a 
coarse hexagonal network, which is filled up by capil- 
laries or single vessels. This arrangement is repre- 
the neurilemma are plainly seen proceeding in a straight 
Vessels of areolar tissue from the 
neck of a young Pig. 
FIG. 108 . 
sented by Fig. 108. As areo- 
lar tissue supports both blood- 
vessels and nerves, it often 
happens that the blood-ves- 
sels of the sheath of the for- 
mer, or the neurilemma of the 
latter may be distinguished 
from those of the areolar tis- 
sue itself. In a specimen 
from the Pig , the vessels of 
