152 
HISTOLOGY OF ANIMALS. 
vascular lamella, and indicated by the dotted line, not 
admitting of their passage through it. The vessels of 
the shaft on reaching the lamella are said to terminate 
in loops. In the opposite half of the same specimen, 
which is represented in the Histological Catalogue, 
Plate VIII, Fig. 4, it may be seen, even with the naked 
eye, that the shaft in the immediate vicinity of the car- 
tilage has a greater number of vessels than any other 
part, and it is at this spot that the growth of new bone 
is taking place. Immediately above these vessels the 
cartilaginous epiphysis is seen, and upon all parts of its 
surface, except those subjected to friction, the capillaries 
of the synovial membrane are distributed, all of them 
terminating in loops. In a vertical section of the head 
of a foetal tibia with its epi- 
physis attached, a rich net- 
work of vessels belonging to 
the synovial membrane rami- 
fies upon its upper margin; 
there are numerous vessels 
also in the epiphysis, some of 
which enter the cartilage near 
Vertical section of the head of a the upper margin, but others, 
tibia of a human foetus. . 
as shown in Fig. 118, may 
be seen winding round between the upper part of the 
shaft and the epiphysis ; these last are derived from the 
articular vessels of the periosteum. 
In the shaft, Haversian canals may be observed, some 
of these have vessels in them. The portion of bone 
FIG. 118 . 
