168 
and hepaticartery, and the interlobular spaces are 
pecker 29 solely with branches which are derived 
fiom its ramifications. But in the smaller por- 
tal canals (fig. 37, fig. 38) the capsule of Glis- 
son, upon which the plexus chiefly depends, is 
WSS 
A transverse section of a small portal canal and its ves- 
sels, The lobules are in a state of general congestion. 
From Kiernan’s paper. 
No. 1, The portal vein; the greater part of its 
cylinder is in contact with the portal canal. 2, In- 
terlobular branches of the vein entering directly the 
interlobular spaces, with branches of the artery and 
duct, without ramifying in the canal. 3, Two vagi- 
nal branches arising from the vein, and forming a 
vaginal plexus on that side of the vein, which is 
separated from the canal by Glisson’s capsule. 
From the plexus the interlobular branches arise. 
4, The hepatic duct giving off vaginal branches. 5, 
The artery giving off vaginal branches. Glisson’s 
capsule is situated on one side only of the canal, 
situated only upon that side of the vein, on 
which the duct and artery are placed, and the 
vaginal plexus consequently follows the same 
disposition. On the opposite side the portal 
vein being in contact with the lobules, gives off 
interlobular branches directly to the spaces. If 
the portal vein (fig. 38) be laid open in this 
situation, the form of the lobules bounded by 
the interlobular fissures will be distinctly a 
parent through its coats, and the openings of the 
interlobular veins will be found to correspond 
with the interlobular spaces. 
The interlobular veins enter the intervals of 
the lobules through the interlobular spaces and 
divide into numerous minute branches, which 
ramify in the capsules of the lobules and then 
enter their substance. They cover with their ra- 
mifications the whole external surface of the lo- 
bules with the exception of their bases, and of 
those extremities of the superficial lobules which 
appear upon the surfaces of the liver. The 
interlobular veins communicate freely with each 
other and with the corresponding branches of 
adjoining lobules, and establish a general 
portal anastomosis of the freest kind through- 
out the entire liver. When the portal vein is 
well injected, these veins form a series of inos- 
culations which surround all the lobules and 
give to the surface of the organ the appearance 
of a vascular network composed of irregularly 
pentagonal and hexagonal meshes. If the vein 
be only partially injected the interlobular vein 
in the jnterlobaiar space is alone filled, and the 
branches which it sends off into the neighbour- 
Longheren section of a small portal vein 
he lobules are in a state of anewmia,—After 
nan. Ay 
a, Portions of the canal from which the 
removed to show that it is formed by lobules’ 
present the same appearance with those up 
external surface of the liver. 6, The side o 
portal vein which is in contact with the c al. 
side of the vein which is separated he 
by the hepatic artery and duct, by the Glis 
capsule surrounding them,and by the vaginal p) 
d, The internal surface of the portal vein, 
which is seen the outline of the lobules, at 
openings of the interlobular veins which corre 
with the ee acai Upon the oj 
side (c ), the portal vein being se fro 
rand dike A ite are no pa Fo pi é 
openings of smaller portal veins. f, Vaginal 
giving off branches in the portal canal and fo 
a plexus. g, The hepatic artery giving off ) 
branches. A, The hepatic duct giving off y 
branches, " 
ing interlobular fissures not proceeding 
as to inosculate and form meshes, ha 
radiated appearance and resemble a num 
minute stelle; these are the stellated ves 
anatomists. e 
The lobular veins are derived from the’ 
lobular veins; they form a plexus ¥ 
the lobule, and converge from the et 
ference towards the centre, where they term 
in the minute branches of the intralobular 
“This plexus, interposed h 
ews “cas coe 
between th 
lobular portal veins and the intralobularh 
vein, constitutes the venous part of the I 
and may be called the lobular venous pt 
‘fig. 39). The irregular islets of the sub 
of the lobules seen between the meshes 0} 
plexus by means of the microscope an 
acini of Malpighi, and are shown by & 
to be portions of the lobular biliary ph 
The portal vein collects the ve 
from the chylopoietic viscera, and 
lates it through the lobules ; it likewise rec 
the venous blood which results from the 
bution of the hepatic artery to the structt 
the liver; these two sources of supply cons 
the two origins of the portal vein, the abdon 
origin and the hepatic origin. 
ee oe ee ar se ee 
