[ 438 3 
That the Sulcus of the Livef, thtoiigh which 
the Umbilical Vein paffes, is not always the fame. 
In fome Subjedls it furrounds the Vein along its 
whole Paifage, in others only in Part of its Paffage, 
and in others it is an imperfedt Chanel, which 
merely receives the Vein. 
idly-, There is but one Umbilical Vein, it empties 
itfelf into the Left Extremity of the Sinus Ven^e ’Tor- 
tarum, and fends no Branches to the Liver. 
Ogthly^ The Communication between the Umbi- 
lical Vein, and the Sinus Ven<e Tort arum-, is fo free, 
that the Blood has no Obftacle in palling either Way, 
Our Author asks therefore. What is the Caufe of the 
Blood’s Motion from the Umbilical Vein into the 
Liver, and whether the Pulfation of the Umbilical 
Arteries be one fufficient to produce thisElFed? 
^thly. The Ven£ Tort arum no Branches to 
the Liver, but opens into a particular Sinus, called 
Sinus Ven^e Tortarum', and this Opening is nearer 
to the Right Extremity of the Sinus than to the Left. 
6thly, The Diameter of the Ven£ Tortarum is* 
much lefs than that of the Umbilical Vein. The 
Diameter of the Left Part of the Sinus Ven(S Tor- 
tarum is generally larger than both thefe together, 
never much lefs than that of the Umbilical Veins 
and the Diameter of the Canalis Venofus is leaft of 
all. The Blood therefore of the Vena Tortarum 
mixes with that of the Umbilical Vein in xkiz Sinus. 
And fince the Blood of the Umbilical Vein, which 
abounds with chylous Particles, does thus mix with 
that of the Vena Tortarum In the Foetus, it may be 
asked, Whether in Adults the Branches of the Vena 
Tortarum, which arife from the Stomach and In- 
teftinesj 
