ANATOMY. 23 
viz.: an internal, mucous; a middle, muscular; and an 
external, serous layer. The central or muscular layer 
has its fibres arranged in different directions, some 
longitudinal and others circular, The muscular fibres 
become considerably hypertrophied in the pregnant 
state, and by their contractions are largely responsible 
for the expulsion of the foetus. 
In the Cow, the mucous membrane of the uterus, 
and more especially that of the horns, is studded with 
a great many processes, resembling very much the 
appearance of the half of a large English walnut. 
These processes are called the maternal cotyledons. 
They contact with opposing surfaces on the fcetal 
membrane, and by means of this connection, circulation 
between the foetus and parent takes place in the 
uterus. 
In the Sheep and the Goat, these cotyledons are 
concave on their free surfaces, and in the Mare they 
are entirely absent, the connection being diffuse. 
The uterus is held in position to the sub-lumbar 
region, by two broad ligaments which are attached to 
the superior border of the horns, and between the folds 
of these are found the Fallopian tubes. 
Fallopian Tubes. 
Two in number, are situated between the folds 
and near to the anterior border of the broad ligaments. 
By their posterior extremities, they communicate with 
the uterine horn of their own side, and by their 
anterior extremities, indirectly with the ovary. 
