134 
MAMMALIAN ANATOMY 
since the efferent vessel continues as an arteriole to finally break up 
into the capillary network of the kidney. 
2. The Ovary (Lab. SI. Coll.). 
Study either macroscopically or with the aid of a dissecting 
microscope, slides showing sections through the ovary of the cat, 
rabbit, or other mammal. Note the general shape and appear¬ 
ance of the section and the location of the hilus (the region of 
attachment to the body wall and of entrance and exit of blood 
vessels and nerves). 
Examine under low power of the compound microscope and 
identify (a) the vascular supporting framework or stroma, of 
a richly cellular connective tissue, which radiates from the hilus 
toward the periphery between certain large oval structures, the 
vesicular ovarian follicles (Graafian follicles); ( b ) the peripheral 
region or cortex, in which are located the various early stages of the 
developing germ cells (ova), each enclosed within a follicle which 
consists of one or more layers of cells; (c) the germinal epithelium 
(often injured in making the preparations), which consists of a 
single layer of epithelial cells covering the surface of the ovary; 
and ( d ), in ovaries of sexually mature animals, larger or smaller 
homogeneous areas each of which is a section through a corpus 
luteum, the structure which for a time occupies the space left by 
the rupture of a mature follicle to discharge the ovum from the 
surface of the ovary. Draw a view of the whole section showing the 
general topography. 
Under low and high power study various stages in the develop¬ 
ment of the ovarian follicles as follows: 
(a) A primary ovarian follicle (young material is necessary for 
this): This consists of a group of cells which has sunk into the 
stroma from the germinal epithelium; one cell of the group devel¬ 
ops into the germ cell (the ovum), the others arrange themselves 
in a single layer about the ovum and form the nutritive layer 
known as the follicular epithelium. Draw a section through a 
typical primary follicle , showing the cell arrangement. 
( b) A vesicular ovarian follicle: This consists of (i) an outer 
covering developed from the stroma and known as the theca 
folliculi, (2) several layers of follicular epithelial cells lining the 
