Fig. 18.—Organs of Reproduction of the Hen (From Salmon.)
a. Undeveloped ovules in ovary.
b. Partly developed ovule showing stigma. Here the follicle wall breaks and allows the ovule yolk to leave the ovary preparatory to laying.
c. An empty follicle in which the stigma and the yolk passed out.
d. Opening of oviduct.
e. Portion of oviduct distended, allowing yolk to pass down.
f. Walls of oviduct which secrete albumen forming the white of the egg.
g. Membranous lining added.
h. Portion of oviduct that secretes shell-forming substance.
i. Cloaca.