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TEXTBOOK OF ZOOLOGY 



the cloaca of the male to the cloaca of the female. This is accom- 

 plished by the cock covering the back of the hen and bringing the 

 cloacal apertures of the two together. The motile spermatozoa 

 migrate up the uterus and oviduct to meet the mature eggs and 

 unite with them in fertilization. In the cock there is a pair of oval, 

 light-colored testes located near the dorsal body wall anterior to the 



OVARY 



FUNNEL OF 

 OV IDUCT 



GLANDULAR 

 P ORTION 



SHELL GLAND 

 PO RTl ON 



CLOACA 



Fig. 329.— Reproductive organs of female chicken. Notice tlie single left ovary 

 and oviduct. (Drawn by Titus Evans.) 



kidneys. From each testis the vas deferens, a duct, leads posteriorly 

 to open in the cloaca. Just before joining the cloaca this duct is 

 dilated to form a storage sac, the seminal vesicle. 



The adult hen has only the left ovary and oviduct, the right 

 having atrophied during embryonic development. The mature ova 

 rupture the wall of the ovary and pass into the oviduct. The 



