TRANSPORIATION OF SPERM OUTSIDE GENITAL TRACT OF MALE 



187 



HEAD OF EPIDIDYMIS 



WEAK MUSCULAR CONTRACTION 



AND ACCUMULATED PRESSURE 



STRONG MUSCULAR 

 CONTRACTION 



E FFERENT 

 DUCTULES 



BODY OF EPIDIDYMIS 



1 ■ » 



VAS DEFERENS EjACULATORY 



DUCT 



sperm storage in 

 "epididymal well" 



(THE CAUDA E Pl Dl D Y M I D I S ) 

 CILIARY ACTION 

 ACCUMULATED PRESSURE 



A 



SEMINIFEROUS TUBULES '^' 



WEAK MUSCULAR CONTRACTION 



STRONG MUSCULAR CONTRACTION 



lARY ACT ION 

 ACCUMULATED PRESSURE 

 ■SEMINIFEROUS TUBULES 



B, 



EF FERENT 

 DUCTULES 



CILIARY ACTION 



STRONG MUSCULAR CONTRACTION 



-V 



SPERM DUCT 



ACCUMULATED PRESSURE 



SPERM STORAGE 

 SEMINIFEROUS TUBULES 



SPERM DUCT 

 RM STORAGE 

 ULATED PRESSURE 



STORAGE 



c. 



D. 



Fig. 105. Various types of reproductive ducts in male vertebrates. The possible activi- 

 ties which transport the sperm along the ducts are indicated. (A) Mammalian type. 

 (B) Bird, urodele, elasmobranch fish type. (C) Frog type. (D) Teleost fish type. 



the primitive frog, Discoglossus (see Hibbard, '28). Here the sperm must 

 be deposited in close contact with the egg at the time of spawning. In fishes 

 which lay pelagic eggs (i.e., eggs that float in the water and do not sink to 

 the bottom), the male may swim about the female in an agitated manner 

 during the spawning act. This behavior serves to broadcast the sperm in rela- 

 tion to the eggs. 



