APPENDIX. 187 



A section of the testicle shows the trabeculge testis, the 

 straight canaliculi (vasa recta), the rete testis continued 

 into the epididymis as the vasa efferentia ; 3 — Blood 

 vessels : tlie spermatic artery, the veins from the pam- 

 piniform plexus, the lymphatics are numerous ; 4 — the 

 nerves come from the sympathetic. 



Epididymis. — It commences in the excretory canal of 

 the testicle, is an elongated body resting upon the su- 

 perior border of the testicle, having a middle portion, 

 flat on both sides, an anterior extremity, head or globus 

 major and a posterior, tail or globus minor, which is 

 continued by the vas deferens. Structure : a simple 

 ciliated epithelium resting on a proper amorphous 

 membrane, placed on unstriped circular fibres in the 

 efferent ducts ; and beyond a stratified ciliated epithe- 

 lium, a proper membrane and two layers of circular 

 and longitudinal unstriped fibres, protected by a fibrous 

 tunic. 



Defere:nt canal — vas deferens. — A flexuous, then 

 straight duct, running from the globus minor to the in- 

 side of the pelvic cavity through the inguinal ring, in- 

 flected there backwards, suddenly dilated and terminat- 

 ing in the vesicula seminalis. Structure : a mucous 

 coat internally, covered by a contractile and a fibrous 

 tunic. 



YESICULiE SEMINALIS AND EJACULATORY DUCT. Sit- 



