292 EXTERNAL GENERATIVE ORGANS, BY E. KLEIN. 



Near the ampulla completely formed ganglia exist of sphe- 

 roidal or oblong form, having a diameter of about 0*35 of a 

 millimeter. 



The sheath of the ganglia consists of ordinary fibrillated 

 connective tissue, with interspersed fusiform cells. A few 

 fibres penetrate from the periphery into the interior of the 

 ganglia, and unite with a cell network that is extended through 

 this substance. The ganglion cells found in the ganglia are 

 small, provided with two or three processes, and contain a 

 relatively large, sharply defined, clear nucleus, with distinct 

 nucleoli. Each ganglion cell occupies a nucleated capsule, 

 which, as elsewhere, is composed of connective tissue con- 

 tinuous with the sheath of the nerve fibres joining the cells. 



The plexiform structure in the interior of the ganglia above 

 referred to, only presents distinct nucleated granular cells at its 

 nodal points in newly born infants. 



In the ampulla, and in the vas deferens beyond this point, 

 the ganglionic enlargements contain, besides small ganglion 

 cells, having a diameter of G'0014 of a millimeter, numerous 

 larger ganglion-cells 0*03 of a millimeter in diameter. Both 

 forms possess a nucleated capsule. 



Externally to the nervous plexus, which is usually situated 

 at one side of the vas deferens, is a plexus of veins known by 

 the name of the plexus pampiniformis, as well as a few small 

 arteries. This system of vessels communicates with the 

 proper vascular system of the vas deferens, of which the rich 

 capillary supply of the muscular tunics and the subepithelial 

 plexus of the mucosa are especially worthy of notice. 



The thickness of the walls of the smaller veins of the plexus 

 pampiniformis, and their distinct subdivision into three layers, 

 are remarkable ; of these layers the internal contains elastic 

 fibres and isolated longitudinal muscular fasciculi, the middle 

 circular muscular bundles, whilst the external is a tunica 

 adventitia composed of more loosely arranged longitudinal 

 muscular fasciculi. 



Still more externally, on that side of the vas deferens oppo- 

 site to the cremaster internus, smaller longitudinal muscular 

 fasciculi of smooth muscular tissue are met with, forming a 

 layer that may be named the cremaster medius. The spermatic 



