294 



EXTERNAL GENERATIVE ORGANS, BY E. KLEIN. 



millimeter, and into all parts of its substance, and even into 

 its folds, a few isolated small muscular fasciculi penetrate. 



The muscular tunic consists chiefly of three layers an 

 internal longitudinal, a middle circular, and an external, which 

 is again longitudinal. The internal is the strongest; the 

 middle and external are of about equal thickness. In the 

 new-born child the thickness of the internal and middle layers 

 amounts to 0'12 of a millimeter, that of the external to 0'03 

 of a millimeter. External to the muscular coat is a tunica 

 adventitia containing numerous vessels and nerves. The 



Fig. 212. 



Fig. 212. Transverse section through the wall of a vesicula seminalis 

 from a Child, a, Epithelium ; 6, mucous layer ; c, internal ; d, mid- 

 dle ; e, external muscular layer ; /, tunica adventitia ; g, ganglia. 

 Magnified with Hartnack's objective system No. 4, ocular 3. 



ganglionic nodules of the nervous plexus attain their greatest 

 development in the vesiculte seminales, where, in addition to 

 numerous large uni-nucleated ganglion cells, they exhibit others 

 that are bi-nucleated. The seminal vesicles of Mammals, 

 according to Leydig, are glandular organs, and in accordance 

 with this either consist of closely approximated acinous glands, 

 or are constructed on the type of a solitary acinous gland. 



III. DUCTUS EJACULATORII. These are lined at their 

 commencement by a single layer of columnar epithelium, 

 the cells, of which are G'014 of a millimeter in height. The 



