Corpus Spongiosum and the Corpus Cavemosum. 21 



Fig. 5. 



Thin Longitudinal Section feom the Posterior Portion op the Corpus 

 Cavernosum (Man). Magnified 15 Diameters. The Organ was injected 



THROUGH THE ARTERIA DORSALIS WITH BeALE.'S BLUE FLUID. AND THEN HARD- 

 ENED in Alcohol. The Thin Section was afterward treated with Car- 

 mine, Acetic Acid, and Glycerine. 



Iu the centre of the figure is seen the artery, a, a, running from below upward. 

 The dark injection in its cavity is well shown. From the right and left of this 

 artery are given off the arterise helicinse, 6, 6, b, b. They assume different forms. 

 Their terminal knobs lie free in the meshes, b* b*, and are covered with pavement 

 epithelium, which by higher magnifying powers are very distinctly brought into 



The knobby terminations of these arteries possess muscular 

 fibres closely packed in concentric circles, which probably act as 

 sphincters to the mouths of these vessels. 



There is one other anatomical fact mentioned by Stilling, to 

 which I will briefly refer, on account of its pathological bearing.* 

 It is the intimate relationship of the epithelial elements of the 

 urethra with sub-mucous tissues of the corpus spongiosum. 



That certain epithelial cells possess prolongations by which they 

 are in intimate connection with the underlying tissues, Stilling 



* This I will reserve for another occasion when I shall have completed some 

 observations now engaged in. 



