18 



The Histology and Physiology of the 



Fig. 2. 



Longitudinal Section from the Superficial Parts of the Corpus Cavernosum 

 (Man). Alcohol Preparation, treated with Carmine, Acetic Acid, and 

 Glycerine. Magnified 15 Diameters. 

 This figure represents the trellis-work of the corpus spongiosum formed by the 



manifold directions and interlacing of its muscular fibres. 



According to Miiller, there are two sets of arteries, differing 

 from one another in their size. The first are the rami nutritii, 

 which are distributed upon the walls of the veins and throughout 

 the spongy substance, differing in no respect from the nutritive 

 arteries of other parts ; they anastomose freely with each other, 

 and terminate in capillaries. The second set he calls arteriae heli- 

 cinse, from their supposed resemblance to the tendrils of the vine. 

 They are given off from the larger branches as well as the smaller 

 twigs of the arteries. They are especially to be seen in good lon- 

 gitudinal sections, sending out short branches somewhat like a ram's 

 horn, several going off from one point in a stellate form, or as the 

 arms of a chandelier, and terminating in an expanded or knob-like 

 extremity, which project freely into the venous cavities (Fig. 5). 

 They are not entirely naked, but are covered with pavement epithe- 

 lium. These arteries are more easy of detection in the corpus 



