THE PENIS 



1391 



urinary meatus it forms a small, secondary reduplication, attached along the 

 bottom of a depressed median raphe, which extends from the meatus to the neck; 

 this fold is termed the frenulum (frenulum praeputii). The integument covering 

 the glans is continuous with the urethral mucous membrane at the meatus; it is 

 devoid of hairs, but projecting from its free surface are a number of small, 



FIG. 1142. o. Capillary network. 

 6. Cavernous spaces. 



FIG. 1143. Connection of the arterial twigs (o) with 

 the cavernous spaces. 



FIGS. 1142 and 1143. From the peripheral portion of the corpus cavernosum penis under a low magnifying 



power. (Copied from Langer.) 



highly sensitive papillae. In the retroglandular sulcus numerous small glands, the 

 glandulae Tysonii odoriferae (glandulae praeputii) have been described. They 

 secrete a sebaceous material of very peculiar odor, called smegma praeputii, which 

 probably contains casein, and readily undergoes decomposition. 



The prepuce covers a variable amount of the glans and is separated from it 

 by a potential sac the preputial sac which presents two shallow recesses (fossae 

 frenuli), one on either side of the frenulum. 



Structure. From the internal 

 surface of the fibrous envelope of 

 the corpora cavernosa, as well as 

 from the sides of the septum, are 

 given off a number of bands or 

 cords which cross the interior of 

 each crus in all directions, subdi- 

 viding it into a number of separate 

 compartments, and giving the entire 

 structure a spongy appearance. 

 These bands and cords are called 

 trabeculae corporum cavernosum, 

 and consist of white fibrous tissue, 

 elastic fibres, and smooth muscle 

 tissue. In them are continued 

 numerous arteries and nerves. 



The component fibres of which 

 the trabeculse are composed are 

 larger and stronger around the 

 circumference than at the centre of 

 the corpora cavernosa; they are 

 also thicker behind than in front. 

 The interspaces, on the contrary, 

 are larger at the centre than at the 

 circumference their long diameter 

 being directed transversely; they 

 are largest anteriorly. They are 

 called cavernous spaces and are occupied by blood during erection, and are lined by a layer of 

 flattened endothelial cells (Fig. 1142). 



The arteries bringing the blood to these spaces are the arteries of the corpora cavernosa 

 and branches from the dorsal artery of the penis, which perforate the fibrous capsule, along 

 the upper surface, especially near the fore part of the organ. 



FOSSA NAVIC- 

 ULARIS 



FRENUNI 

 VALVE OF LA- 

 CUNA MAGNA 



LEFT SIDE OF URETHRA 

 FLOOR OF URETHRA 



LACUNA MAGNA 



PREPUCE 

 RETRACTED 



DORSAL 

 VEIN 



CORPUS 

 CAVERNOSUM CORPUS 



SPONGIOSUM 



FIG. 1144. The penis, distal end, in sagittal section 2 mm. at left 

 of middle line. (Testut.) 



