1390 



THE UHINO GENITAL ORGANS 



is the vertical, slit-like urethral orifice or meatus. The circumference of the base 

 of the glans forms a rounded projecting border, the corona glandis, overhanging 

 a deep sulcus (sulcus retroglandularis\ behind which is the neck of the penis 

 (collum penis}. 



For descriptive purposes it is convenient to divide the penis into three parts 

 the root, the body, and the extremity. 



The root (radix penis} of the penis is triradiate in form, consisting of the di- 

 verging crura, one on either side, and the mesal bulb of the corpus spongiosum. 

 Each crus is covered by the Erector penis muscle, while the bulb is surrounded 

 by the Accelerator urina? muscle. The root of the penis lies in the perineum 

 between the superficial layer of the triangular ligament and the fascia of Colles. 

 In addition to being attached to the pubic rami and to the triangular ligament, 

 the root is bound to the front of the symphysis pubis by the suspensory ligament 

 (lig. suspensorium penis}. The upper fibres of this ligament pass downward from 

 the lower end of the linea alba, and the lower fibres from the symphysis pubis; 

 together they form a strong, fibrous band which extends to the upper surface of 

 the root, where it splits into two fasciculi and blends with the fascial sheath of 

 the organ. 



-MEDIAN GROOVE 



PREPUCE 

 RETRACTED 



FIG. 1140. The penis, proximal portion, seen 

 from below. (Testut.) 



FIG. ll41. Glans penis, under surface. (Testut.) 



The body of the penis (corpus penis'} extends from the root to the ends of the 

 corpora cavernosa between the root and extremity. In the flaccid condition 

 of the organ it is cylindrical, but when erect it has a triangular prismatic form 

 with rounded angles, the broadest side being turned upward, and called the dorsum 

 penis. The lower surface of the body of the penis is called the urethral surface 

 (fades urethralis}. The body is covered by integument, and contains in its 

 interior a large portion of the urethra. 



The extremity is formed by the glans penis, the expanded anterior (distal) end 

 of the corpus spongiosum. It is separated from the body by the constricted neck, 

 which is surmounted by the corona glandis. 



The integument covering the penis is remarkable for its thinness, its dark color, 

 its looseness of connection with the deeper parts of the organ, and for the absence 

 of adipose tissue. At the root of the penis the integument is continuous with 

 that upon the pubes, scrotum, and perineum. At the neck of the glans it leaves 

 the surface and becomes folded upon itself to form the prepuce (praeputium) 

 Fig. 1144). The internal layer of the prepuce is directly continuous, along the 

 line of the 'neck, with the integument over the glans. Immediately behind the 



