1968 



HUMAN ANATOMY. 



upper expanding into a pyriform mass of erectile tissue, the urethral bulb (bulbus 

 urethrae), and the lower broadening into a conical cap of erectile tissue that covers the 

 ends of the corpora cavernosa and contributes the bulk of the glans. With the 

 exception of the bulb, the major part of which lies behind the canal, the corpus spon- 

 giosum is traversed by the urethra, the cavernous tissue completely surrounding the 

 urinary tube. The bulb, attached by its upper surface to the inferior layer o^ the 

 triangular ligament and covered below by the bulbo-cavernosus muscle, presents a 

 slight median furrow (sulcus bulbi) that suggests a division into the so-called hemi- 

 spheres. Internally an imperfect median sephwi bulbi partially subdivides the erectile 

 tissue below and behind. 



The glans penis consists almost entirely of erectile tissue (corpus cavernosum 

 glandis) directly continuous with that of the spongy body. Its upper surface is 

 hollowed out to receive the pointed extremities of the corpora cavernosa, so that a 

 section across the upper part of the glans shows the erectile tissue of the cavernous 

 bodies surrounded by an overhanging crescent of the cavernous tissue of the glans 

 (Fig. 1674, C). Along the frenum the fibrous envelope of the glans is prolonged 

 inward towards the urethra as a fibro-elastic band (ligamentum medianura glandis) 

 which, in conjunction with a similar band connecting the ends of the cavernous bodies 

 with the upper urethral wall, forms a median partition, the septum gla?idis, that in- 

 completely divides the erectile 

 Fig 1676. 



Erectile tissue of corpus 

 Tunica albuginea cavernosum broken up 

 by pectiniform septum 



Prepuce 



Erectile tissue 

 of glans 



Anterior 

 extremity of 

 corpus cav- 

 ernosum 

 External 

 urethral 

 orifice 

 Navicular fossa 



Frenum Erectile Urethra 



tissue of corpus spongiosum 



Mesial longitudinal section of end of penis. 



tissue of the glans and sur- 

 rounds the terminal part of the 

 urethra. 



The penile portion of the 

 urethra is described with the 

 other parts of the urinary tract 

 in the male (page 1923). 



Beneath the skin and sub- 

 cutaneous tissue the cylinders 

 of erectile tissue, enclosed and 

 united by their albuginea, are 

 enveloped by the superficial 

 fascia (Fig. 1674, E). The 

 latter, directly continuous with 

 that of the perineum (Colles 

 fascia) behind and of the ab- 

 domen (Scarpa's fascia) above, invests the penis as far as the neck, where it becomes 

 blended with the prepuce. This fibro-elastic sheath is often called Xh^ fascia peuis. 



In addition to the attachment of the crura of the corpora cavernosa to the peri- 

 osteum of the pubic arch and of the bulb of the spongy body to the triangular liga- 

 ment, the penis is supported by fibrous bands that extend from the abdominal wall 

 and pubes to the dorsum penis. This triangular sheet, the siispensory ligament, in- 

 cludes a superficial and a deeper portion. The former (ligamentum fundiforme penis) 

 begins at the linea alba, from 4-5 cm. (1^—2 in.) above the symphysis, and consists 

 of elastic bundles prolonged from the deep layer of the superficial fascia downward to 

 the dorsum of the penis (Fig. 1671) at the so-called angle, where it divides into two 

 arms that embrace the penis and, after uniting on the urethral surface, are continued 

 into the septum scroti. The deeper portion ( ligamentum suspensoriura penis) contains 

 compact fibrous bands that pass from the symphysis to the corpora cavernosa, just in 

 advance of their separation into the diverging crura, to blend with the dense albuginea. 

 Structure. — Each of the component cylinders of erectile tissue is enclosed in a 

 robust sheath, the tunica albuginea, composed of dense white fibrous tissue, inter- 

 mingled with relatively few elastic fibres and no muscle. The sheath surrounding the 

 corpora cavernosa, which in places attains a thickness of 2 mm. and is much stronger 

 than that enclosing the spongy body, is imperfect along the opposed median surfaces 

 of the two cylinders, where it forms the pectiniform septum. 



From the inner surface of- the tunica albuginea septa and trabeculae are given off 

 which constitute the framework supporting the vessels and nerves and enclosing the 

 characteristic blood-spaces of the erectile tissue. Numerous bundles of ijivohintary 



