![]() ![]() The substance of the corpora cavernosa (erectile tissue) consists of numerous sinusoids (lacunar spaces) among interwoven trabeculae of smooth muscles and supporting connective tissue. This focal tunical abnormality in dispensability is called Peyronie’s disease. Regions of the tunica with focal poor dispensability cause the erect penis to bend. The mechanical properties of the tunica which allow for maximum volume changes of the erect penis are called tunica dispensability. The average volume increase of the erect penis from the flaccid volume is 3-fold with a range from 1.7 – 5 fold. Approximately 5% of the tunica is elastin which enables the penis to develop elongation. The tensile strength of the tunica is approximately 1200 – 1500 mmHg making this fascia one of the most strong in the body. The tunica must be able to elongate symmetrically and increase in girth with tumescence, assuring a straight erection. To function effectively, these fascial layers must provide the penis with a wall container capable of withstanding a high degree of rigidity and axial strength when erect, yet be supple when flaccid. The tunica albuginea consists of layers of collagen which can accommodate a considerable degree of intracavernosal pressure prior to rupture. This unique anatomic arrangement, however, unfortunately places the penile crus at great danger from crush injuries during blunt perineal trauma. Such anatomy prevents the erect penis from sinking into the perineum when faced with an axially-oriented vaginal compressive load during intercourse. The crural (roots) of the corpora cavernosa attach at the under surface of the ischiopubic rami as two separate structures. The three cylinders consist of paired corpora cavernosa and a single corpus spongiosum. The penis is composed of 3 spongy cylinders.
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