It contracts to force blood from the cavernous spaces in the crura into the corpora cavernosa – this helps maintain erection.Įach mass of erectile tissue has two fascial coverings. Ischiocavernosus (x2) – surrounds the left and right crura of the penis.The anterior fibres also aid in maintaining erection by increasing the pressure in the bulb of the penis. It contracts to empty the spongy urethra of any residual semen and urine. Bulbospongiosus (x2) – associated with the bulb of the penis.There are four muscles located in the root of the penis: The bulb forms the corpus spongiosum, which lies ventrally. The male urethra runs through the corpus spongiosum – to prevent it becoming occluded during erection the corpus spongiosum fills to a reduced pressure.ĭistally, the corpus spongiosum expands to form the glans penis.įig 2 – The erectile tissues of the penis. They are separated by the septum of the penis, although often incompletely. The left and right crura continue anteriorly into the dorsal part of the penis – they form the two corpora cavernosa. The erectile tissues continue into the body of the penis. The left and right crura are located laterally attached to the ipsilateral ischial ramus, and covered by the paired ischiocavernosal muscles. The bulb is situated in the midline of the penile root, and is traversed by the urethra. In the root, these tissues are known as the left and right crura, and the bulb of the penis. The root and body of the penis are spanned by three masses of erectile tissue. The erectile tissues fill with blood during sexual arousal, producing an erection. Note: In the anatomical position the penis is erect, so the dorsal side is that closest to the abdomen and the ventral side is closest to the testes. In this article, we will look at the functions and structure of the penis and how these give rise to certain clinical conditions. It contains the urethra, which carries urine from the bladder to the external urethral orifice, where it is expelled from the body. Micturition – The penis also has an important urinary role.Finally, the penis undergoes remission, returning to a flaccid state. Following emission, (mixing of the components of semen in the prostatic urethra) ejaculation can occur, whereby semen moves out of the urethra through the external urethral orifice. Sexual intercourse – During erotic stimulation, the penis undergoes erection, becoming engorged with blood.
The penis is an external organ of the male reproductive system. 4 Clinical Relevance: Functional Defects of the Penis.3 Clinical Relevance: Phimosis and Paraphimosis.
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