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They continue into the dorsal aspect of the shaft forming the two corpora cavernosa that are separated by the septum of the penis. [5] During arousal, the root and the corpora cavernosa engorge with blood and become rigid . Meanwhile, the corpus spongiosum remains pliable making the urethra a viable channel for semen during ejaculation. [6]
The deep dorsal vein of the penis, the cavernosal veins of the penis, and the para-arterial veins of the penis are inside Buck's fascia, but the superficial dorsal veins of the penis are in the superficial fascia immediately under the skin.
The corpus spongiosum is a single tubular structure located just below the corpora cavernosa in males. This may also become slightly engorged with blood, but less so than the corpora cavernosa. This may also become slightly engorged with blood, but less so than the corpora cavernosa.
The function of the corpus spongiosum in erection is to prevent the urethra from pinching closed, thereby maintaining the urethra as a viable channel for ejaculation. To do this, the corpus spongiosum remains pliable during erection while the corpora cavernosa penis become engorged with blood.
The corpora cavernosa are innervated by lesser and greater cavernous nerves and form most of the penis containing blood vessels that fill with blood to help make an erection. [8] The crura are the proximal parts of the corpora cavernosa. The corpus spongiosum is an erectile tissue surrounding the urethra.
The tunica albuginea of the penis forms a thick fibrous coat to the spongy tissue of the corpora cavernosa and corpus spongiosum. [1] The two corpora cavernosa are surrounded by a strong fibrous envelope consisting of superficial and deep fibers. The superficial or outer fibers are longitudinal in direction, and form a single
The body or shaft of the penis is the free portion of the human penis that is located outside of the pelvic cavity. [1] It is the continuation of the internal root, which is embedded in the pelvis and extends to the glans. [2] It is made up of the two corpora cavernosa and the corpus spongiosum on the underside.
In humans, the glans is located over the distal ends of the corpora cavernosa and is a continuation of the corpus spongiosum of the penis. At the summit appears the urinary meatus and at the base forms the corona glandis. An elastic band of tissue, known as the frenulum, runs on its ventral surface.