Male anatomy for intracavernous self-injections

Anatomy for intracavernous self-injections

Penis is the copulatory organ of the male. The human penis is anatomically divided into two continuous areas — the body, or external portion, and the root. The root of the penis begins directly below the bulbourethral glands with a long cylindrical body of tissue known as the corpus spongiosum.


This tissue extends through the body of the penis to the tip, where it expands into a mushroom-shaped structure called the glans penis. Running through the centre of the corpus spongiosum is the urethra, a passage for semen and urine.
The urethra ends in a opening at the tip of the glans penis. Beginning alongside of the bulbourethral glands are a pair of long cylindrical bodies called the corpora cavernosa penis. These continue through the body of the penis, occupying the sides and upper portion directly above the corpus spongiosum.


They terminate immediately before the glans penis.
The corpora cavernosa consist of free spaces divided by partitions of
tissue. The tissue consists of muscle, elastic fibre and expansible blood vessels. The corpora cavernosa are termed erectile tissue, because during sexual excitation, tissue is expanded by blood that flows into penile blood vessels and fills their empty spaces. The blood is temporarily trapped in the penis by the constriction of blood vessels.


The penis becomes enlarged, hardened, and erect as a result of this increased blood pressure in the penile blood vessels. The corpus spongiosum is also considered erectile tissue. This area, does not become as enlarged as the corpora cavernosa. The corpus spongiosum has a constant blood flow during erection.
The corpora cavernosa and corpus spongiosum are enclosed by a circular layer of elastic tissue. This in turn is covered by a thin layer of skin. The skin is loose and folded while the penis is in a flaccid state. At the beginning of the glans penis, a circular fold of skin, commonly called the foreskin, extends forward to cover the glans.