The penis is the erectile organ and male copulator.

It is represented by a cylindrical formation that attaches to the most anterior region of the perineum, and whose free end is rounded.

PENIS - CAVE'S BODIES AND SPONY BODYThe tissue that has the capacity to fill and empty blood forms three cylinders, two of which are pairs (right and left) and are situated parallel to each other, above (considering the penis in horizontal or semi-erect position) and the third is odd and average and lies
longitudinally, below the two preceding ones.

The top two cylinders are named after Cavernous Bodies of the penis and the lower one Spongy body of the penis.


The corpus cavernosum of the penis begins posteriorly, through tapered ends that take medially, to the inferior branches of the pube, receiving the name of branches of the corpus cavernosum.

Each branch of the corpus cavernosum is longitudinally enveloped by the fibers of the ischiocavernous muscle on the same side, which fixes it to the respective inferior branch of the pube, constituting the root of the penis.



Source: NETTER, Frank H .. Atlas of Human Anatomy. 2 ed. Porto Alegre: Artmed, 2000.

Moving forward, the two cavernous bodies approach, separated only by a sagittal fibrous septum which is the penis septum.

If we examine the two cavernous bodies below, we will see that in the anteroposterior line of union, a dihedral angle is formed, which then gradually becomes a trickle where the spongy body is housed.

Previously, the corpora cavernosa ends abruptly behind a spongy body expansion known as the glans.

The cancellous body begins later by a median expansion just below the urogenital diaphragm, which is called the penis bulb.

Source: NETTER, Frank H .. Atlas of Human Anatomy. 2 ed. Porto Alegre: Artmed, 2000.

Forwards, the bulb continues with the spongy body, which gradually tapers and lodges in the median groove formed and inferiorly by the two corpora cavernosa.

In the frontal plane in which the corpora cavernosa terminate anteriorly, the cancellous body presents a conical dilation, whose name is off center, that is, its center does not correspond to the great axis of the cancellous body; dilation called glans.

The border surrounding the base of the glans is called the crown of the glans.

At the apex of the glans we find a hole, which is the outer ostium of the urethra.

In this ostium comes the spongy urethra, which runs along the center of the spongy body, from the upper face of the penis bulb, where it penetrates.

At the union of the glans with the rest of the body of the penis, a choke called the neck forms.

The penis could therefore be subdivided into Root, Body and Glans.


Surrounding the free part of the penis we find a thin and sliding skin, known as the foreskin.

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Source: NETTER, Frank H .. Atlas of Human Anatomy. 2 ed. Porto Alegre: Artmed, 2000.

Medium below the glans, the mucosa that surrounds it and then is reflected to line the cutis of the anterior foreskin expansion presents a sagittal fold called the foreskin frenulum.

Structurally, deep into the cutis, lies the subcutaneous mesh, which is named after the superficial fascia of the penis and where smooth muscle fibers are distributed that continue to the scrotum dartos.

On a deeper plane, there is a fibrous membrane that jointly surrounds the corpora cavernosa and the cancellous body that is the deep fascia of the penis.

Source: NETTER, Frank H .. Atlas of Human Anatomy. 2 ed. Porto Alegre: Artmed, 2000.

Both the corpora cavernosa and the cancellous body are each surrounded by a conjunctive membrane called, respectively, the albuginous tunic of the corpora cavernosa and the cancellous body.

The interior of these three elements has a spongy appearance that stems from the existence of numerous fine trabeculae that intersect in disorder.

Between these trabeculae remain spaces that can admit more blood, making the penis an erectile organ.

Penile arteries and veins penetrate or exit at the level of the bulb, and penile branches occur longitudinally on the dorsum providing collateral branches all the way.

The penis and scrotum constitute the male external genital parts, while the rest form the internal genital parts.

Structures of
Male Genital System
Deferent Duct
Ejaculatory Duct
Seminal Gall
Bulbouretral Gland