Perineal artery

perineal vesselsTransverse perineal artery
The perineal artery (superficial perineal artery) arises from the internal pudendal artery, and turns upward, crossing either over or under the superficial transverse perineal muscle, and runs forward, parallel to the pubic arch, in the interspace between the bulbospongiosus and ischiocavernosus muscles, both of which it supplies, and finally divides into several posterior scrotal branches which are distributed to the skin and dartos tunic of the scrotum.wikipedia
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Internal pudendal artery

Dorsal artery of clitorisdeep artery of clitorisinternal pudendal vessels
The perineal artery (superficial perineal artery) arises from the internal pudendal artery, and turns upward, crossing either over or under the superficial transverse perineal muscle, and runs forward, parallel to the pubic arch, in the interspace between the bulbospongiosus and ischiocavernosus muscles, both of which it supplies, and finally divides into several posterior scrotal branches which are distributed to the skin and dartos tunic of the scrotum.
Some sources consider the urethral artery a direct branch of the internal pudendal artery, while others consider it a branch of the perineal artery.

Ischiocavernosus muscle

ischiocavernosus
The perineal artery (superficial perineal artery) arises from the internal pudendal artery, and turns upward, crossing either over or under the superficial transverse perineal muscle, and runs forward, parallel to the pubic arch, in the interspace between the bulbospongiosus and ischiocavernosus muscles, both of which it supplies, and finally divides into several posterior scrotal branches which are distributed to the skin and dartos tunic of the scrotum.

Bulbospongiosus muscle

bulbospongiosusbulbocavernosusbulbocavernosus muscle
The perineal artery (superficial perineal artery) arises from the internal pudendal artery, and turns upward, crossing either over or under the superficial transverse perineal muscle, and runs forward, parallel to the pubic arch, in the interspace between the bulbospongiosus and ischiocavernosus muscles, both of which it supplies, and finally divides into several posterior scrotal branches which are distributed to the skin and dartos tunic of the scrotum.

Inferior rectal artery

inferiorinferior hemorrhoidal arteriesinferior rectal arteries
As it crosses the superficial transverse perineal muscle it gives off the transverse perineal artery which runs transversely on the cutaneous surface of the muscle, and anastomoses with the corresponding vessel of the opposite side and with the perineal and inferior hemorrhoidal arteries.
They anastomose with the corresponding vessels of the opposite side, with the superior and middle rectal arteries, and with the perineal artery.

Pubic arch

subpubic angleArcus pubispelvic ischial arch
The perineal artery (superficial perineal artery) arises from the internal pudendal artery, and turns upward, crossing either over or under the superficial transverse perineal muscle, and runs forward, parallel to the pubic arch, in the interspace between the bulbospongiosus and ischiocavernosus muscles, both of which it supplies, and finally divides into several posterior scrotal branches which are distributed to the skin and dartos tunic of the scrotum.

Posterior scrotal arteries

posterior scrotal branchesPosterior scrotalPosterior scrotal artery
The perineal artery (superficial perineal artery) arises from the internal pudendal artery, and turns upward, crossing either over or under the superficial transverse perineal muscle, and runs forward, parallel to the pubic arch, in the interspace between the bulbospongiosus and ischiocavernosus muscles, both of which it supplies, and finally divides into several posterior scrotal branches which are distributed to the skin and dartos tunic of the scrotum.

Dartos

dartos fasciaDartos muscledartos tunic
The perineal artery (superficial perineal artery) arises from the internal pudendal artery, and turns upward, crossing either over or under the superficial transverse perineal muscle, and runs forward, parallel to the pubic arch, in the interspace between the bulbospongiosus and ischiocavernosus muscles, both of which it supplies, and finally divides into several posterior scrotal branches which are distributed to the skin and dartos tunic of the scrotum.

Scrotum

scrotalscrotal skinprescrotal
The perineal artery (superficial perineal artery) arises from the internal pudendal artery, and turns upward, crossing either over or under the superficial transverse perineal muscle, and runs forward, parallel to the pubic arch, in the interspace between the bulbospongiosus and ischiocavernosus muscles, both of which it supplies, and finally divides into several posterior scrotal branches which are distributed to the skin and dartos tunic of the scrotum.

Transverse perineal muscles

superficial transverse perineal muscleDeep transverse perineal muscleTransversus perinei superficialis
The perineal artery (superficial perineal artery) arises from the internal pudendal artery, and turns upward, crossing either over or under the superficial transverse perineal muscle, and runs forward, parallel to the pubic arch, in the interspace between the bulbospongiosus and ischiocavernosus muscles, both of which it supplies, and finally divides into several posterior scrotal branches which are distributed to the skin and dartos tunic of the scrotum. It supplies the Transversus perinæi superficialis and the structures between the anus and the urethral bulb.

Anus

analperianalanal opening
It supplies the Transversus perinæi superficialis and the structures between the anus and the urethral bulb.

Bulb of penis

urethral bulbbulb of the penisbulb of the urethra
It supplies the Transversus perinæi superficialis and the structures between the anus and the urethral bulb.

Posterior scrotal nerves

Posterior scrotalposterior scrotal nerve
They pierce the fascia of the urogenital diaphragm, and run forward along the lateral part of the urethral triangle in company with the posterior scrotal branches of the perineal artery; they are distributed to the skin of the scrotum or labia and communicate with the perineal branch of the posterior femoral cutaneous nerve.

Erection

erectpenile erectionerect penis
Ultimately, the cause for erectile dysfunction is that not enough nitric oxide (NO) is released by the vascular endothelium of the branches of the perineal artery, a branch of the internal pudendal artery.

Pudendal arteries

pudendal arterypudendal vessels
The internal pudendal artery gives rise to the perineal artery and the inferior rectal artery.

Perineal membrane

inferior fascia of the urogenital diaphragmfibrosainferior
Its base is also perforated by the perineal vessels and nerves, while between its apex and the arcuate pubic ligament the deep dorsal vein of the penis passes upward into the pelvis.

Deep external pudendal artery

external pudendal artery
The deep external pudendal artery (deep external pudic artery), is one of the pudendal arteries that is more deeply seated than the superficial external pudendal artery, passes medially across the pectineus and the adductor longus muscles; it is covered by the fascia lata, which it pierces at the medial side of the thigh, and is distributed, in the male, to the integument of the scrotum and perineum, in the female to the labia majora; its branches anastomose with the scrotal (or labial) branches of the perineal artery.

Arterial tree

arterial branchesdistal descending aorta

Perineum

perinealperineal bodyanogenital