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Penis Pictures, Erection & Flaccid (Soft) Anatomy Photos |
First, the penile nerves are stimulated, to produce a sensation known as sexual arousal.
No matter what the nature of the sexual stimulus. Whether it is visual, mental or physical the brain coordinates the following series of bodily events:
Nerve impulses transverse the length of the spinal cord on to the penis thru the dorsal nerve. Smooth muscle within the walls of the penile arteries respond by relaxing.
[Penile image cross section picture of penis anatomy photo]
Subsequently, the soft flaccid penile arteries dilate allowing up to eight times more blood to flow into the corpora cavernosum, (two parallel cylinders that transverse the length of the penis).
[Image side view picture of hanging flaccid penis anatomy photo]
The cavernosum become engorged with blood expanding and lengthening the penis.
The expanding tissue then exerts a positive pressure compressing the veins that normally empty the blood from the penis, maintaining the blood in the penile tissue.
When penile ejaculation (climax) occurs or when penile arousal is discontinued the penis returns to its non-erect state.[Image side view photo of erect penis anatomy picture]
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