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Erection - Wikipedia vascular flow in adult penis

It takes patience and favourable imaging conditions (like thin abdominal wall and patient cooperation) to locate the renal arteries and veins by color doppler and even more difficult to get a spectral waveform tracing of the vessels.

An erection (clinically: penile erection or penile tumescence) is a physiological phenomenon in which the penis becomes firm, engorged, and enlarged. Penile erection is the result of a complex interaction of psychological, neural, vascular, and endocrine factors, and is often associated with sexual arousal or sexual attraction, although erections can also be spontaneous.

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