Sexual Feedback. Ejaculation is the endpoint of a process that begins with a touch. Skin covering the shaft and glans of the penis is filled with …

Erection of the Penis: Anatomy and Physiology. Anatomy of the Penis (1/2): gross appearance, vascular supply, innvervation, histology. Anatomy of the Penis (2/2): phases of erection, neural control, molecular signaling.

Penis: Penis,, the copulatory organ of the male of higher vertebrates that in mammals usually also provides the channel by which urine leaves the body. The corresponding structure in lower invertebrates is often called the cirrus.

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A stag’s penis forms an S-shaped curve when it is not erect, and is retracted into its sheath by the retractor penis muscle. Some deer species spray urine on their bodies by urinating from an erect penis.

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An erection (clinically: penile erection or penile tumescence) is a physiological phenomenon in which the penis becomes firmer, 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

Fig. 1. Intact adult penis: This illustration represents an average normal adult human penis. The head of the penis (glans) has a covering, called the foreskin (prepuce).

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