Penile Erection


Erection, Penile

Nocturnal Penile Tumescence

Penile Tumescence

Penile Tumescence, Nocturnal

Tumescence, Nocturnal Penile

Tumescence, Penile

The state of the PENIS when the erectile tissue becomes filled or swollen (tumid) with BLOOD and causes the penis to become rigid and elevated. It is a complex process involving CENTRAL NERVOUS SYSTEM; PERIPHERAL NERVOUS SYSTEMS; HORMONES; SMOOTH MUSCLES; and vascular functions.