Penile Erection
Synonyms
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.