Illustrations in transverse section of the periprostatic nerve distribution at the (A) base of the prostate; (B) midprostate; (C) apex of the prostate; and (D) membranous urethra. Nerves fibres are found in the posterolateral (post. lat.) neurovascular bundles (NVBs) and anterolateral (ant. lat.) to the prostate (P) between the prostate fascia (PF) and the visceral endopelvic fascia (VEF). The anterolateral fibres continue towards the corpora cavernosa, forming the cavernous nerves (CNs); the posterolateral fibres reach the corpus spongiosum, forming the corpus spongiosum nerves (CSNs).CS = colliculus seminalis; DA = detrusor apron; EUS = external urethral sphincter; IUS = internal urethral sphincter; LA = levator ani; OM = obturator muscle; P = prostate; PC = prostate capsule; PEF = parietal endopelvic fascia; SV = seminal vesicles; VD = vas deferens; VP = venous plexus of Santorini.