Abstract
Corpora cavernosa from humans and other mammals relax to transmural stimulation, and these relaxations are sensitive to voltage-gated sodium channel blockers such as tetrodotoxin (TTX). Snakes and lizards are unique among amniote vertebrates in having a bilaterally symmetrical intromitteny penis, known as hemipenises. The transmural stimulation of Crotalus durissus terrificus hemipenises …