Penile neuronal nitric oxide synthase and its regulatory proteins are present in hypothalamic and spinal cord regions involved in the control of penile erection.
Ferrini MG, Magee TR, Vernet D, Rajfer J, Gonz?lez-Cadavid NF. Penile neuronal nitric oxide synthase and its regulatory proteins are present in hypothalamic and spinal cord regions involved in the control of penile erection. J Comp Neurol. 2003 Mar 24; 458(1):46-61.