Normal Anatomy and Physiology

Abstract

This chapter focuses on the human penis and its structure and function. Corporal architecture and vascular anatomy are reviewed in the context of penile physiology and erection. The functional neuroanatomy governing penile erection, flaccidity, emission, and ejaculation is addressed, and attention is given to molecular mechanisms and signal transduction germane to penile erection and flaccidity. Smooth muscle physiology and the major players involved in the regulation of muscle tone are reviewed. This chapter also focuses on the modes of erectile response as well as the relevant central and spinal pathways.