Functional Neuroanatomy Of Penile Function

Ischiocavernosus Erection

Parasympathetic and Nonadrenergic and Noncholinergic Outflow Parasympathetic preganglionic input to the human penis originates in the sacral S2-S4 spinal cord 30 . In most men, S3 is the main source of erectogenic fibers, with a smaller supply provided by either S2 or S4. These preganglionic neurons are situated in the intermediolateral cell column and send dendritic projections to laminae V, VII, IX, and X of the spinal cord. These distributions for axonal processes imply that sacral...

Central Mechanisms Of Penile Erection And Flaccidity

The cortex receives sensory information from the penis and genitalia. Stimulation of thalamic and cortical areas associated with somatomotor pathways elicits sexual feelings and genital sensations but does not lead to penile erection. Conversely, stimulation of cortical-subcortical areas linked to the limbic system elicit penile erections in response to stimulation, as demonstrated in monkeys 5,171-173 . Direct study of the human brain is limited to observations made during neurosurgical...

Functional Vascular And Microscopic Anatomy Of Penile Erection

Colles Fascia Scrotum

Three spongy cylinders comprise the human penis the paired corpora cavernosa runs dorsolaterally and the corpus spongiosum runs ventrally. Incomplete septa between the corpora cavernosa allow for neurovascular communication, allowing the two bodies to function physiologically and pharmacologically as a single unit. The three corporal bodies are enveloped by a dense fascial structure known as the tunica albuginea. The deep fascia Buck's fascia ofthe penis surrounds the outside ofthe tunica...