Physiology of erection

Physiology of erection

The corpora cavernosa are bounded by a tunic (albuginee) which sends septa inside forming a rigid skeleton. Albuginee foam body tunic is made thinner and the pressure inside it is lower. Gland acts as an arterio-venous fistula.

Erection fundamental condition of male sexual response is a hemodynamic phenomenon.

Penile arterial vasculature is most common on penile artery artery becomes shameful internacare after crossing the perineal membrane. Give a short ram penile artery (artery bulb sponge) and then divide the deep artery of the penis (corpora cavernosa irrigation) and superficial dorsal artery (irrigation glans).
Superficial dorsal artery gives branches that pierce the corpora cavernosa and anastomozeaza albugineea with deep artery.
Venous drainage of the three erectile structures is achieved through a system of internal located venules that converge towards albuginee Emissary venules that will be flowing into the deep dorsal vein of the penis that drains into the vein shameful.
Venous drainage of the foreskin and skin of the penis is achieved by superficial dorsal vein of the penis (Bancroft 1989).
 Physiology of erection
modynamic autonomic innervation that controls erection is achieved by sympathetic and parasympathetic nerve fibers.
Parasympathetic stimulation cause vasodilation in the penis and increasing blood flow within the cavernous tissue and the sympathetic is involved in determinism and detumescentei tumescent penis.

Erection reflex is mediated by a reflex center in the sacral spinal cord. Through this mechanism it is possible erection through genital stimulation in men with spinal cord injury above the sacral segments.

Psychogenic erection occurs due to central nervous system integration of olfactory stimuli, visual, auditory but also sexual fantasies and information due to previous experience of the subject.
Direct activator of androgen effect on spinal centers of erection is attested by multiple studies (V.Mogos & E.Zbranca).
 Physiology of erection
Have identified four successive phases of erection hemodynamic (V.Mogos & E.Zbranca):

1. Initial filling phase (latency)-takes 30sec-few minutes and its effect length and girth discreet with increasing pressure intracavernoase.In this phase cavernous artery lumen expands 3 times and enter the corpora cavernosa single in systole and diastole.

2. Tumescent phase which results in length and girth up to its maximum size. Intracavernosal blood pressure increases and exceeds the diastolic pressure. Intracavernosal blood enters only in systole.

3. Full erect penis when appearance is identical to the previous phase but intracavernosal pressure continues to rise, reaching 85% of systolic pressure and arterial and venous blood flow will be reduced.

4. Rigid erection phase occurs during both masturbation and in coitus. In this phase due to voluntary muscle contraction-ischio cavernosa intracavernosal blood pressure rises much higher than the systolic making.