Erection of pinna

Ectopic pinna.

Penile Erection

Hemodynamic Aspects Penile erection and detumescence are primari ly controlled by hemodynamic events. Increased arterial inflow appears to be of primary importance; the contribution of increased venous resistance to the production of penile erection remains controversial. Furthermore, our understanding of precise anatomic details ( including “shunts”) and the neural control of vascular events i...

Mechanisms of Erection

How Common Is It? Kinsey et al reported the results of a survey conducted on 15,781 men. The survey suggested that the prevalence of ED was less than 1% in men under age 30, 6.7% in men between the ages of 45 to 55, and 25% in men above 65 years.3 The Massachusetts Male Aging Study (MMAS) was a cross-sectional community-based randomsample survey in men aged 40 to 70. The study was conducted bet...

Pharmacology of penile erection.

Erection is basically a spinal reflex that can be initiated by recruitment of penile afferents, but also by visual, olfactory, and imaginary stimuli. The reflex involves both autonomic and somatic efferents and is modulated by supraspinal influences. Several central transmitters involved in the erectile control have been identified. Dopamine, acetylcholine, nitric oxide (NO), and peptides, such...

Neural control of erection.

Penile erection is a vascular event controlled by the autonomic nervous system. The spinal cord contains the autonomic preganglionic neurons that innervate the penile erectile tissue and the pudendal motoneurons that innervate the perineal striated muscles. Sympathetic pathways are anti-erectile, sacral parasympathetic pathways are pro-erectile, and contraction of the perineal striated muscles ...