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Retrieved 7 July Parasympathetic branches extend from the sacral plexus into the arteries supplying the erectile tissue; upon stimulation, these nerve branches release acetylcholine , which, in turn causes release of nitric oxide from endothelial cells in the trabecular arteries. Look up penis in Wiktionary, the free dictionary. An unusual aversion to the erect penis is sometimes referred to as phallophobia. Such an erection is medically known as nocturnal penile tumescence informally: An increase in penile curvature can be caused by Peyronie's disease. The cerebral cortex can initiate erection in the absence of direct mechanical stimulation in response to visual, auditory, olfactory, imagined, or tactile stimuli acting through erectile centers in the lumbar and sacral regions of the spinal cord.

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A penis which is partly, but not fully, erect is sometimes known as a semi-erection clinically: Archived from the original on

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Wikimedia Commons has media related to Erect mammal penis. Are ducks impressed by drakes' display? Some errors occurred, please try again later. Anatomical terminology [ edit on Wikidata ]. In the presence of mechanical stimulation, erection is initiated by the parasympathetic division of the autonomic nervous system with minimal input from the central nervous system. Retrieved 5 December

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