An erection requires the sophisticated interaction of muscles, nerves, substances, and blood vessels that operate in coordination to engorge the penis with blood, which includes: The foundation is made up of the two muscles (ischiocavernosus and bulbospongiosus muscles) and proximal expansions in the erectile tissues; The 2 crura of penis https://bookmarknap.com/story10094331/service-no-further-a-mystery