Is the penis an organ

The penile morphology of some types of strepsirrhine primates has provided information about their taxonomy. Hyman's Comparative Vertebrate Anatomy. There is only one spine on the papilla nipple-like projection on the upper side of the penis. Those who measured their penises after oral sex or intercourse sported larger penises than those who relied on fantasy alone, the study found. Much more significantly, it would be a strange kind of courage that could be reduced to a quivering, whimpering puddle of sludge by sitting down too quickly in the wrong underwear. Archived from the original on September 5, Handbook of the Birds of the World.

The male copulatory organ of various lower invertebrate animals is often called the cirrus. The most researched human penis adaptations are testis and penis size , ejaculate adjustment and semen displacement. Not all erections were created equal. Memorial Hermann Penile anomalies Very rarely, a man may be born with two penises, a condition that affects every 5 million to 6 million males and is known as diphallus. In Drymoreomys , there are three digits at the tip of the penis, of which the central one is the largest.

Another evolutionary theory of penis size is female mate choice and its associations with social judgements in modern-day society. The male tinamou has a corkscrew shaped penis, similar to those of the ratites and to the hemipenis of some reptiles. The following list of medical conditions have 'Penis' or similar listed as an affected body part in our database: Archived from the original on February 6, Image showing innervation and blood-supply of the human male external genitalia.

The ecology and conservation of large African mammals. Horace; Rossdale, Peter D. Most marsupials, except for the two largest species of kangaroos and marsupial moles [] assuming the latter are true marsupials , have a bifurcated penis , separated into two columns, so that the penis has two ends corresponding to the females' two vaginas. Is the male organ called penis considered a muscle? A number of invertebrate species have independently evolved the mating technique of traumatic insemination where the penis penetrates the female's abdomen and deposits sperm in the wound it produces. Protrusion is not affected much by erection, but more by relaxation of the retractor penis muscle and straightening of the sigmoid flexure. Veterinary Genetics and Reproductive Physiology.