Is the penis a muscle or an organ?

Joseph Hopper is correct—it's not a muscle. It consists mostly of three long columns of spongy tissue full of tiny spaces called blood sinusoids. read more

It's an organ. The definition of organ is a system made up of tissue operating together to perform a function. The penis is an organ made up of muscle tissue, along with blood vessels, nerve fibers and so on. It performs a distinct function, therefore it's an organ. read more

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