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The first part, next to the urinary bladder, passes through the prostate gland and is called the prostatic urethra. The second part, a short region that penetrates the pelvic floor and enters the penis, is called the membranous urethra. The third part, the spongy urethra, is the longest region.This portion of the urethra extends the entire length of the penis, and the external urethral orifice opens to the outside at the tip of the penis.he final passageway for the flow of urine is the urethra, a thin-walled tube that conveys urine from the floor of the urinary bladder to the outside. The opening to the outside is the external urethral orifice. The mucosal lining of the urethra is transitional epithelium.
In males, the first 1 to 2 of the urethra that urine passes through is called the posterior urethra. The posterior urethra includes: 1  the bladder neck (the opening of the bladder) 2  the prostatic urethra (the part of the urethra by the prostate)  the membranous urethra.