MICROANATOMY

Detailed explanation-1: -Urethra. This tube allows urine to pass outside the body. The brain signals the bladder muscles to tighten, which squeezes urine out of the bladder. At the same time, the brain signals the sphincter muscles to relax to let urine exit the bladder through the urethra.

Detailed explanation-2: -The membranous urethra travels through the external urethral sphincter, while the spongy urethra travels the length of the penis and terminates at the meatus at the tip of the sexual organ.

Detailed explanation-3: -The urethra is a thin, fibromuscular tube that begins at the lower opening of the bladder and extends through the pelvic and urogenital diaphragms to the outside of the body, called the external urethral orifice.