GENERAL HISTOLOGY

Detailed explanation-1: -Your urinary system is made up of the kidneys, the bladder, the ureters and the urethra. The urethra is the hollow tube that lets urine, a waste product, leave the body.

Detailed explanation-2: -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-3: -The spongy urethra is surrounded by the corpus spongiosum and forms the terminal conduit communicating with the outside of the body.

Detailed explanation-4: -The opening to the outside is the external urethral orifice. The mucosal lining of the urethra is transitional epithelium. The wall also contains smooth muscle fibers and is supported by connective tissue. The internal urethral sphincter surrounds the beginning of the urethra, where it leaves the urinary bladder.

Detailed explanation-5: -An outer layer of smooth muscle called the detrusor muscle surrounds the bladder. When your bladder is full, the muscles in the bladder wall can be tightened to squeeze out the urine. As you urinate, the bladder shrinks in size. The bladder wall is made of many layers, including: Urothelium or transitional epithelium.