GENERAL HISTOLOGY

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 urinary tract is composed of the paired ureters (YOOR-eh-terz), the urinary bladder, and the urethra (yoo-REE-thrah). Urine leaves each kidney through one of the two ureters, tubes that run along the posterior body wall, connecting the kidneys with the hollow urinary bladder.

Detailed explanation-3: -Although the male urethra is a single structure, it is composed of a heterogeneous series of segments: prostatic, membranous, and spongy.

Detailed explanation-4: -Trigone. The trigone is a triangular muscular structure located between the bladder and urethra. Effective connection between the ureters and the trigone are vital for proper functioning of the ureteral valve mechanism.

Detailed explanation-5: -The internal urethral sphincter regulates involuntary control of urine flow from the bladder to the urethra, and the external urethral sphincter provides voluntary control of urine flow from the bladder to the urethra.