The superior upper portion of the male urethra is encircled by the internal urethral sphincter, which is a smooth muscle that helps control the flow of urine from the bladder into the urethra.
The three regions of the male urethra are:Prostatic urethraMembranous urethraspongy urethra
The three regions/sections of the male urethra are:Prostatic UrethraThe prostatic urethra begins at the neck of the bladder and includes all of the section that passes through the prostrate gland. It is the widest and most dilatable part of the male urethral canal.Membranous UrethraThe membranous urethra is the shortest and narrowest part of the male urethra. This section measures approx. 0.5 - 0.75 inches (12 - 19 mm) in length and is the section of the urethra that passes through the male urogenital diaphragm.The external urethral sphincter (muscle) is located in the urogenital diaphragm (as for the female urethra). This muscle is referred to as the "compressor urethrae muscle" in some older textbooks.The passage of urine along the urethra through the urogenital diaphragm is controlled by the external urethral sphincter, which is a circular muscle under voluntary control (that is, it is innervated by the somatic nervous system, SNS).See the page about micturation for more about control of these structures by the nervous system.Spongy UrethraThe spongy urethra is the longest of the three sections. It is approx. 6 inches (150 mm) in length and is contained in the corpus spongiosum that extends from the end of the membranous portion, passes through the penis, and terminates at theexternal orifice of the urethra - which is the point at which the urine leaves the body.
male urethra is long and female urethra is short
urethra
The urethra is the passageway for semen as it leaves the male's body. In the male, the urethra carries semen and urine, while in the female the urethra only carries semen.
The three divisions of the male urethra are the prostatic urethra, the membranous urethra, and the penile (spongy) urethra. Each section serves a specific purpose in the transport of urine and semen.
Urine and Sperm
The urethra is located in the bull's penis, just like in a human male.
The female and male urethra function in the same way for urinary elimination. The female urethra is shorter in length than a male's, with the female urethra approximately 1 1/2 inches long and the male urethra approximately 8 inches long. Therefore, females can be more vulnerable to urinary tract and bladder infections since the pathway for germs from outside the body is shorter in females. Both males and females have sphincter muscles at the base of the bladder that control the release of the urine from the bladder to the urethra. In males, the urethra also functions as a tube for the release of semen in ejaculation. Their urethras intersect with the vas deferens, the tube that moves semen from the reproductive organs, at the area of the prostate gland. A valve at the base of the urethra directs the flow of either urine or semen through the urethral tube.
The male urethra is significantly longer than the female urethra. Unlike the female urethra, it has a function in the reproductive system (carrying semen to the outside of the body) as well as a urinary function (carrying urine to the outside of the body.)
The narrowest part of the male urethra is the external urethral meatus, which is the opening at the tip of the penis where urine and semen exit the body. It is the most constricted part of the urethra and can be prone to blockages or infections.