Podcast
Questions and Answers
Which tissue covers the superior surface of the outer layer of the urinary system?
Which tissue covers the superior surface of the outer layer of the urinary system?
How many openings are present in the bladder wall?
How many openings are present in the bladder wall?
What type of muscle fiber is the internal urethral sphincter composed of?
What type of muscle fiber is the internal urethral sphincter composed of?
Where is the external urethral orifice located in females?
Where is the external urethral orifice located in females?
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Which structure joins the male urethra within the prostate?
Which structure joins the male urethra within the prostate?
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What type of muscle fiber guards the external urethral orifice in females?
What type of muscle fiber guards the external urethral orifice in females?
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Study Notes
The Urinary System
- The outer layer of the bladder is composed of connective tissue, containing blood vessels, lymph vessels, and nerves, with the superior surface covered by parietal peritoneum.
- The bladder wall has three openings (orifices) that form a trigon.
- The upper two openings are the ureters, located on the posterior wall.
- The lower opening is the point of origin of the urethra.
- The internal urethral sphincter is a thick layer of involuntary smooth muscle fiber at the point of origin of the urethra.
Urethra
- The urethra is a tube lined with mucous membrane that extends from the neck of the urinary bladder to the exterior of the body.
Female Urethra
- The female urethra lies directly behind the symphysis pubis and anterior to the vagina.
- It extends downward and forward from the bladder for a distance of about 3-4cm and opens at the external urethral orifice just in front of the vagina.
- The external urethral orifice is guarded by the external urethral sphincter, which consists of voluntary striated muscle fiber.
Male Urethra
- The male urethra is about 19-20cm long.
- It passes through the prostate gland just after leaving the bladder.
- Within the prostate, it's joined by two ejaculatory ducts.
- The urethra extends down, forward, then up to enter the base of the penis, then travels through the center of the penis and ends as a urinary meatus at the tip of the penis.
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Description
Learn about the structure and components of the urinary system, including the bladder wall and its openings. Understand the role of the internal urethral sphincter and its functions.
