Urinary System Anatomy and Function: Kidneys, Ureters, Bladder, and Urethra

What are the basic functions of the urinary system?

1. Filtration of blood to remove metabolic waste. 2. Transportation of urine. 3. Storage of urine.

What is the primary function of the kidneys?

To filter and remove aqueous waste from bodily fluids.

Name the four main organs of the urinary system.

Kidneys, ureters, urinary bladder, urethra.

Where are the kidneys located in relation to the vertebrae?

Lateral to T12-L3 vertebrae and protected by the floating ribs.

Why is the right kidney positioned lower than the left?

The liver causes the right kidney to sit lower.

What is the renal hilum?

The concave or inward-curved area on the medial side of the kidney.

What are the support tissues of the kidneys?

1. Renal fascia. 2. Perirenal fat capsule. 3. Renal (fibrous) capsule.

What is nephroptosis?

A condition where the kidney descends more than two vertebral bodies when moving from supine to standing.

What is the renal cortex?

The superficial glandular layer of the kidney that contains nephrons and blood vessels.

What structures are found in the renal medulla?

Renal pyramids and renal columns.

What is the function of the renal pelvis?

It is the funnel-shaped tube that eventually becomes the ureter.

Describe the flow of urine through the kidney.

Minor calyx → major calyx → renal pelvis → ureter.

What are the paired renal arteries responsible for?

They supply blood to the kidneys from the abdominal aorta.

Why is the left renal vein longer than the right?

The left kidney sits higher, requiring a longer vein to reach the inferior vena cava.

What is the role of the ureters?

To carry urine from the kidneys to the urinary bladder.

What prevents backflow of urine from the urinary bladder?

The ureters are squeezed flat when the bladder is full.

Where is the urinary bladder located?

Retroperitoneal, on the pelvic floor posterior to the pubic symphysis.

What is the trigone in the urinary bladder?

The triangular area formed by the ureteral openings and the internal urethral orifice.

What is the function of the internal urethral sphincter?

To control the release of urine from the bladder.

Where does the anterior corner of the urinary bladder attach?

At the top edge of the pubic symphysis, where the urachus attaches to the front body wall.

What is the primary function of the urinary bladder?

To temporarily store urine.

How does the male urinary bladder differ from the female urinary bladder?

The male bladder is larger and located anterior to the rectum, while the female bladder is anterior and inferior to the uterus.

What are rugae in the urinary bladder?

Folds in the mucosa lining that allow the bladder to expand.

What is the length of the female urethra?

3-4 cm in length.

What is the external urethral orifice?

The opening through which urine exits the body, located anterior to the vaginal opening and posterior to the clitoris in females.

Why are women more susceptible to urinary tract infections (UTIs)?

Due to a shorter urethra compared to men, which allows fecal bacteria to enter the urethra more easily.

What are common causes of urinary tract infections?

Improper toilet habits, such as wiping back to front after defecation, and sexual activity that drives bacteria toward the urethra.

What is the length of the male urethra?

Approximately 20 cm in length.

What are the three parts of the male urethra?

Prostatic urethra, membranous urethra, and spongy (penile) urethra.

What surrounds the prostatic urethra?

The prostate gland.

What is the role of the internal urethral sphincter?

It is a smooth muscle at the bladder-urethra junction controlled by the autonomic nervous system.

What is the role of the external urethral sphincter?

It is a skeletal muscle that surrounds the urethra and is part of the pelvic diaphragm.

What muscle serves as a voluntary constrictor of the urethra?

The levator ani muscle.

What is the function of the deep transverse perineal muscle?

It supports pelvic organs and constricts the openings of the vagina or prostate.

What structures create the trigone of the bladder?

The openings of the two ureters and the urethra.

What are the support tissues of the kidney?

Adventitia, perirenal fat, and renal fascia, each providing structural support and protection.

What is the function of the coccygeus and levator ani muscles?

They seal the inferior opening to the pelvis and support pelvic organs.

What is the significance of the renal circulation flow chart?

It illustrates the blood vessels that move blood into and out of the kidney.

What are the main functions associated with the urinary system?

To filter blood, remove waste, and regulate fluid and electrolyte balance.

Which organs of the urinary system are intraperitoneal?

The bladder is considered intraperitoneal in females.

Which organs of the urinary system are retroperitoneal?

The kidneys and ureters are retroperitoneal.

What is the difference in urethra structure between males and females?

The male urethra is longer and serves both urinary and reproductive functions, while the female urethra is shorter and serves only urinary functions.