Anatomía del sistema urinario masculino

The stratified squamous epithelium lines the navicular fossa.

The external urethral sphincter muscle controls the flow of urine from the bladder to the urethra.

The Littré glands are scattered throughout the urethra and secrete mucus to lubricate the urethra.

The spongy urethra, the longest part of the urethra, measures 15 cm in length.

The bulb of the penis is an expansion of the urethral lumen, serving as a reservoir for urine.

The juxtaglomerular apparatus (JGA) is a specialized structure in the kidney responsible for producing and secreting renin.

Angiotensin II increases systemic blood pressure, particularly the systolic pressure.

Angiotensin II stimulates the thirst mechanism, increasing water intake, and promotes water reabsorption in the kidneys.

Angiotensin I is converted to angiotensin II by angiotensin-converting enzyme (ACE) found in the cells lining blood vessels.

Angiotensin II increases the reabsorption of sodium chloride (NaCl) in the collecting ducts of the kidneys, resulting in increased blood volume and pressure.

Angiotensin II exerts its effects by binding to specific receptors called angiotensin II receptors on cell membranes. These receptors are coupled to G proteins, which activate signaling pathways leading to various cellular responses.

The urethra is surrounded by striated muscle in the urogenital diaphragm, allowing voluntary control over urination.

The main function of the urethra is to transport urine from the bladder to the external environment.

The lining of the female urethra is predominantly stratified squamous epithelium, providing a protective barrier.

The female urethra is relatively short and narrow, measuring 5 to 6 mm in diameter.

The posterior wall of the prostatic urethra contains the seminal colliculus, a small elevation that contains the openings of the prostatic utricle and the ejaculatory ducts.

The membranous urethra is the shortest segment of the urethra, measuring only 1 to 2 centimeters in length.