Answer :
Final answer:
The internal structure of the urinary bladder features a unique triangular area called the trigone, formed by the two ureteral openings and the urethral opening. The detrusor muscle constitutes the distensible bladder wall, lined with transitional epithelium, which adjusts shape depending on urine volume, supporting the micturition reflex.
Explanation:
The internal structure of the urinary bladder includes a triangular-shaped area at the base called the trigone. The trigone's borders are formed by the two ureteral openings at the posterior aspect of the bladder and the urethral opening at the base. This area is unique because it is smooth and lacks the folds present in the rest of the bladder interior, allowing for efficient funneling of urine into the urethra. The walls of the bladder are highly distensible, made up of the detrusor muscle, which relaxes to accommodate varying volumes of urine and contracts during urination.
The transitional epithelium lining the interior surface of the bladder wall is made to handle significant volume fluctuations. The bladder can hold approximately 500-600 mL of urine in adults and still maintain its structural integrity due to the transitional cells' ability to change shape. The micturition reflex is a complex process involving voluntary and involuntary actions supported by the bladder's musculature and nervous system control.
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