Urinary Bladder -
- It is situated in the pelvic cavity and is lined with the transitional epithelium.
- The bladder is partially retroperitoneal (outside the peritoneal cavity) with its peritoneal-covered “dome” projecting into the abdomen when the bladder is distended with urine.
- The muscular layer of the urinary bladder is called the detrusor muscle.
- The detrusor muscle is made up of three layers of smooth muscles as inner and outer layers of longitudinal fibres and middle layer of circular fibres.
- The area where the bladder and urethra join contains internal sphincter formed by the modification of the circular muscles.
- It allows urine into the bladder but prevents reflux of urine from the bladder back into the ureter.
- Internally, the bladder has a triangular area called the trigone formed by three openings - two openings through which the ureters open into the bladder and one opening through which the urethra leaves the bladder.
-The muscular layer of the urinary bladder is called the detrusor muscle. Hence, the correct option is detrusor muscle
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