Why are the muscles of the urinary bladder involuntary

Function of the urinary bladder

The urinary bladder serves as a temporary storage organ for the urine constantly produced by the kidneys. The urinary bladder enables us to deliberately release the urine at certain time intervals. The bladder itself consists of a spherical muscular part (detrusor muscle), which should enable the bladder to be completely emptied. The inner lining of the urinary bladder is made up of a special mucous membrane called the urothelium. The bladder is well protected in the bony pelvis.

The urine is transported from the kidneys via the ureters into the bladder and finds its entrance into the bladder in the area of ​​the so-called ostia (ureter openings). The so-called sphincter muscle prevents involuntary emptying of the urinary bladder, whereby an internal and an external sphincter are distinguished. The external sphincter can be controlled at will. When urinating (micturition), the urine is passed through the urethra (urethra).

The mean filling volume of a healthy urinary bladder is usually between 300 and 500 ml, depending on the gender and the individual.