The bladder and the brain
Bladder activity is regulated by the brain and our nervous system. The bladder is a sac-like muscle that can stretch and expand as it fills with urine. The network of muscles in the bladder have stretch receptors, which respond when the bladder begins to fill with urine. All the stretch receptors are connected to nerves, which send signals up through the spine to the brain when it is time to urinate. If it’s convenient for a person to do it, then the brain sends the message back that it’s okay to release the urine.
When a person normally feels the urge to urinate, the first reaction is to squeeze the sphincter muscles, lifting the pelvic floor, in order to hold the urine inside the body until it’s convenient to urinate.
An average person urinates 4-8 times per day. It’s important that the bladder is fully emptied regularly because even a small amount of urine left in the bladder for prolonged periods of time can cause urinary tract infections (UTIs).
These are general guidelines meant to help you with typical questions. You should follow the specific instructions provided by your healthcare provider and the intermittent catheterization solution you are using.