bladder
The
normal function of the bladder is to store and expel urine in a coordinated,
controlled fashion. This coordinated activity is regulated by the
central and peripheral nervous systems. But what happens when the
bladder malfunctions as a result of dysfunction, trauma, disease or
injury? The information below should help you recognize this problem
before it causes serious damage.
What happens under normal conditions?
The urinary bladder,
a spherical organ, has a soft inner lining (similar to the inner cheek)
and an outer muscle layer. In addition to the bladder, the bladder
neck (funnel-like outlet of the bladder which leads to the urethra),
the urethra (tube-like structure which serves as a channel to carry
urine from the bladder to the external surface) and the external urethral
sphincter muscle (group of muscles which surround the urinary passage
below the bladder neck) complete the lower urinary tract.
The muscles and
nerves of the urinary system must function in a coordinated fashion
with the bladder in order to perform its two major functions of storage
and elimination of urine. Nerves carry messages from the bladder to
the brain and then from the brain to the muscles of the bladder telling
them to either tighten or release, allowing the bladder to empty during
urination.
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