he anatomy of the bladder forms an
extraperitoneal muscular urine reservoir that lies behind the pubic
symphysis in the pelvis. A normal bladder functions through a complex
coordination of musculoskeletal, neurologic, and psychological functions
that allow filling and emptying of the bladder contents. The prime
effector of continence is the synergic relaxation of detrusor muscles
and contraction of the bladder neck and pelvic floor muscles. (See the
image below.)
Gross anatomy of the bladder.
The normal adult bladder accommodates 300-600 mL of urine; a central nervous system (CNS) response is usually triggered when the volume reaches 400 mL. However, urination can be prevented by cortical suppression of the peripheral nervous system or by voluntary contraction of the external urethral sphincter.
Gross anatomy of the bladder. The normal adult bladder accommodates 300-600 mL of urine; a central nervous system (CNS) response is usually triggered when the volume reaches 400 mL. However, urination can be prevented by cortical suppression of the peripheral nervous system or by voluntary contraction of the external urethral sphincter.
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