Understanding
diseases of aging:
ageless woman
Errors in menopause
treatment
Function of
the
bladder neck
The normal bladder neck musculature opens actively the posterior
urethra when voiding (green arrows).
The bladder neck is known in the medical literature, even in
medical books of great value, as the inner sphincter. As a
sphincter is a muscular structure contracted around a natural
orifice (red arrows) the bladder neck is not a sphincter.
Surrounding a natural orifice, it is not contracted and
its contraction leads to the opening
of its natural orifice on the contrary of a sphincter!
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