See Also: sphincter muscle of urinary bladder(medicine)
detrusor muscle of urinary bladder(medicine)
urinary bladder(medicine)
Urinary bladder(health)
serosa of urinary bladder(medicine)
mucosa of urinary bladder(medicine)
body of urinary bladder(medicine)
fundus of urinary bladder(medicine)
apex of urinary bladder(medicine)
neck of urinary bladder(medicine)

sphincter muscle of urinary bladder (medicine)


sphincter muscle of urinary bladder -->
sphincter vesicae


The complete collar of smooth muscle cells of the neck of the urinary bladder which extend distally to surround the preprostatic sportion of the male urethra. There is not a comparable structure in the neck of the femoral bladder; the internal urethral sphincter may exist to prevent reflux of semen into bladder.

Synonym: annulus urethralis, internal urethral sphincter, musculus sphincter vesicae, preprostate urethral sphincter, proximal urethral sphincter, sphincter muscle of urinary bladder.