See Also: annulus urethralis(medicine)
colliculus urethralis(medicine)
crista urethralis(medicine)
habenula urethralis(medicine)
lacuna urethralis(medicine)
arteria urethralis(medicine)
facies urethralis penis(medicine)
crista urethralis masculinae(medicine)
carina urethralis vaginae(medicine)
crista urethralis femininae(medicine)

instrumentation (iou) and annulus urethralis (medicine)


instrumentation (iou)



instrumentation noun. M19.
[French, formed as INSTRUMENT verb + -ATION.]
The arrangement or composition of Music for particular musical instruments; the instruments used in any one piece of Music. Also (rare), playing on musical instruments. M19.
Operation or provision of means; instrumental agency. M19.
The use of an instrument, esp. for delicate or scientific work; operation with an instrument. L19.
The design and provision of instruments for measurement, control, etc.; such instruments collectively. M20.

annulus urethralis (medicine)


annulus urethralis -->
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.