|
TA98 Latin preferred term
|
ostium urethrae internum
|
|
TA98 English equivalent
|
internal urethral orifice
|
|
TA98 English synonym
|
internal urinary meatus
|
 Female gender
|
This entity is female gender-specific.
|
 Immaterial
|
This entity is an immaterial object (no mass).
|
|
TA98 correction note
|
In the published book (Thieme 1998), one entry, listed under urethra masculina in chapter 09 had a reference TA code (A08.3.01.028) that did not appear in the expected position in chapter 08. The missing entity in chapter 08, which has been restored, was the ostium internae of the urethra feminina, the female homologue of the ostium internae of the urethra masculina. Because both entities have the same name in Terminologia Anatomica, gender symbols were added to distinguish between the two entities.
|
|
TA98 footnote
|
Ostium urethrae internum This term describes the opening of the urethra from the bladder. However, superimposed lateral cystograms and voiding cystourethrograms show that the ostium in the bladder that is filling differs from the ostium in the bladder that is voiding. The bladder around the ostium urethrae accipiens usually forms a flat disc or baseplate, the pars intramuralis urethrae (bladder neck) is closed and the urethra is at its longest. With the onset of voiding the baseplate becomes progressively funnel-shaped and the bladder neck opens and becomes incorporated into the funnel so that the bladder appears to descend and the urethra to shorten. The ostium urethrae internum evacuans then lies some 20% closer to the ostium urethrae externum in the female, and at the basis prostatae in the male.
|
