Corpus: Internal urethral orifice
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Synonyms: internal urethral opening, ostium urethrae internum, orificium urethrae internum
English: inner urethral ostium
Definition[Bearbeiten]
Meatus urethrae internus or Ostium urethrae internum is the term used to describe the inlet opening of the urethra (urethra) to the bladder, i.e. the inner opening of the urethra.
Anatomy[Bearbeiten]
The internal urethral meatus is located at the tip of the trigonum vesicae, in the most caudal part of the urinary bladder, the fundus vesicae urinariae. It is closed by a sphincter muscle, the internal urethral sphincter muscle.
The internal urethral meatus is one of three physiological constrictions of the urethra.