Medical Definition of Internal urethral sphincter

1. 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. (05 Mar 2000)

Lexicographical Neighbors of Internal Urethral Sphincter

internal spermatic fascia
internal sphincter muscle of anus
internal spiral sulcus
internal squint
internal strabismus
internal surface
internal surface of frontal bone
internal surface of parietal bone
internal thoracic artery
internal thoracic lymphatic plexus
internal thoracic plexus
internal thoracic vein
internal traction
internal urethral opening
internal urethral orifice
internal urethral sphincter (current term)
internarial
internasal
internasal suture
internasal suture
international
International
Internationale
internationalisation
internationalise
internationalism
internationalist
internationalistic
internationality
internationalization

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