urogenital sinus

noun

plural urogenital sinuses

1

: the ventral part of the embryonic mammalian cloaca that is formed by the growth of a fold dividing the cloaca where the hindgut and allantois meet and that eventually forms the neck of the bladder and some parts of the urinary and reproductive systems

2

: a rare urogenital abnormality in which the urethral and vaginal tracts open into a common channel and share a single opening

Word History

First Known Use

1868, in the meaning defined at sense 1

Medical Definition

urogenital sinus

noun

1

: the ventral part of the embryonic mammalian cloaca that is formed by the growth of a fold dividing the cloaca where the gut and allantois meet and that eventually forms the neck of the bladder and some of the more distal portions of the genitourinary tract

2

: a rare urogenital abnormality in which the urethral and vaginal tracts open into a common channel and share a single opening