label: urorectal septum
label_lc: urorectal septum
description: "The urorectal septum (urs) (TS:19-TS:27) is the mesenchyme located between the hindgut (dorsal) and urogenital sinus (ventral) (TS:19-21) and later the colon/rectum and bladder/urethra. Derived from mesoderm."