Internal trigone of urinary bladder develops from:-
The entire mucosa of urinary bladder except the internal trigone develops from endoderm of vesicourethal pa of cloaca. The internal trigone is developed from the mesoderm by incorporation of caudal pas of the mesonephric ducts.
Ectoderm
Endoderm
Mesoderm
Any of above
Development of GU system and Neuro-vascular supply of pelvis & perineum