The cystoscope is one kind of endoscope to use insie the bladder. It have several parts: 1) The optic that could have 0, 12, 25, 30 or 70 dregrees to differents views of the bladder, prostate or urethra. 2) Other part are the sheath .The optic are placed into the sheath. There are varios diammeters of sheaths fron 17 to 15 Fr. 3) The Bridge is the part that connect the optic with the sheath and the optic. 4) The moderns cystoscopes are used with ligth cables to transmit the light into the bladder.