During TURP surgeon takes care to dissect above the verumontanum to prevent injury to
External urethral sphincter
Urethral crest
Prostatic utricle
Trigone of bladder
TURP Damage to the external sphincter is avoided provided one uses the verumontanum as a guide to the most distal point of the resection/vaporisation/enucleation. Ref: Bailey and love 27th edition Pg no : 1465
Urology