The video demonstrates that the current concept of total pelvic floor relaxation preceding micturition is only partly correct. It is only the anterior part of pelvic floor which relaxes. The posterior muscles stretch the bladder/urethral smooth muscle backwards to tension it, prior to active opening of the posterior urethral wall by the downward angulation of the anterior border of levator plate by the conjoint longitudinal muscle of the anus. This action expands the diameter of the urethra, vastly reducing the resistance to flow and therefore, the head of pressure required to be generated by the detrusor to empty the bladder.
Corresponding Author: PETROS P.|