排尿時斜傾位連続レ線間接撮影法による排尿開始時の膀胱運動の研究 第1報:排尿障碍のない場合

Abstract

For the purpose of investigation of changes in the shape of the b l adder, particularly of the bladder neck, at the beginning of micturition, serial fluorographies of it in normal persons have been taken in semilateral position at intervals of four seconds. The shape of the bladder appears to be various while it is at rest : irregularly ovoid, upside down triangular etc. The internal urethral orifice is located, in general, in the posterior one third part of the bladder base. The longitudinal axis of the bladder is inclined in some degree to the horizon (base line). With the beginning of urination the shape of the bladder c hanges into relatively ordinated ellipsoid, the axis of which increases in its inclination, in other words the bladder rises in some extent. The bladder base descends concurrently therewith. The maximum inclination of the bladder axis reaches at maximum at the beginning of urination and then no longer increases thereafter in the course of micturition. In most cases, the internal urethral orifice takes the lowermost position of the bladder at the beginning of urination. The increase in the vertical length o f the bladder seen in the antero-posterior cystogram at the beginning of micturition, which has been accepted to be due to the stronger contraction of the ring muscles of the bladder wall than the longitudinal, is merely the image of the rised bladder projected to the front and not relate the difference of contraction according to the direction of the fibers of the bladder wall. For details reference would be made to the Nagoya Medical Journal Vol. 4. NQ. 1. 1956,