. Surgery, its principles and practice . e factor becomes obstructive also. MALFORMATIONS OF THE BLADDER. 297 The overgrowth of muscular structure shows itself not only in thicken-ing of the wail of the bladder as a whole, but also in the numerous bands ofmuscular fibers that criss-cross the inner w^alls in every direction; thatmight aptly be called columnse vesicae, in imitation of the term appliedto the interior of the hypertrophied heart. In the interspaces between such bands of muscles unresisting spacesare left that receive the counterpressure of the urine at each expulsiveeffort; gradual
. Surgery, its principles and practice . e factor becomes obstructive also. MALFORMATIONS OF THE BLADDER. 297 The overgrowth of muscular structure shows itself not only in thicken-ing of the wail of the bladder as a whole, but also in the numerous bands ofmuscular fibers that criss-cross the inner w^alls in every direction; thatmight aptly be called columnse vesicae, in imitation of the term appliedto the interior of the hypertrophied heart. In the interspaces between such bands of muscles unresisting spacesare left that receive the counterpressure of the urine at each expulsiveeffort; gradually these dilate and form pockets, small for a time, butfinally growing into sacculi or diverticula, with the continuation of theobstruction and backward pressure. The two forms of hypertrophy described above usually require differ-ent measures for their relief: removal of the obstruction, for the eccentricform, and removal of the source of irritation, for the concentric. Urethral stricture and prostatic hypertrophy are the most frequent.
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