THORAX ABDOMEN AND PELVIS

Detailed explanation-1: -The internal urethral orifice is placed at the apex of the trigonum vesicæ, in the most dependent part of the bladder, and is usually somewhat crescentic in form; the mucous membrane immediately behind it presents a slight elevation, the.

Detailed explanation-2: -The fundus is the base of the bladder, which is formed by the posterior wall and contains the trigone of the bladder, and is lymphatically drained by the external iliac lymph nodes.

Detailed explanation-3: -The IUS is located at the inferior end of the bladder and the proximal end of the urethra. The IUS also lies at the junction of the urethra with the urinary bladder and is a continuation of the detrusor muscle.