Just as the Almighty Creator created a common container for feces, collecting all the feces until it accumulates, so that it rushes out from there all at once and there is no need for constant minute-by-minute defecation, as you learned about this in your place, the Almighty also prepared created a cavity and a sac for the leaking excess watery part of the blood, subject to expulsion and eruption. This organ collects the whole or the greater part of such excesses and then carries them out at one time, so that there is no need to excrete them continuously, as is the case with those suffering from urination in drops. This cavity is the bladder. It is created sinewy, from tendons-ligaments, in order to be stronger and, along with strength, have the ability to stretch and expand, stretching when filled with aqueous humor. And having been filled, he releases what is in him by the action of the will, prompted by necessity. In the neck of the bladder there is a sensitive fleshy ring, through which the bladder comes into good contact with the muscle.
The bladder consists of two layers, and the inner layer, in depth, is twice as thick as the outer one, since it is it that comes into contact with acute aqueous humor. The Creator, in his wisdom, arranged it so that aqueous humor is attracted into the bladder and extracted from it. He brought two ureters from the kidneys to the bladder and, bringing them there, divided the bladder into two layers; The ureters go between the layers and first penetrate the first layer, piercing it through, then pass between the layers for quite a considerable distance, and after that they go deeper into the inner layer and, perforating it, reach the cavity of the bladder, into which excess aqueous humor is poured out. When the bubble is filled and stretched, the inner layer closes so closely with the outer one, rising to it from below, from the depths, that both of them seem to be one layer in which there is no gap. As a result, aqueous humor and urine do not return back into the ureters when the bladder is stretched. Then the Creator, great is his power, created a neck at the bladder that pushes watery moisture to the penis, tortuous, with many bends, due to which the moisture does not flow out of the bladder all at once. The cervix is especially tortuous in men: in them it has three bends, and in women it has one bend, since in women the bladder is close to the uterus. The beginning of the neck is surrounded by a muscle covering it, which, as it were, suffocates and compresses the neck, preventing moisture from leaving the bladder except with the participation of the will. The will, as you learned in your place, relaxes this muscle with the help of the abdominal muscles, unless the bladder muscle is damaged. On each side of the bladder there are quite large nerves, as well as resting and beating vessels, and there are many nerves in it so that the sensitivity that causes it to stretch and stretch is stronger.