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Sphincter Vesicae.
THe Urinary Bladder is an Organick Membranous part of the lower Belly,* 1.1 the which is formed as a receiver to take the Urine into it, or Serum which passeth from the Kidneys into it, and at due time doth also serve for a dis∣charge of the same, and so this Bladder hath two Muscles given it, the one is said to retain the Urine in it, the other drives it out; How unkind would Human life be, if it should be con∣tinually attended with a continual dropping of Urine, as also how troublesome would it be to Mankind to be perplexed with as great a stoppage; therefore kind Nature as she hath been so free as to give the Bladder one pair to keep it in whilst it is con∣venient to discharge it, so also hath she been as provident to let it out when the Bounds of Nature commands a discharge thereof: the first from its Office hath gained the name of Sphincter.
This is placed orbicularly in the neck of the Bladder, scarcely distinct from the substance of it, only where you find a round Induration, this is the same, this doth keep the Urine from in∣voluntary falling out from the Bladder, pursing it up.
O. O. Shews this at Tab. 13. Fig. 1.