The Vasa Deferentia are Vessels seated partly in the Scrotum, and partly in the Abdomen; they convey the Seed by drops to the seminal Vesicles; the two extremities of the Vasa Deferentia are compar’d to a Bunch of Grapes, and Guts of Birds.
Two small Ducts of about an Inch in length, spring from these Vesicles; they are broad near the Vesicles, but dwindle as they approach to the Urethra, which they perforate. These Ducts are call’d Ejaculatory Vessels, because in the heat of Action, they throw the Seed of the Vesicles into the Urethra, and they are the chief Subjects of the pleasure attending Ejaculation.
These small Ducts have ten or twelve Orifices, opening to the Urethra, each of them being shut by a small Caruncle to prevent the continual efflux of Humour, which has the precedency of the Seed. This is alledg’d to be the seat of a Clap, by reason volatile Salts fastning near, occasion Ulcers that corrode the Caruncles, and thereupon the Orifices of the Ducts discharge their slimy Liquor.
The Prostatæ are two Glandulous spungy Bodies, seated at the root of the Yard, by the head of the Urethra, and furnish’d with Arteries from the Pudendæ; their use is to make a secretion of slimy oily Liquor out of the Blood, to reserve it for some time in its Vesicles, and to squeeze it out by degrees, thro’ the Pipes of the small Ducts, to the Urethra.
’Tis reported, that some Persons have three Testicles, and that others are so slenderly provided, as to have but one; tho’ either of the cases happens very rarely. And Animals which have their Testicles situated within, are always accounted more lascivious than others.
There are four spermatick Vessels belonging to the Privy Parts of a Man, two whereof are Arteries, and the other two Veins. The two spermatick Arteries spring from the Trunk of the Aorta; and run obliquely upon the Ureters, and along the Muscle Posas, ’till they arrive at the Groin, where they are receiv’d by a production of the Peritonæum, and so conducted to the Testicles.
The two spermatick Veins branch out from the Testicles towards the Vena Cava. The Right extends it self straight to the Trunk of the Cava; but the Left terminates in the emulgent Vein. In their progress, they are join’d by small Veins from the Peritonæum, and the neighbouring Muscles, which are loaded with the superfluous Blood of those parts, in order to lodge it in the Cava.
The spermatick Vessels are larger in Men than Women; and in both Sexes the Arteries are always stronger than the Veins. For the use of these Vessels, the Blood runs in the two Arteries straight to the Testicles, each of them dividing into two small Branches, the better to penetrate its Substance, by entring at several places, and to procure an exact separation of the seminal Particles, that accompany the Arterious Blood. And when this is perfected, the remainder of the Blood enters the Branches of the Veins, in order to return to the Cava.
The Valves in the Cavity of the Veins are plac’d at certain Intervals, in order to prevent the Arterious Blood from falling down. They are serviceable in promoting the ascent of the Blood, and their natural Disposition conducts it to the Vena Cava.