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Erector Penis, sive Collateralis.
THe Seed made, prepared,* 1.1 and elaborated in the Sperma∣tick Vessels do require a proper Instrument for its discharge into that part which Nature at first designed it for, by which means we see the like produced by the help of this Instrument. Plato in Timaeo did suppose the Penis to be some certain Animal, which could produce such strange effects as touching both Generation and Propagation, but although it is no Animal, yet it must properly be allowed an Animal-part and Instrument: Its placed in the lower part of the Belly, for the more commodious executing its Office, it takes its Original from a strong Foundation, as from the Bones of the Pubis, to whose Root it is most firmly planted; we pass by its Figure and Substance, and come to its Muscles.
This Muscle has his Original from the Appendix of the Coxendix, beneath the beginning of the two Nervous Bodies, in whose Interior part their thickest Fibres do terminate and vanish.
Spigelius doth assert that they take their names from their qualities, and that they do erect the Penis, and in coition do preserve the same; but this is denied by Regnerus de Graaf, as you will see in the next Chapter: for these Muscles rather de∣press the Penis, that so the Seed may be the more straightly eja∣culated into the Ʋterus.
S. S. Shews this at Tab. 13. Fig. 1. T. T. Shews the same, Tab. ead. Fig. 2. G. G. Shews this, Tab. 12.