The Pyramidal, so named by reason of its Figure, is situated in the lower Tendon of the Rectus, its Origine being in the upper and external part of the Os Pubis; but it is terminated in the White Line, three Fingers breadth above the Pubes, and sometimes even in the Navel itself. These Muscles are not found in all Bodies for there are sometimes two, sometimes only one, and sometimes none.
The use of the Muscles of the lower Belly is to compress all the contain'd parts, in order to assist them in expelling the Excrements.
How many Muscles are there in the Testicles?
They have each of them one, call'd Cremaster; this Muscle takes its rise from the Ligaments of the Os Pubis, and by the dilatation of its Tendon covers the Testicle, which it draws upward.
How many Muscles hath the Penis?
It hath two Pair, viz. the Erectores or Directores, and the Dilatantes: The Erectores arise from the internal part of the Os Ischion, under the beginning of the Corpora Cavernosa, where they are inserted, and retake their Fibres in their Membranes. The Dilatantes or Acceleratores have their Source in the Sphincter of the Anus and slipping from thence obliquely under the Ureter, are join'd to the Membrane of the Nervous Bodies.
How many Muscles are there in the Clitoris?
It hath two Erectors which spring forth from the Protuberance of the Os Ischion, and are inserted in the Nervous Bodies of the Clitoris. There are also two others suppos'd to be its Elevators, which proceed from the Sphincter of the Anus, and are terminated in the Clitoris.
How many Muscles are there in the Anus?