The _Matrix_, _Uterus_ or Womb, is the principal Organ of Generation, and the place where it is perform'd, resembling the Figure of a Pear with its Head upward, and being situated between the Gut _Rectum_ and the Bladder: It is of a fleshy and membranous Substance, retain'd in its place by four Ligaments, fasten'd to the bottom; whereof the two upper are large ones, proceeding from the Loins, and the two lower round, taking their Rise from the Groin, where they form a kind of Goose-Foot, which is extended to the _Os Pubis_, and the flat part of the Thighs; which is the cause that Women are in danger of Miscarrying when they fall upon their Knees. The Exterior Neck of the Womb, call'd _Vagina_, is made almost in form of a Throat or Gullet, extending it self outwardly to the sides of the Lips of the _Pudendum_, and being terminated inwardly at the internal Orifice of the _Matrix_, the shape whereof resembleth that of the Muzzle or Nose of a little Dog. The outward Neck of the womb is fasten'd to the Bladder and the _Os Pubis_ before, and in the hinder part to the _Os Sacrum_: Between the Lips of the _Pudendum_ lie the _Nymphæ_, which are plac'd at the Extremity of the Canal of the Bladder, to convey the Urines; and somewhat farther appear four Caruncles, or small pieces of Flesh, at the Entrance of the _Vagina_, which when join'd together make the thin Membrane call'd _Hymen_. * * * * * {77} CHAP. XIV. _Of the Anatomy of the _Thorax_, Breast, or middle _Venter_._ _What is the Breast?_ It is a Cavity in which the Heart and the Lungs are principally enclos'd. _What is to be consider'd outwardly in the Breast?_ Its extent, and the situation of the Parts therein contain'd. _What is its extent?_ It is extended from the _Clavicles_ to the _Xiphoides_, or Sword-like Cartilage on the fore-part, and bounded on the hinder by the twelfth _Vertebra_ of the Back, having all the Ribs to form its Circumference, and the Diaphragm for its Bounds at bottom, separating it from the _Abdomen_ or lower Belly. _What is the situation of the Parts contain'd in the Breast?_ The Lungs take up the upper Region, and fill almost the whole Space, descending at the distance of two Fingers breadth from the Diaphragm; the Heart is situated in the middle, bearing its Point somewhat towards the Left side, under the Lobes of the Lungs, which are divided by the _Mediastinum_ that distinguishes them into the Right and Left Parts. _How is the Breast Anatomiz'd or open'd?_ {78}