The second sticking close to the former, is altogether full of whitish Glandules, that serve to separate the serous Particles of the Blood.
The third is intirely Musculous, and interwoven with Annular Fibres.
The fourth is very thin, and hath its Fibres all streight.
Whence proceeds the Pulse or beating of the Arteries?
It is deriv'd from the Heart, and exactly answers to its Motion of Diastole and Systole.
By what Name is the first Trunk of the Arteries call'd, and what is the Effect of the Distribution made thence to the whole Body?
The first Trunk of the Arteries is nam'd Aorta, or the thick Artery, which proceeds immediately from the left Ventricle of the Heart, whereto it communicates before its departure from the Pericardium, one or two small Branches call'd the Coronary: Afterward it is divided into two Branches, whereof one goes upward, and is term'd the Ascending Artery; and the other downward, under the Denomination of the Descending Artery.
The Ascending Artery ariseth upward along the Aspera Arteria or Wind-Pipe, to the Clavicles, and is there divided into two Branches, call'd the Subclavian Arteries, one whereof goes forward to the Right side, and the other to the Left; and they both send forth on each side
divers Branches, which take their Names from the several Parts, whereto they are distributed; such are the Carotides or Soporales Interni & Externi, which pass to the Head; the Mediastina; the Intercostal; the Axillar, and others.
The Descending Artery, before its departure from the Breast, affords certain Branches to the Pericardium, Diaphragm, and lower Ribs; afterward it penetrates the Diaphragm, and constitutes seven double Branches. The first is of those that are call'd Cœliack, and which go to the Liver and Spleen. The second Branch contains the Upper Mesenterick. The third the Emulgent, which pass to the Reins. The fourth the Spermatick, which are extended to the Genitals. The fifth the Lower Mesenterick. The sixth the Lumbar. And the seventh the Muscular. But assoon as the great Trunk is come downward to the Os Sacrum, it divides it self into two thick Arteries nam'd the Iliack, which are distributed on both sides, each of them making two Internal and External Branches, which likewise impart Sprigs or lesser Arteries, to the Bladder, Anus, Matrix, and other adjacent Parts: Then the Master-Branch forms the Crural Arteries on the inside of the Thighs, which are communicated by multiplying their Number even to the ends of the Toes, in passing over the External Ancle-Bones of the Feet.