SUBSECT. II.—Division of the Body, Humours, Spirits.
Of the parts of the body there may be many divisions: the most approved is that of [953]Laurentius, out of Hippocrates: which is, into parts contained, or containing. Contained, are either humours or spirits.
Humours.] A humour is a liquid or fluent part of the body, comprehended in it, for the preservation of it; and is either innate or born with us, or adventitious and acquisite. The radical or innate, is daily supplied by nourishment, which some call cambium, and make those secondary humours of ros and gluten to maintain it: or acquisite, to maintain these four first primary humours, coming and proceeding from the first concoction in the liver, by which means chylus is excluded. Some divide them into profitable and excrementitious. But [954]Crato out of Hippocrates will have all four to be juice, and not excrements, without which no living creature can be sustained: which four, though they be comprehended in the mass of blood, yet they have their several affections, by which they are distinguished from one another, and from those adventitious, peccant, or [955]diseased humours, as Melancthon calls them.
Blood.] Blood is a hot, sweet, temperate, red humour, prepared in the mesaraic veins, and made of the most temperate parts of the chylus in the liver, whose office is to nourish the whole body, to give it strength and colour, being dispersed by the veins through every part of it. And from it spirits are first begotten in the heart, which afterwards by the arteries are communicated to the other parts.
Pituita, or phlegm, is a cold and moist humour, begotten of the colder part of the chylus (or white juice coming out of the meat digested in the stomach,) in the liver; his office is to nourish and moisten the members of the body, which as the tongue are moved, that they be not over dry.
Choler, is hot and dry, bitter, begotten of the hotter parts of the chylus, and gathered to the gall: it helps the natural heat and senses, and serves to the expelling of excrements.
Melancholy.] Melancholy, cold and dry, thick, black, and sour, begotten of the more feculent part of nourishment, and purged from the spleen, is a bridle to the other two hot humours, blood and choler, preserving them in the blood, and nourishing the bones. These four humours have some analogy with the four elements, and to the four ages in man.
Serum, Sweat, Tears.] To these humours you may add serum, which is the matter of urine, and those excrementitious humours of the third concoction, sweat and tears.
Spirits.] Spirit is a most subtle vapour, which is expressed from the blood, and the instrument of the soul, to perform all his actions; a common tie or medium between the body and the soul, as some will have it; or as [956]Paracelsus, a fourth soul of itself. Melancthon holds the fountain of those spirits to be the heart, begotten there; and afterward conveyed to the brain, they take another nature to them. Of these spirits there be three kinds, according to the three principal parts, brain, heart, liver; natural, vital, animal. The natural are begotten in the liver, and thence dispersed through the veins, to perform those natural actions. The vital spirits are made in the heart of the natural, which by the arteries are transported to all the other parts: if the spirits cease, then life ceaseth, as in a syncope or swooning. The animal spirits formed of the vital, brought up to the brain, and diffused by the nerves, to the subordinate members, give sense and motion to them all.
SUBSECT. III.—Similar Parts.
Similar Parts] Containing parts, by reason of their more solid substance, are either homogeneal or heterogeneal, similar or dissimilar; so Aristotle divides them, lib. 1, cap. 1, de Hist. Animal.; Laurentius, cap. 20, lib. 1. Similar, or homogeneal, are such as, if they be divided, are still severed into parts of the same nature, as water into water. Of these some be spermatical, some fleshy or carnal. [957]Spermatical are such as are immediately begotten of the seed, which are bones, gristles, ligaments, membranes, nerves, arteries, veins, skins, fibres or strings, fat.
Bones.] The bones are dry and hard, begotten of the thickest of the seed, to strengthen and sustain other parts: some say there be 304, some 307, or 313 in man's body. They have no nerves in them, and are therefore without sense.
A gristle is a substance softer than bone, and harder than the rest, flexible, and serves to maintain the parts of motion.
Ligaments are they that tie the bones together, and other parts to the bones, with their subserving tendons: membranes' office is to cover the rest.
Nerves, or sinews, are membranes without, and full of marrow within; they proceed from the brain, and carry the animal spirits for sense and motion. Of these some be harder, some softer; the softer serve the senses, and there be seven pair of them. The first be the optic nerves, by which we see; the second move the eyes; the third pair serve for the tongue to taste; the fourth pair for the taste in the palate; the fifth belong to the ears; the sixth pair is most ample, and runs almost over all the bowels; the seventh pair moves the tongue. The harder sinews serve for the motion of the inner parts, proceeding from the marrow in the back, of whom there be thirty combinations, seven of the neck, twelve of the breast, &c.
Arteries.] Arteries are long and hollow, with a double skin to convey the vital spirit; to discern which the better, they say that Vesalius the anatomist was wont to cut up men alive. [958]They arise in the left side of the heart, and are principally two, from which the rest are derived, aorta and venosa: aorta is the root of all the other, which serve the whole body; the other goes to the lungs, to fetch air to refrigerate the heart.
Veins.] Veins are hollow and round, like pipes, arising from the liver, carrying blood and natural spirits; they feed all the parts. Of these there be two chief, Vena porta and Vena cava, from which the rest are corrivated. That Vena porta is a vein coming from the concave of the liver, and receiving those mesaraical veins, by whom he takes the chylus from the stomach and guts, and conveys it to the liver. The other derives blood from the liver to nourish all the other dispersed members. The branches of that Vena porta are the mesaraical and haemorrhoids. The branches of the cava are inward or outward. Inward, seminal or emulgent. Outward, in the head, arms, feet, &c., and have several names.
Fibrae, Fat, Flesh.] Fibrae are strings, white and solid, dispersed through the whole member, and right, oblique, transverse, all which have their several uses. Fat is a similar part, moist, without blood, composed of the most thick and unctuous matter of the blood. The [959]skin covers the rest, and hath cuticulum, or a little skin tinder it. Flesh is soft and ruddy, composed of the congealing of blood, &c.
SUBSECT. IV.—Dissimilar Parts.
Dissimilar parts are those which we call organical, or instrumental, and they be inward or outward. The chiefest outward parts are situate forward or backward:—forward,