Manual of human histology . are composed of two por- (, \tions, a deeper, belonging to the mucous imembrane and an epithelial, superficialcoat. The contour of the former orvillus proper, is similar to that of the !entire villus; it is simply a solid ^. dprocess of the mucous membrane, con- ^r taining blood-vessels. Fig. 208. lymphatics and smoothmuscles, whose matrix,through which a varia-ble number of roundishnuclei are scattered, ingeneral exhibits nomorphological charac-ter more decided thanthat of the mucousmembrane itself, yetmust most undoubtedly be regarded as a metamorphosedconnective
Manual of human histology . are composed of two por- (, \tions, a deeper, belonging to the mucous imembrane and an epithelial, superficialcoat. The contour of the former orvillus proper, is similar to that of the !entire villus; it is simply a solid ^. dprocess of the mucous membrane, con- ^r taining blood-vessels. Fig. 208. lymphatics and smoothmuscles, whose matrix,through which a varia-ble number of roundishnuclei are scattered, ingeneral exhibits nomorphological charac-ter more decided thanthat of the mucousmembrane itself, yetmust most undoubtedly be regarded as a metamorphosedconnective tissue, without any intermixture of elastic blood-vessels of the villi (fig. 208) are so numerous. Fig. 207. Intestinal villus of a young Kitten without its epithelium, to whichacetic acid has heen added : a, boundary of the villus; h, subjacent nuclei; c, nucleiof the smooth muscles; d, round nuclei in the centre of the villus. Fig. 208. Vessels of a few villi of the Mouse, after one of Gerlachs injections,X 94 SPECIAL HISTOLOGY. that when well injected, those whose epithelium has beendetached become coloured throughout; and, in livinganimals, or those which have just been killed, each villus, ifviewed from above, appears as a red dot surrounded by a clearring. In man, every villus contains a close network ofcapillaries of 0003—0-005, with roimded or elongated nuclei^which lies immediately beneath the homogeneous externallayer of the matrix, and is supplied by 1, 2, or 3 small arteriesof OOl—0016. The blood is usually carried back directlyinto the larger trunks of the submucous tissue, by a vein of0022, which does not arise, as in animals, by the archinground of the artery, but proceeds from the gradual confluenceof the finest capillaries. The relations of the lacteals in the villi of man, have nothitherto been perfectly made out; for although the majority of„. investigators are inclined, like the older observers, to suppose that they com-mence by one or
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Keywords: ., bookcentury1800, bookdecade1850, booksubjecthistolo, bookyear1853
