OCR Text |
Show i94 Off/ye particular Distribution qft/Je Absorbent Vcsscls eial and deep-seated. in the (It'fcrcnt I'm-ts of HM Bady. The superficial set, like those of the other visa ccra, are not always to be found. I have been able, at one time, to shew absorbents I had the whole external surface of the lungs covered with the find one. The same thing injected; at another time I have not been able to said. One I have known happen frequently in the liver, as I have already of a still-born of the easiest methods of finding them is to inflate the lungs the air-cells, and fillchild from the trachea; the air passes instantly from al absorbing all the absorbents, enables us to see particularly the superfici one of those absorbents; if a puncture is then made with a lancct into any in its place, cuts, the air will escape, and quicksilver may then be injected difficult to is this : air-cells the into escaping from it hinder as the valves the most conceive, but I have notwithstanding always found it so. One of was in this perfect preparations I ever made of the absorbents of the lungs, unfair way. Perhaps infectious particles may enter as readily: it would be from an experiment of this kind, made in a dead body, to infer any thing respecting the living; for if transudation takes place in dead bodies, and not in living, this phacnomenon may be one of those connected also with a loss of living principle in the lungs. VVinslow‘s observation, respectsuring the appearance of the cellular membrane forming areolze, which d, and which round the smaller lobes of which the lungs are compose e lymphatic vescommunicatc with one another, and when inflated resembl sufficiently scls, is also perfectly just: if a puncture is made with alancet, not , the appear- deep, between the areolae, and air is thrown in at that puncture alittle ance he describes is constantly produced; but if the lancet is pushed deeper, an opening will commonly be made into an absorbent, and if air is thrown into that opening, an appearance not unlike the former will be pro- absorbents. duced, but which, notwithstanding, is the real appearance of the \Vhen mercury is thrown into these vessels, it discovers at first a coarser ata reti- net-work in the interstices of the smaller lobes, " vasa concaten ‘95 the absorbents here have no valves: this assertion is not true Th remark has been made with regard to the smaller absorbents oh the sc Sfmc of the liver, but is equally ill founded; the anastomoses between the braunrclice is so great, that the momcntthe quicksilver enters one of the lar cr vessdlc‘s it is seen running in every direction: but this is not owing to tlgic want I valves, but to the circumstance I have already mentioned' besides f1) valves in the smaller branches do not so accurately shut the cavities ol :1 C vessels, in the dead body, as in the larger branches. The superficial alic sorbents terminate at last in glands at the root of the lungs where the a - Jlomed by the deeper-seated absorbents. These last ramify tfirouah the ly n: in the same manner as the pulmonary artery and veins and clih to fhciif coats; but are found in greater numbers on the outer suiface of thegbrancl e of the trachea. "These I have constantly injected from the superficial 3le sorbents; indeG' A 't is hardly possible, either here or in the liver to in'eci the superficial absorbents, and not to inject, at the same time 'the ddc seated ones. From the glands at the root of the lungs, trunks dorres mug- ing to both sets, arise. In the left lobe of the lungs0 several 'trunks [unite- and form a very large one, which I have sometimes seen equal to an ordi: nary goose-quill in diameter; this is inserted into the thoracic duct imme diately behind the bifurcation of the trachea. Another trunk runs u on the posterior part of the trachea, between it and the (esophavus and teii‘mi nates in the thoracic duct near its insertion. A third truiik,joins those glands in which the absorbents of the heart terminate, and is inserted at last as they are. The absorbents of the right lobe of the luncs also form three and sometimes four trunks, as they emerge from the glacnds placed at the root of the lungs; one of these trunks runs upwards over the anterior sur. face of the cava superior, and, having formed in its course numberless and most elegant convolutions, terminates at last in the second trunk of the ab- sorbent in the right side ; another, after forming similar convolutions passes culum facicntia," as I'Iallcr expresses it; but if a ligature is made on the also into the thoracic duct, behind the bifurcation of the trachea; :1 third n is pushed trunks of the absorbents at the root of the lungs, and the injectio without forming any eonvolutions, passes with the trunk of the vcna azygos: and is inserted into the duct near the origin of that vein. Ihave sometimes seen a fourth trunk, which ran downwards, and was not inserted into the. thoracic duct till it reached the diaphragm. Some of the absorbents of the to the utmost, another net-work is discovered within the former, immensely delicate and fine; and the whole surface of the lungs may, in this way, be shewn to be covered with absorbents. It has been said by some, that the C c 2 right |