Manuale di istologia umana . hen ha detto che esse sono seatedupon i rami del hepaticvein, come le foglie sulla loro levetta.Infatti troviamo, se un smallbranch della vena epatica essere slitup, (fig. 218, b b b) che è circondato su tutti i lati da thehepatic lobuli e riceve una singola vena da ciascuno in modo che theyactually sembrano essere collegati ad essa da brevi peduncoli. Nowsince questo avviene esattamente nello stesso modo da theveins di moderate dimensioni fino a intra-vene lobulare, thehepatic vene e dei lobuli possono, non senza ragione, essere comparedto un albero i cui rami sono così numerosi e s

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Manual of human histology . hen he said, that they are seatedupon the branches of the hepaticvein, like leaves upon their stalk.In fact we find, if a smallbranch of the hepatic vein be slitup, (fig. 218, b b b) that it is surrounded on all sides by thehepatic lobules and receives a single vein from each, so that theyactually appear to be attached to it by short pedicles. Nowsince this takes place in exactly the same manner from theveins of moderate size up to the intra-lobular veins, thehepatic veins and lobules may, not without reason, be comparedto a tree whose branches are so numerous and so closely besetwith polygonal leaves that the foliation, so to speak, consti-tutes one mass. Imagine now, that another ramified system. Fig. 218. Segment of a Pigs liver, with an hepatic vein laid open, somewhatmagnified: a, large vein, into which as yet no intralobular veins open ; b, its branches, with intralobular veins, and the bases of the lobes shining through. After Kiernan. II. 8 f?^y 114 SPECIAL HISTOLOGY. Fig. 219.. composed of vessels^ is introduced into the expanded head ofthis tree, in such a manner that the larger vessels lie in the clefts between its principal masses, the smaller and smallest, inthose between the subordi-nate masses, ultimately pene-trating into the lobules them-selves, so that every lobuleis connected with many ofthe finest twigs, receiving acoat from the connective tis-sue which accompanies them, and we shall have as distinctan idea as possible of therelations of the vena portcs.The hepatic duct and arterymerely accompany the venaport(B and, therefore, requireno special notice.In foim, the lobes of the Pig^s liver are angular, usuallypresenting irregular four, five and six-sided figures in longi-tudinal and transverse sections. In the human liver, but very little connective tissue accom-panies the vena portos between the hepatic islets, and the lattercan neither be said to possess coats nor to be in any completemanner enclosed by the vessels. In c

Parole chiave associate all'immagine

• bookcentury1800
• bookdecade1850
• booksubjecthistolo
• bookyear1853