A Reference handbook of the medical sciences embracing the entire range of scientific and practical medicine and allied science . Fio. 4835.—Human Amniotic Villus. Ep, epitrichium; , stratum comeum;.s-!/. yiratiiiii granulosum ; S,(?., stratum^rHnninaiivLiiii; ^ basement mem-brane uf very dense fibrous tissue: ,Dbrous tissue; , areolar tissue. X380 diameters. an outer circular layer containingfibres and delicate elastic muscle cells arc separated by an unusual amount of coimective tissue,simulating p ro to-pi a s m i c is no adven-titia. The vein hasan
A Reference handbook of the medical sciences embracing the entire range of scientific and practical medicine and allied science . Fio. 4835.—Human Amniotic Villus. Ep, epitrichium; , stratum comeum;.s-!/. yiratiiiii granulosum ; S,(?., stratum^rHnninaiivLiiii; ^ basement mem-brane uf very dense fibrous tissue: ,Dbrous tissue; , areolar tissue. X380 diameters. an outer circular layer containingfibres and delicate elastic muscle cells arc separated by an unusual amount of coimective tissue,simulating p ro to-pi a s m i c is no adven-titia. The vein hasan endothelium anda muscle lay e r ,chiefly of circidarfibres, but longitudi-nal biindles appearinegularlj in thislayer or on eitherside of it. Elasticplates are more high-ly developed than intiie arteries. No vasavasoium or in the umbilicalvessels. Hemorrhagewhen the cord is .severed is prevented by the contrac-tion of the arteries, rendered possible by their lack ofelastic tissue and abun-dance of muscle. Thevein remains open, butthe lumen of the arteryis ncai-ly or quite oblit- <^^?tX^!~-. Fig. 4836.—Cross Section of an fmbilicalCord at Term. 1, Remnant of the al-lantois; V, umbilical vein; A, A, um-bilical arteries. X about 13 diameters. Fig. 4834.— Amniotic Villus, from a Normal Human Amnion at Term. X 55 diameters. the vitreous humor were quite similar, and the statementhas been repeatedly copied. Since the vitreous humorhas been found to be of ectodermal origin, it has recentlybeen removed from this group. Whartons jelly is still crated (Fig, 4836). The stimulus causing the contrac-tion is the tearing, of the cord, which in cows accom-panies the expulsion of the. fatus, in carnivora is ac-complished by biting and in swine partly by trampling. REPEREXCE HANDBOOK OF THE MEDICAL SCIENCES. Uniblliral Hennebergs experiments eliminated f)tlier hypotheticalfactors, such as the clotting of the blood and the effect ofthe increased pulmonary cir
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