. A Reference handbook of the medical sciences : embracing the entire range of scientific and practical medicine and allied science. ction oranother, thus giv-ing rise to the ap-pearance of alter-nating spiral coats,noticed by LawsonTait (p. 434, andPlate xiii., and 18). Themuscular coat pass-es over without anysharp demarcationinto the surround-ing tissue, knownas Whartons jelly,which consists ofscattered anasto-mosing cells (com-pare Fig. 4247),and a muciparousmatrix with verynumerous connective-tissue fibres. The cells and fibrestend to arrange themselves in concentric lines around
. A Reference handbook of the medical sciences : embracing the entire range of scientific and practical medicine and allied science. ction oranother, thus giv-ing rise to the ap-pearance of alter-nating spiral coats,noticed by LawsonTait (p. 434, andPlate xiii., and 18). Themuscular coat pass-es over without anysharp demarcationinto the surround-ing tissue, knownas Whartons jelly,which consists ofscattered anasto-mosing cells (com-pare Fig. 4247),and a muciparousmatrix with verynumerous connective-tissue fibres. The cells and fibrestend to arrange themselves in concentric lines around theblood-vessels and parallel to the surface of the cord (), so that we may speak of four systems ; within eachsystem the cells tend to an elongated form, but where thesystems approach one another the cells become more tri-angular (as seen in sections, Fig. 4247), and show threeor four main processes. These triangular cells form, of * Wandering cells occur in the intercellular spaces of Whartons jelly,and it is possible that there are in the matrix, thoughno vessels. Compare particularly Kosters Pm Fig. 4244.—Diagram of a Cross Section of theHauchstiel of a Human Embryo, md. Me- ?dullary groove ; Am, amnion ; V, umbilicalvein; coe, ccelom ; A, umbilical artery ; All,allantois. 388 REFERENCE HANDBOOK OF THE MEDICAL SCIENCES. Cord. course, long columns, which are more or less distinct fromthe tissue encompassing the vessels ; to these columns thename of chorda funiculm has been applied by Hyrtl ;they are said to have been noticed by Woortwyck over acentury ago. The external covering of the cord is astratified epithelium, of which the outer layer is distinctlycorneous ; sometimes there are spaces without cells,
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectmedicine, bookyear188
