. A treatise on obstetrics for students and practitioners . Impregnated ovum, thirteen days old. (Schultze.) what is styled concrescence, gradually forming two layers or plateswhich unite in the axial line about the canal of the primitive trace ornotochord. The cells immediately surrounding the primitive trace areoften lighter in color and clearer than the other cells of the ovum. Assegmentation becomes complete, and the two layers of cells describedbegin to form, the ovum is sometimes styled the morula, becauseof its resemblance to a mulberry. The primitive trace or axis is wellstudied by tra
. A treatise on obstetrics for students and practitioners . Impregnated ovum, thirteen days old. (Schultze.) what is styled concrescence, gradually forming two layers or plateswhich unite in the axial line about the canal of the primitive trace ornotochord. The cells immediately surrounding the primitive trace areoften lighter in color and clearer than the other cells of the ovum. Assegmentation becomes complete, and the two layers of cells describedbegin to form, the ovum is sometimes styled the morula, becauseof its resemblance to a mulberry. The primitive trace or axis is wellstudied by transverse sections, which show layers of cells from whichdevelop the various portions of the body. These layers may be broadlygrouped in three, formerly known as epiblast, hypoblast, aud meso-blast, and termed by later writers ectoderm, endoderm, and classifying the various organs of the body which develop fromthese layers the basis of classification must be the essential element inthe organ in question. Upon this basis the following classificat
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectobstetrics, bookyear1
