. Text-book of normal histology: including an account of the development of the tissues and of the organs. Blastodermic layers of rabbit embrj-o: a, ectoderm; 3, entoderm; f, entodermal cells destined tofijrm notochord ; m, mesoderm. form epithelial structures in contrast to the less compact and morereticular formations of the mesoderm. The epithelia of the genito-urinary tract, however, are marked exceptions in their origin, beingderived, as well as the connective and muscular tissues, from themesoderm, in this respect constituting conspicuous specializations. THE CELL AND THE TISSUES. 25 Der
. Text-book of normal histology: including an account of the development of the tissues and of the organs. Blastodermic layers of rabbit embrj-o: a, ectoderm; 3, entoderm; f, entodermal cells destined tofijrm notochord ; m, mesoderm. form epithelial structures in contrast to the less compact and morereticular formations of the mesoderm. The epithelia of the genito-urinary tract, however, are marked exceptions in their origin, beingderived, as well as the connective and muscular tissues, from themesoderm, in this respect constituting conspicuous specializations. THE CELL AND THE TISSUES. 25 Derivatives of the Primary Blastodermic Layers. From the ectoderm are derived— The epitheHum of the outer surface of the body, including thatof the conjunctiva and anterior surface of the cornea, theexternal auditory canal, together with the epithelial append-ages of the skin, as hair, nails, sebaceous and sweat glands(including the involuntary muscle of the latter).■ The epithelium of the nasal tract, with its glands, as well as ofthe cavities communicating therewith. The epithelium of the mouth and
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Keywords: ., bookcentury1800, bookdecade1890, bookpublisherphiladelphiajblipp
