The pathology and surgical treatment of tumors . es-tigations which have been made regarding the origin of similar tumorsin other organs. Epithelial cells cannot produce bone; and teeth only Fig. 466.—Dermoid of the auricle and nevus ofthe palpebral conjunctiva (after Lannelongue). 644 PATHOLOGY AND TREATMENT OF TUMORS. grow from a matrix of cells producing their essential histological parts,dentine, enamel, and cementum. Dermoids of the ovary arise, as do dermoids of any other part ororgan, from matrices derived from an erratic development in the em-bryo. In the embryo the ovaries develop fro
The pathology and surgical treatment of tumors . es-tigations which have been made regarding the origin of similar tumorsin other organs. Epithelial cells cannot produce bone; and teeth only Fig. 466.—Dermoid of the auricle and nevus ofthe palpebral conjunctiva (after Lannelongue). 644 PATHOLOGY AND TREATMENT OF TUMORS. grow from a matrix of cells producing their essential histological parts,dentine, enamel, and cementum. Dermoids of the ovary arise, as do dermoids of any other part ororgan, from matrices derived from an erratic development in the em-bryo. In the embryo the ovaries develop from the genital ridge, whichat an early date is intimately associated with the cells lining the peri-toneum and connected with the peritoneal funnels. The origin of theWolffian duct is intimately connected with the epiblast; consequentlythe ovaries are the seat of the most complicated histological processesduring their development, and must necessarily frequently become theseat of rests which, when excited to active tissue-proHferation, furnish. Fig. 467.—Dermoid cyst of the ovary (after Wyder). Tlie cyst-wall was filled by a fatty mass enclosingreddish hairs. The structure of the wall is seen to be like that of the skin. The upper stratum in the illus-tration (the inner layer of the cyst) is formed of closely-packed cells, flattened toward the surface by mutualpressure. Beneath are two layers of fibrous tissue separated by loose adipose tissue. The fibrous stromaof the latter is formed by fibrillae from the two connective layers. An Important detail of this specimen isthe presence of sweat-glands by the side of sebaceous glands and hair-follicles. the material for the different kinds of dermoids. We observe here thesimplest kinds of dermoid cysts, containing nothing but atheromatousmaterial, as well as the most complicated forms, in which there arefound not only hair and teeth, but also brain-tissue, mucous mem-brane, and incomplete skeletons. So many fetal parts are sometim
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectneoplas, bookyear1895
