Text-book of ophthalmology . es the cutis and, like the latter, contains,besides hair follicles, sebaceous glands and often alsosweat glands. On the other hand, acinous glandsalso occur such as are present in mucous membranes(like Krauses glands of the conjunctiva). In rarecases dermoids contain hyaline cartilage or bone (thelatter cases being described as osteomata), so thatcomplicated structures develop which may be calledteratomata. Remak supposed that dermoids, like dermoidcysts, originated in a fetal invagination of the outergerm-layer. On the other hand, Van Duyse believedthat they owe t
Text-book of ophthalmology . es the cutis and, like the latter, contains,besides hair follicles, sebaceous glands and often alsosweat glands. On the other hand, acinous glandsalso occur such as are present in mucous membranes(like Krauses glands of the conjunctiva). In rarecases dermoids contain hyaline cartilage or bone (thelatter cases being described as osteomata), so thatcomplicated structures develop which may be calledteratomata. Remak supposed that dermoids, like dermoidcysts, originated in a fetal invagination of the outergerm-layer. On the other hand, Van Duyse believedthat they owe their origin to a circumscribed ad-hesion between the amnion and the surface of theeyeball, which before the fourth month is not cov-ered by the lids. The adhesion between the amnionand the eyeball afterward is drawn out into a cordand finally breaks in two, its point of attachmentto the eye remaining behind as a dermoid this hypothesis does not explain why this pointof attachment shows the structure of the external. Fig. 64.—Dermoid Tumor of theCornea and SubconjunctivalLipoma in a Thirteen-year-oldGirl. The hairy dermoid tumor is situatedon the outer and lower margin of thecornea, lying to a small extent in thecornea, and more largely in the eye has to be turned stronglyinward in order to bring the lipomawell into view. The lipoma has aform diffeiing from the ordinary inthat it consists of two lobules, one,more bulging, lying beneath the lowerlid, the other, natter and lying underthe upper lid. In addition it sendsout a process which runs in the hori-zontal meridian of the eyeball as faras the outer margin of the cornea. Itis everywhere covered by compactconjunctiva which resembles skin, butwhich nevertheless allows the yellowcolor of the underlying fat to showthrough. skin with glands, since the amniotic bands are sim-ple connective tissue. It is henoe more probable that the amnion contributes to thedevelopment of dermoids only to this extent, that when
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Keywords: ., bookcentury1900, bookdecade1910, booksubjecteye, booksubjectophth
