Treasury of human inheritance . of the eye there is no return outgrowth,for the connection of the lens pit with its mother surface cells is cut ofl: by therapid growth of the surrounding mesoblast. In this way an island-like globe isburied to continue an isolated development. Within the limits of this sphere ofcells the solid lens is produced. The cells of the deeper layer grow and continue to grow so as to fill thecavity of the buried sphere. The cells elongate, become fibrous, assume a clear,transparent character, and spread over each other in neatly arranged layers. Eachfibre takes a defini
Treasury of human inheritance . of the eye there is no return outgrowth,for the connection of the lens pit with its mother surface cells is cut ofl: by therapid growth of the surrounding mesoblast. In this way an island-like globe isburied to continue an isolated development. Within the limits of this sphere ofcells the solid lens is produced. The cells of the deeper layer grow and continue to grow so as to fill thecavity of the buried sphere. The cells elongate, become fibrous, assume a clear,transparent character, and spread over each other in neatly arranged layers. Eachfibre takes a definite and almost mathematically accurate course, so that in the end a lens of clear, elastic and higlily-refracting material is produced. The fibres arecemented together by a fine glue, and the whole lens is enveloped by a clear elasticcapsule ; both the glue and the capsule are the secretions of the lens fibres them-selves. The figures below give a good idea of the arrangement of the lens fibres. gP r$^- M- ^SHilMsiSMi^ *«« i^.
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Keywords: ., bookaut, bookauthorharmannbishop, bookcentury1900, bookdecade1900
