The development of the human body; a manual of human embryology . des themass into an inner and an outer portion. The cavity isthe anterior chamber of the eye, and it has served to sepa-rate the cornea (co) from the tunica vasculosa lentis (tv),and, extending laterally in all directions, it also separatesfrom the cornea the mesenchyme which rests upon themarginal portion of the optic cup and constitutes thestroma of the iris. Cells arrange themselves on the cor-neal surface of the cavity to form a continuous endotheliallayer, and the mesenchyme which forms the peripheralboundary of the cavity
The development of the human body; a manual of human embryology . des themass into an inner and an outer portion. The cavity isthe anterior chamber of the eye, and it has served to sepa-rate the cornea (co) from the tunica vasculosa lentis (tv),and, extending laterally in all directions, it also separatesfrom the cornea the mesenchyme which rests upon themarginal portion of the optic cup and constitutes thestroma of the iris. Cells arrange themselves on the cor-neal surface of the cavity to form a continuous endotheliallayer, and the mesenchyme which forms the peripheralboundary of the cavity assumes a fibrous character andforms the ligamentum pectinatum iridis, among the fibers 496 THE DEVELOPMENT OF THE HUMAN BODY. of which cavities, known as the spaces of Fontana (, sf ), appear. Beyond the margins of the cavity thecorneal tissue is directly continuous with the sclerotic,beneath the margin of which is a distinctly thickenedportion of mesenchyme resting upon the ciliary processesand forming the stroma of the ciliary body, as well as etc ec-. Fig. 264.—Transverse Section through the Ciliary Region of a Pig Embryo of 23 , Anterior chamber of the eye; co, cornea; ec, ectoderm; /, lens; mc, ciliary muscle; p, pigment layer of the optic cup; r, retinal layer; tv, tunica vasculosa lentis.—(Angelucci.) giving rise to the muscle tissue which constitutes theciliary muscle (Figs. 263 and 264, vie). The ectoderm which covers the outer surface of the eyedoes not proceed beyond the stage when it consists ofseveral layers of cells, and never develops a stratum cor-neum. In the corneal region it rests directly upon thecorneal tissue, which is thickened slightly upon its outer THE EYELIDS. 497 surface to form the membrane of Bowman; more periph-erally, however, a quantity of loose mesodermal tissuelies between it and the outer surface of the sclerotic, and,together with the ectoderm, forms the conjunctiva (, cj). The Development of the Accessory Apparatus o
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectembryol, bookyear1902
