A system of obstetrics . / /. A B Diagram. Cross-sections of Optic stalk: .1, before its epiblastic layers have come in contact; Btafter they have met, and the mesoblast, shut in by their infolding, lias given origin to thecentral artery and other blood-vessels and the connective tissues surrounding them; <p,epiblast of outer layer of optic stalk; ep, epiblast of infolded layer; me, mesoblast; v,developing blood-vessels of optic nerve; ov, remnant of primitive cavity of the optic stalk. extends into its cavity and forms the central artery of the retina andother vessels, and their enveloping
A system of obstetrics . / /. A B Diagram. Cross-sections of Optic stalk: .1, before its epiblastic layers have come in contact; Btafter they have met, and the mesoblast, shut in by their infolding, lias given origin to thecentral artery and other blood-vessels and the connective tissues surrounding them; <p,epiblast of outer layer of optic stalk; ep, epiblast of infolded layer; me, mesoblast; v,developing blood-vessels of optic nerve; ov, remnant of primitive cavity of the optic stalk. extends into its cavity and forms the central artery of the retina andother vessels, and their enveloping connective tissue. The sides of the 166 DEVELOPMENT OF THE EMBRYO. stalk soon unite below (Fig. 100, B). As development proceeds, theoptic stalk shifts back, so as to become attached to the optic primitive cells form the neuroglia of the permanent optic nerves,the true optic nerve-fibres being a secondary development. Whetherthey arise from cells of the optic vesicle or as branches of cells in themid-brain is not
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectobstetrics, bookyear1
