Visual optics and sight testing / by Lionel Laurance.

  • Laurance, Lionel, 1856?-1936.
Date:
1912
Catalogue details

Licence: In copyright

Credit: Visual optics and sight testing / by Lionel Laurance. Source: Wellcome Collection.

Provider: This material has been provided by UCL Library Services. The original may be consulted at UCL (University College London)

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    3. Nerve-cell {ganglionic) layer. The retinal bloodvessels, which are the 1 tranches of the central artery and vein, lie in this layer. 4. Internal molecular layer. A fine network of fibres, which shut off the large bloodvessels from the posterior layers. 5. Internal granular layer. 6. External molecular layer. Similar to No. 4. It shuts off communication with the capillaries. 6a. The retinal plexus border layer. A narrow, well-defined layer of fibres discovered in the retinas of man and most monkeys, and so named by Lindsay Johnson. It is seen (frontispiece) in line with the front of the fovea, and extends only over and around the macular area. 7. External granular layer. C h. o to ' eL. V I T ft £ O US 1 Fig. 3.—Drawing made from a Microscopic Section of the Retina. 1, Membrana limitans interna ; 2, nerve-fibre layer ; 3, layer of ganglion cells ; 4, internal molecular layer; 5, internal nuclear layer; 6, external molecular layer; 7, external nuclear layer ; 8, membrana limitans externa; 9, bacillary layer (rods and cones) ; 10. hexagonal pigment layer. 8. External limiting membrane. A thin, perforated membrane supporting and insulating the rods and cones. 9. Bacillary layer, or layer of rods and cones. The receptive terminals of the optic nerve, on the ends of which the image of an external object is supposed to be formed. ](). Hexagonal pigment layer. A glandular layer secreting the visual purple, in which the outer parts of the rods and the tips of the cones are embedded. The layers of the choroid are— 11. Limiting membrane {membrane of Bruch). A transparent, colourless structureless layer. 12. Layer of capillaries. 13. Layer of large bloodvessels.