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English: Fig. 41.—Retina and Optic Nerve of Petromyzon. (After Müller and Langerhans.)


On the left side the Müllerian fibres and pigment-epithelium are represented alone. The retina is divided into an epithelial part, C (the layer of visual rod-cells), and a neurodermal or cerebral part which is formed of, A, the ganglion of the optic nerve and, B, the ganglion of the retina. 1, int. limiting membrane; 2, int. molecular layer with its two layers of cells; 3, layer of optic nerve fibres; 4, int. nuclear layer; 5, double row of tangential fulcrum cells; 6, layer of terminal retinal fibres; 7, ext. nuclear layer; 8, ext. limiting membrane; 9, layer of rods; 10, layer of pigment-epithelium. D, axial cell layer (Axenstrang) in optic nerve. The layer 6 is drawn rather too thick.


(All references in this work to Ammocœtes or Petromyzon appear to refer to the species now called Lampetra planeri.)
Date
Source The Origin of Vertebrates. https://archive.org/details/originofvertebra1908gask
Author Walter Holbrook Gaskell.


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current23:58, 9 November 2013Thumbnail for version as of 23:58, 9 November 20131,700 × 1,246 (280 KB)Keith Edkins== {{int:filedesc}} == {{Information |Description={{En|Fig. 43.—Diagram of the Relation of the Optic Nerve to the Optic Cup. }} |date=1908 |Source=The Origin of Vertebrates. https://archive.org/details/originofvertebra1908gask |Author=Walter Holbrook...

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