. Un livre de texte de physiologie humaine . er (F) dans une arborisation terminale qui vient en relation avec les branchlets extérieurement dirigés de cellules de ganglion définies. ON donne DES IMAGES SUR LE RETIXA 515 des cellules des fibres optiques de la couche de ganglion, formant la couche la plus interne de la rétine, la couche de fibres nerveuses {H). L'étendue latérale du tuft extérieur des dendrites des cellules bipolaires (£),toutes deux celles qui correspondent aux tiges et celles qui correspondent aux thécones, varie beaucoup. En général, plusieurs tiges ou cônes sont reliés à l'eachof des cellules bipolaires. Mais chaque cône du fov

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. A text-book of human physiology . er (F) in a terminal arborization which comes into relationwith the outwardly directed branchlets of definite ganglion cells. IMAGES UPON THE RETIXA 515 From the cells of the ganglion layer optic fibers are given off, forming theinnermost layer of the retina, the nerve-fiber layer {H). The lateral extent of the outer tuft of dendrites of the bipolar cells (£), both of those which correspond to the rods and those -which correspond to thecones, varies greatly. In general several rods or cones are connected with eachof the bipolar cells. But each cone of the fovea centralis is in contact withthe dendrites of but one bipolar cell. Compared with the end arborizations of the ganglion cells those of thebipolar cells are very small; consequently the smallest ganglion cells must bein touch with a relatively large number of bipolar cells. In addition to these elements the retina contains still other cells of a nerv-ous nature, lying either in the inner granular layer (outer and inner horizontal. Fig. 211.—A section through the retina of a full-grown dog, after Cajal. A, layer of rods andcones; B, outer granular layer, containing tlie bodies of the visual cells; C, outer plexiformlayer; E, inner granular layer, containing the bipolar cells; F, inner plexiform layer; G, gan-glion cell layer; H, layer of the optic fibers. a, cone fiber; b, bodj and fiber of a rod cell;c, bipolar cell with brush of fibrils belonging to the cones; /, giant bipolar cell with widespreading brush of fibrils; /(, diffuse amacrine cell, the varicose processes of which lie for themost part directly on the ganglion cells; i, ascending nerve fibers; ;, centrifugal fiVjers; 7 and</, specialized cells which arc seldom imjiregnated; v. ganglion cell receiving within it the ter-minal brush of a bipolar cell from the rods; m, nerve fiber which is lost in the inner ple-xifonnlaver. cells) or in the inner plexiform layer (amacrine cells, /()• The former, accord-ing to C

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