Electron microscopy; proceedings of the Electron microscopy; proceedings of the Stockholm Conference, September, 1956 electronmicrosco00euro Year: 1957 The Structure of the Retinal Receptors of the Toad Eye 195 Fig. 2. Longitudinal section of a proximal cell outer segment in a double cone. The double membrane disks are well demonstrated. Magnification 58,000. In the double cones we may distinguish between one outer segment with a more proximal location than the other. The proximal outer segment is larger than the distal one and reminds of a rod outer seg- ment. It is, however, lacking the
Electron microscopy; proceedings of the Electron microscopy; proceedings of the Stockholm Conference, September, 1956 electronmicrosco00euro Year: 1957 The Structure of the Retinal Receptors of the Toad Eye 195 Fig. 2. Longitudinal section of a proximal cell outer segment in a double cone. The double membrane disks are well demonstrated. Magnification 58,000. In the double cones we may distinguish between one outer segment with a more proximal location than the other. The proximal outer segment is larger than the distal one and reminds of a rod outer seg- ment. It is, however, lacking the incisions character- istic for the rod outer segment. The distal outer seg- ment resembles that of the single cones. In the single cones the dimensions of the double membrane disks are: total thickness 230 A, base diameter 2-3 //. The osmiophilic layers are 70 A thick and the interposed, less osmiophilic layer 95 A thick. The average spacing is 490 A. In the proximal cell of the double cones the dimen- sions of the double membrane disks are: total thick- ness 130 A, base diameter about 2 //. The average spacing is 220 A (fig. 2). In the /////('/• segments of the single cones a strongly osmiophilic oil droplet may occur. It is almost completely surrounded by mitochondria. In some of the mitochondria located in contact with the oil droplet a system of 8-10 concentrically oriented and very densely packed double membranes may be observed. The proximal component of the double cones contains distally in its inner segment an ellipsoid consisting of mitochondria. Proximally to the ellip- soid the well delimited paraboloid is observed. It consists of a homogeneous ground substance in which vacuoles and vesicles are present (fig. 3). The cytoplasm of the distal component proximal to the ellipsoid contains irregularly outlined vacuoles of varying sizes. No paraboloid is present. The inner segments of the two components of the double cones are in close contact with the osmiophilic layer
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