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. 2012 Feb;139(2):159–187. doi: 10.1085/jgp.201110692

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© 2012 Hárosi and Novales Flamarique

This article is distributed under the terms of an Attribution–Noncommercial–Share Alike–No Mirror Sites license for the first six months after the publication date (see http://www.rupress.org/terms). After six months it is available under a Creative Commons License (Attribution–Noncommercial–Share Alike 3.0 Unported license, as described at http://creativecommons.org/licenses/by-nc-sa/3.0/).

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Figure 2. — Drawings of single cones from fresh retinal preparations illustrating the morphological parameters measured as well as the taper angle, τ. The cellular dimensions were obtained from video images recorded via a microscope equipped with a calibrated infrared-sensitive video system. (A) Single cone from blue gill sunfish. (B) Single cone from leopard frog. (C) Cone outer segment (left) from B and an idealized representation of that of the optically equivalent rod (right). The equivalency is based on the assumption that both cells have equal entrance aperture with diameter d_i and that the cone ellipsoid funnels the incident flux to the outer segment without loss. The cellular dimensions (in µm) for these cones were as follows: (A) for the blue gill sunfish, d_i = 8.3, d_o = 5.0, d_z = 2.9, z = 18, and the inner segment length, l_i = 25.2; (B) for the leopard frog, d_i = 7.2, d_o = 2.8, d_z = 1.3, z = 6.3, and l_i = 17.5. The parameter z, in these two cases, equals the outer segment length, and d_z is the diameter at the tip of the outer segment. The asterisk in B depicts an oil droplet.