English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

Early electron microscope studies of the ciliary epithelium of the rabbit eye reported large numbers of vesicles at the free surface of the non-pigmented cell layer (4, 7). Characteristically, these vesicles were arranged in long rows, and it was suggested that they were engaged in pinocytosis. More recently, the present author reported a different interpretation of these rows of vesicles (12). This interpretation, like those of previous workers, was based on observations of OsOrf ixed material. I t is summarized in Fig. 1 A. The apparent rows of vesicles are seen to be actually sheets of tubules cut in cross-section. Because these tubules are extensively interconnected, they were identified as an unusual "sheeted" form of smoothsurfaced endoplasmic reticulum. The original paper (12) should be consulted for details of this interpretation. Another prominent feature of the free surface of the ciliary epithelium is extensive interdigitations or "infoldings" of the plasma membrane. The basic geometry of these structures is illustrated in Fig. 1 B, and, again, the original paper (12) should be consulted for details. A comparison of Figs. 1 A and B reveals that the over-all configurations of both the sheets of tubules and the interdigitations are essentially identical, i.e., both structures are in the form of two parallel sheets joined together into a U-loop. It is also noteworthy that the tubules, as seen in cross-section, have a variable length but a fairly constant width which is approximately the same as the width of the intercellular space separating the paired plasma membranes of the interdigitations. Also of significance is the fact that both types of structure are limited to the same part of the cell, and usually are closely associated with one another. This similarity between the two structures raises

DIFFERENCES IN MEMBRANE CONFIGURATION BETWEEN OSMIUM TETROXIDE-FIXED AND GLUTARALDEHYDE-FIXED CILIARY EPITHELIUM