Abstract
Landolt's club process has been detailed in the adult Japanese quail retina. In Golgiimpregnated specimens, the process has been shown to arise either as a direct continuation of the dendritic trunk of some cells of bipolar nature or from a branch of their dendritic tuft. It courses through the outer plexiform layer to end at the level of the external limiting membrane (ELM) in a terminal expansion. In several cases, a thin cilium-like structure arises from the expansion and extends toward the pigment epithelium. Additionally the electron microscope reveals the following associations: club-club, club-photoreceptor cell and club-Müller cell. Electron-dense thickenings in the region of the cell boundaries were observed in club-photoreceptor cell associations, but no synaptic vesicles were found. Ultrastructurally, the terminal expansion narrows to a slender neckpiece which in turn expands into a bulbous swelling external to the ELM. A cilium is found in the terminal expansion (9+0 arrangement of microtubules) and its companion centriole is present in the bulbous swelling.
Published Version
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