The histological data presented in this paper characterize the early stages of development (5.5–20 weeks) of the extreme
visual retinal periphery in human (pars optica retinae) near ora serrata where retina undergoes transformsation into
blind tunic under ciliar body (pars caeca retinae) lacking photosensitivity. This area attracted attention of
investigators due to a cone-enriched rim (CER) whose origin and functions had been most often discussed in
psychophysical but not morphological literature. The analysis of our data and the data published by other investigators
allows suggestion that different hypotheses about the role of CER could have relation to different zones of the extreme
periphery. The “morphological” hypothesis implying that CER cells could migrate from the peripheral to the central area
and could serve as a source of material for the rest of the retina might be related to the area of the extreme periphery
occupying more anterior position than CER and containing immature not differentiated cells. As for the “psychophysical”
hypotheses on the participation of CER in the mechanisms of color constancy and locomotion control, these hypotheses
might only be related to the more posterior part of the extreme periphery containing mature cells and similar in
structure to the main part of the retina.
Key words:
human eye, prenatal development, ora serrata, extreme retinal periphery, cone-enriched rim
DOI: 10.1134/S0235009218040091
Cite:
Panova I. G., Poltavtseva R. A., Rozhkova G. I.
Morfologicheskaya kharakteristika razvitiya krainei periferii setchatki v oblasti ora serrata
[Characteristics of morphological development of the extreme retinal periphery near ora serrata].
Sensornye sistemy [Sensory systems].
2018.
V. 32(4).
P. 302-309 (in Russian). doi: 10.1134/S0235009218040091
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