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Development of the primate area of high acuity, 3: Temporal relationships between pit formation, retinal elongation and cone packing

Published online by Cambridge University Press:  02 June 2005

A.D. SPRINGER  and
A.E. HENDRICKSON
A.D. SPRINGER
Affiliation:
Department of Cell Biology and Anatomy, New York Medical College, Valhalla
A.E. HENDRICKSON
Affiliation:
Biological Structure and Ophthalmology, University of Washington, Seattle
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Abstract

By establishing an avascular, highly elastic, region within the fetal area of high acuity (AHA), the developing primate eye has created a unique substrate on which the mechanical forces of intraocular pressure (IOP) and growth-induced retinal stretch (stretch) can act. We proposed (Springer & Hendrickson, 2004b) that these forces generate both the pit and high cone density found in the adult AHA. In this paper, we use quantitative measures to determine the temporal relationships between nasal and temporal retinal elongation, changes in pit depth, cone packing, and cone morphology over M. nemestrina retinal development. Retinal length increased rapidly to about 105 days postconception (dpc; Phase 1) and then elongation virtually ceased (Phase 2) until just after birth (180 dpc). Retinal elongation due to stretch resumed during Phase 3 until approximately 315 dpc (4–5 months), after which time the retina appeared mature (Phase 4). The pit appeared during the quiescent Phase 2, suggesting that IOP acts, in conjunction with molecular changes in the inner retina, on the highly elastic, avascular, AHA to generate a deep, narrow pit and causes inner retinal cellular displacements. Subsequently (Phase 3), the pit widened, became 50% shallower and central inner retinal lamina thinned slightly due to a small amount of retinal stretch occurring in the AHA. Centripetal movement of cones was minimal until just after birth when the pit reached 88% of its maximal depth. Accelerated cone packing during Phase 3 was temporally correlated with increased stretch. A slight stretching of the central inner retina generates “lift” forces that cause the pit to become shallower and wider. In turn, these “lift” forces draw cones toward the center of the AHA (Springer, 1999). Localized changes in cone morphology associated with packing, included smaller cell body size, a change from a monolayer to a multilayered mound of cell bodies, elongation of inner segments and tilting of the apical portion toward the AHA. These changes began in cones overlying the edges of the pit, not its center. Henle cone axons formed initially in association with centrifugal displacement of the inner retina during pit formation, with an additional subsequent elongation due to cones moving centripetally. An integrated, two-factor model of AHA formation is presented. Initially, during the second half of gestation (Phase 2), IOP acts on the hyperelastic avascular zone of the AHA to generate a deep pit in the inner retina. In the first 4 months after birth (Phase 3), central retinal stretch generates tensile “lift” forces that remodel the pit and pack cones by drawing them toward the AHA center.

Keywords

MonkeyMechanicalFoveaModelMorphology
Type
Research Article
Information
Visual Neuroscience , Volume 22 , Issue 2 , March 2005 , pp. 171 - 185
Copyright
© 2005 Cambridge University Press

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