Vision - Retina Development: Difference between revisions
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Revision as of 21:19, 15 March 2017
Embryology - 25 Apr 2024 Expand to Translate |
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Introduction
The retina and its development has been the subject of research from the early histology studies of Santiago Ramón y Cajal (1852 - 1934) and Camillo Golgi (1843 - 1926). It has a complex differentiation involving both a neural retina and a pigmented retina, in the embryo separated by a space and in the adult closely apposed to each other.
The retina is also a key focus of clinical research, as genetic or environmental damage and vision loss is generally a result of damage to the retinal cells or their processes. Retinitis pigments is a degenerative retinal disease. Retinoblastoma is retinal cancer that allowed researchers to identify retinoblastoma protein (Rb), the first identified tumour suppressor protein acting as a G1 cell cycle checkpoint.
Some Recent Findings
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More recent papers |
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This table allows an automated computer search of the external PubMed database using the listed "Search term" text link.
More? References | Discussion Page | Journal Searches | 2019 References | 2020 References Search term: Retina Embryology <pubmed limit=5>Retina Embryology</pubmed> |
Adult Retina
Vertebrates have ten identifiable layers formed from neurons, their processes (nerve fibers), membranes, photoreceptors and pigmented cells. Light must pass through nearly all these layers to the photoreceptors.
- Inner limiting membrane - Müller cell footplates.
- Nerve fiber layer - retinal ganglion axons eventually the optic nerve.
- Ganglion cell layer - neuronal cell bodies of retinal ganglion cells, their axons form the nerve fiber layer and eventually the optic nerve.
- Inner plexiform layer - another layer of neuronal processes.
- Inner nuclear layer - neuronal cell bodies
- Outer plexiform layer - another layer of neuronal processes.
- Outer nuclear layer - neuronal cell bodies
- External limiting membrane - layer separating inner segment portions of photoreceptors from their cell nuclei.
- Photoreceptor layer - rods and cones that convert light into signals.
- Retinal pigment epithelium.
Week 5
Week 8
The images below link to virtual slides of the human developing eye at Carnegie stage 22. Click on the image to open or select specific regions from the regions of interest links.
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Virtual Slide - Regions of Interest
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Links: Stage 22 | Embryo Virtual Slides
Retinal Pigment Epithelium
Retinal pigment epithelium (RPE) cells are generated directly from the optic neuroepithelium. The choroidal melanocytes, the other pigmented cells, are derived from neural crest cells that have migrated towards the eye.
Retinal pigment epithelium cells:
- cuboidal cells
- apical side form multiple villi
- these villi are in direct contact with the outer segments of the photoreceptor cells
- lateral sides are joined together by tight, adherens and gap junctions
- basal side contacts the underlying basal membrane (Bruch’s membrane)
Ciliary Body
A proposed model of ciliary body development begins with specification at the optic vesicle stage, when the neural retina and pigmented epithelium are also specified. The molecular signals could involve overlapping BMP and FGF signals. The lens has recently been shown in the chicken model to not be required for specification of the iris and ciliary body.[4]
References
- ↑ <pubmed>26410132</pubmed>
- ↑ <pubmed>22186726</pubmed>| PMC3243097 | Development
- ↑ <pubmed>22183394</pubmed>
- ↑ <pubmed>17275804</pubmed>
Online Textbooks
Reviews
- The International Journal of Developmental Biology (2004) Eye Development
<pubmed>19750521</pubmed> <pubmed>19427305</pubmed> <pubmed>18374618</pubmed> <pubmed>17914430</pubmed> <pubmed>17692298</pubmed> <pubmed>16920202</pubmed>
Bookshelf retina development
Articles
<pubmed>20532172</pubmed> <pubmed>20503381</pubmed> <pubmed>20237275</pubmed> <pubmed>20206598</pubmed> <pubmed>20152110</pubmed> <pubmed>20150723</pubmed> <pubmed>20130177</pubmed> <pubmed>20014102</pubmed> <pubmed>19933188</pubmed>
Search Pubmed
Search Pubmed: retina embryology
Search Entrez: retina embryology
Glossary Links
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Cite this page: Hill, M.A. (2024, April 25) Embryology Vision - Retina Development. Retrieved from https://embryology.med.unsw.edu.au/embryology/index.php/Vision_-_Retina_Development
- © Dr Mark Hill 2024, UNSW Embryology ISBN: 978 0 7334 2609 4 - UNSW CRICOS Provider Code No. 00098G