Vision - Lens Development: Difference between revisions
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==Some Recent Findings== | ==Some Recent Findings== | ||
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* On the growth and internal structure of the human lens | * '''On the growth and internal structure of the human lens'''<ref><pubmed>20171212</pubmed></ref> "Growth of the human lens and the development of its internal features are examined using in vivo and in vitro observations on dimensions, weights, cell sizes, protein gradients and other properties. In vitro studies have shown that human lens growth is biphasic, asymptotic until just after birth and linear for most of postnatal life." | ||
* '''Activated Ras alters lens and corneal development'''<ref><pubmed>20105280</pubmed></ref> "The murine lens and cornea have a common embryonic origin and arise from adjacent regions of the surface ectoderm. ...Collectively, these results suggest that Ras activation a) induces distinct sets of downstream targets in the lens and cornea resulting in distinct cellular responses and b) is sufficient for initiation but not completion of lens fiber differentiation." | |||
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==Development Overview== | ==Development Overview== |
Revision as of 16:56, 22 September 2010
Introduction
--Mark Hill 00:27, 7 June 2010 (EST) Template page only.
The lens or crystalline lens or aquula (Latin, aquula = a little stream) has a key role in focussing light (with the cornea) upon the neural retina. The lens embryonic origin is from surface ectoderm of the sensory placodes that form in the head region (More? Week 4 - Placodes). The lens focusses by refracting light as it passes through the biconvex lens, which can be altered in shape (accommodation) by surrounding ciliary muscles. These ciliary muscles are activated (contracted) by parasympathetic innervation from the ciliary ganglion itself innervated by the oculomotor nerve (Cranial Nerve III) (More? Cranial Nerves).
Some Recent Findings
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Development Overview
surface ectoderm -> lens placode -> lens pit -> lens vesicle -> lens fibres -> lens capsule and embryonic/fetal nucleus.
References
Glossary Links
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Cite this page: Hill, M.A. (2024, June 26) Embryology Vision - Lens Development. Retrieved from https://embryology.med.unsw.edu.au/embryology/index.php/Vision_-_Lens_Development
- © Dr Mark Hill 2024, UNSW Embryology ISBN: 978 0 7334 2609 4 - UNSW CRICOS Provider Code No. 00098G