Difference between revisions of "Sensory - Vision Development"

From Embryology
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===Reviews===
 
===Reviews===
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<pubmed>20855501</pubmed>|  [http://jcb.rupress.org/content/190/6/953.full JCB]
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The International Journal of Developmental Biology [http://www.ijdb.ehu.es/web/contents.php?vol=51&issue=6-7 Vol. 51 Nos. 6/7 (2007) Ear Development]
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* The International Journal of Developmental Biology [http://www.ijdb.ehu.es/web/contents.php?vol=51&issue=6-7 Vol. 51 Nos. 6/7 (2007) Ear Development]
 
* '''Journal of Cell Biology''' [http://jcb.rupress.org/cgi/collection/cell_biol_of_senses The Cell Biology of the Senses] - [http://jcb.rupress.org/content/190/6/953.full The cell biology of vision] September 20, 2010.
 
  
 
'''Bookshelf'''  [http://www.ncbi.nlm.nih.gov/sites/entrez?db=Books&cmd=search&term=vision%20development vision development]
 
'''Bookshelf'''  [http://www.ncbi.nlm.nih.gov/sites/entrez?db=Books&cmd=search&term=vision%20development vision development]

Revision as of 10:05, 21 September 2011

Introduction

Historic retina drawing.jpg

These notes introduce the development of the eye: induction and regional specification of the eye structures, maturation and formation of retina and optic tectum neuronal connections. The adult eye has contributions from several different embryonic layers eventually forming neuronal, supportive connective tissue, optical structures, and muscular tissues. Additional pages are being developed to cover specific issues of this anatomical structure.

Vision Links: vision | lens | retina | placode | extraocular muscle | cornea | eyelid | lacrima gland | vision abnormalities | Student project 1 | Student project 2 | Category:Vision | sensory
Historic Vision 
Historic Embryology: 1906 Eye Embryology | 1907 Development Atlas | 1912 Eye Development | 1912 Nasolacrimal Duct | 1917 Extraocular Muscle | 1918 Grays Anatomy | 1921 Eye Development | 1922 Optic Primordia | 1925 Eyeball and optic nerve | 1925 Iris | 1927 Oculomotor | 1928 Human Retina | 1928 Retina | 1928 Hyaloid Canal | Historic Disclaimer
Senses Links: Introduction | placode | Hearing and Balance hearing | balance | vision | smell | taste | touch | Stage 22 | Category:Sensory

Some Recent Findings

Adult Human Retina histology[1]
  • Rearrangement of retinogeniculate projection patterns after eye-specific segregation in mice[2] "When monocular enucleation was performed after eye-specific segregation, rearrangement of retinogeniculate axons in the dorsal lateral geniculate nucleus (dLGN) was observed within 5 days. ...We also examined the critical period for this rearrangement and found that the rearrangement became almost absent by the beginning of the critical period for ocular dominance plasticity in the primary visual cortex."
  • The long noncoding RNA RNCR2 directs mouse retinal cell specification[3]"We find that the RNCR2 is selectively expressed in a subset of both mitotic progenitors and postmitotic retinal precursor cells. ShRNA-mediated knockdown of RNCR2 results in an increase of both amacrine cells and Müller glia, indicating a role for this lncRNA in regulating retinal cell fate specification."

Timeline

Weeks 3-4 Eye Fields-Optic Vesicle

Weeks 5-6 Optic Cup, Lens Vesicle, Choroid Fissure, Hyaloid Artery

Weeks 7-8 Cornea, Anterior Chamber, Pupillary Membrane, Lens, Retina

Weeks 9-15 Iris, Ciliary Body

Weeks 8-10 Eyelids


Lens

Human Lens (stage 22)

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).

surface ectoderm -> lens placode -> lens pit -> lens vesicle -> lens fibres -> lens capsule and embryonic/fetal nucleus.

Retinotopic Map

This neuroscience term describes how the developing retina is precisely "mapped" onto the visual cortex through a series of signaling and activity dependent mechanisms. This follows from Hubel and Wiesel (1981 Nobel Prize in Physiology or Medicine) key discoveries (1959-70) of how in development system matching occurs in the visual system. The topographic map establishes an ordered neuronal connection between sensory structures and the central nervous system.

The retinotectal map (eye to brain) of birds (lower vertebrates):

  • temporal (posterior) retina is connected to the rostral (anterior) part of the contralateral optic tectum
  • nasal (anterior) retina to the caudal (posterior) tectum
  • ventral retina to the dorsal (medial) tectum
  • dorsal ventral (lateral) tectum

Retinal waves a form of coordinated spontaneous activity that occurs in the developing retina. These waves of electrical activity (action potentials) are thought to have a role in establishing the initial retinotopic map by correlating/coordinating the activity of neighbouring retinal ganglion cells.

EphA/ephrin-A molecular signaling also thought to have a role in establishing the initial retinotopic map.

Neural Crest

Mouse eye neural crest.jpg

Mouse eye neural crest[4]

Mouse eye TGF-beta model.jpg

Mouse eye TGF-beta model[4]

Links: Image - Mouse eye neural crest | Image - Mouse eye TGF-beta model | Vision Development | Neural Crest Development | Head Development

Additional Images

Historic Images

References

  1. <pubmed>12186651</pubmed>| Genome Biol.
  2. <pubmed>20544023</pubmed>| PLoS ONE
  3. <pubmed>20459797</pubmed>
  4. 4.0 4.1 <pubmed>16403239</pubmed>| J Biol.

Online Textbooks

Reviews

<pubmed>20855501</pubmed>| JCB

The International Journal of Developmental Biology Vol. 51 Nos. 6/7 (2007) Ear Development


Bookshelf vision development

Search Pubmed

Search Pubmed: vision development | eye development | eye embryology | retina embryology | lens embryology


Search Entrez: vision development | eye development | eye embryology | retina embryology | lens embryology

Terms

  • retina - The stratified sensory structure of the eye, formed from the neural ectoderm that extends from the forebrain (diencephalon) to form initially the folded optic cup. Vertebrates have ten identifiable layers formed from nerve fibers, neurons, membranes, photoreceptors and pigmented cells. Light must pass through nearly all these layers to the photoreceptors. (1. Inner limiting membrane - Müller cell footplates; 2. Nerve fiber layer; 3. Ganglion cell layer - layer of retinal ganglion cells their axons form the nerve fiber layer and eventually the optic nerve; 4. Inner plexiform layer - another layer of neuronal processes; 5. Inner nuclear layer; 6. Outer plexiform layer; 7. Outer nuclear layer; 8. External limiting membrane - layer separating inner segment portions of photoreceptors from their cell nuclei; 9. Photoreceptor layer - rods and cones that convert light into signals; 10. Retinal pigment epithelium).
  • retinal pigment epithelium - (RPE) An epethial pigmented cell layer lying outside the sensory retina, formed from the outer layer of the folded optic cup. The RPE is firmly attached to the underlying choroid and overlying retinal visual cells, for which it has a nutritional role.
  • retinal waves - A form of coordinated spontaneous activity that occurs in the developing retina. These waves of electrical activity (action potentials) along with EphA/ephrin-A signaling are thought to have a role in establishing the initial retinotopic map by correlating/coordinating the activity of neighbouring retinal ganglion cells.

External Links

External Links Notice - The dynamic nature of the internet may mean that some of these listed links may no longer function. If the link no longer works search the web with the link text or name. Links to any external commercial sites are provided for information purposes only and should never be considered an endorsement. UNSW Embryology is provided as an educational resource with no clinical information or commercial affiliation.


Glossary Links

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Cite this page: Hill, M.A. (2020, June 3) Embryology Sensory - Vision Development. Retrieved from https://embryology.med.unsw.edu.au/embryology/index.php/Sensory_-_Vision_Development

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© Dr Mark Hill 2020, UNSW Embryology ISBN: 978 0 7334 2609 4 - UNSW CRICOS Provider Code No. 00098G