Corneal microprojections in coleoid cephalopods

Talbot, Christopher, Jordan, Thomas M., Roberts, Nicholas W., Collin, Shaun P., Marshall, N. Justin and Temple, Shelby E. (2012) Corneal microprojections in coleoid cephalopods. Journal of Comparative Physiology A, 198 12: 849-856. doi:10.1007/s00359-012-0755-9


Author Talbot, Christopher
Jordan, Thomas M.
Roberts, Nicholas W.
Collin, Shaun P.
Marshall, N. Justin
Temple, Shelby E.
Total Author Count Override 6
Title Corneal microprojections in coleoid cephalopods
Journal name Journal of Comparative Physiology A   Check publisher's open access policy
ISSN 0340-7594
1432-1351
Publication date 2012-09
Sub-type Article (original research)
DOI 10.1007/s00359-012-0755-9
Volume 198
Issue 12
Start page 849
End page 856
Total pages 8
Place of publication Heidelberg, Germany
Publisher Springer
Collection year 2013
Language eng
Abstract The cornea is the first optical element in the path of light entering the eye, playing a role in image formation and protection. Corneas of vertebrate simple camera-type eyes possess microprojections on the outer surface in the form of microridges, microvilli, and microplicae. Corneas of invertebrates, which have simple or compound eyes, or both, may be featureless or may possess microprojections in the form of nipples. It was previously unknown whether cephalopods (invertebrates with camera-type eyes like vertebrates) possess corneal microprojections and, if so, of what form. Using scanning electron microscopy, we examined corneas of a range of cephalopods and discovered nipple-like microprojections in all species. In some species, nipples were like those described on arthropod compound eyes, with a regular hexagonal arrangement and sizes ranging from 75 to 103 nm in diameter. In others, nipples were nodule shaped and irregularly distributed. Although terrestrial invertebrate nipples create an antireflective surface that may play a role in camouflage, no such optical function can be assigned to cephalopod nipples due to refractive index similarities of corneas and water. Their function may be to increase surface-area-to-volume ratio of corneal epithelial cells to increase nutrient, gas, and metabolite exchange, and/or stabilize the corneal mucous layer, as proposed for corneal microprojections of vertebrates.
Keyword Antireflector
Cuttlefish
Octopus
Polarization vision
Visual ecology
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ
Additional Notes Published online: 16 September 2012.

Document type: Journal Article
Sub-type: Article (original research)
Collections: Queensland Brain Institute Publications
Official 2013 Collection
School of Biomedical Sciences Publications
 
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Created: Fri, 23 Nov 2012, 12:08:23 EST by Debra McMurtrie on behalf of Queensland Brain Institute