NDLI: Retinal development in the lobster Homarus americanus : Comparison with compound eyes of insects and other crustaceans

Content Provider	Springer Nature Link
Author	Hafner, G. Tokarski, T.
Copyright Year	2001
Abstract	Pattern formation and ommatidial differentiation were examined in the developing retina of the lobster Homarus americanus using light and electron microscopy. In the lobster the retina differentiates from the surface ectoderm that covers the optic primordia. Initially a single band of proliferation moves across this surface ectoderm. Immediately following this wave of proliferation, rows of ommatidial cell clusters appear. The earliest cell clusters are often seen adjacent to dividing cells of the proliferation band. The changing organization of the first seven rows of ommatidial clusters, visible at the surface of the retina, reveals events in early ommatidial differentiation. A rosette-like cluster of 18 cells forms the first row. Each stage following the rosette clusters occurs in a separate staggered row. Developing ommatidia have a central cluster of retinula cells, whose organization changes at each stage. Four cone cells enclose the retinula cells in each cluster and extend to the surface. In the seventh row, rhabdome formation begins and the retinula cells recede, leaving only cone cells visible at the retinal surface. This change initiates the two-tiered organization of the adult ommatidium. In 70% embryos, asymmetries in the position of the R8 axon around R7 create an equatorial line separating the dorsal and ventral halves of the retina. Possible mechanisms for the formation of these asymmetries are discussed. Postembryonic growth of the retina continues in stage VI juvenile animals along the ventral edge of the retina.
Starting Page	147
Ending Page	158
Page Count	12
File Format	PDF
ISSN	0302766X
Journal	Cell and Tissue Research
Volume Number	305
Issue Number	1
e-ISSN	14320878
Language	English
Publisher	Springer-Verlag
Publisher Date	2014-01-30
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Human Genetics Proteomics Molecular Medicine
Content Type	Text
Resource Type	Article
Subject	Cell Biology Histology Pathology and Forensic Medicine

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