Ultrastructure of the ocellar visual system in normal and mutant Drosophila melanogaster

Journal of Neurogenetics
W S StarkS D Carlson

Abstract

Between the two compound eyes on the vertex on the adult head are the three simple eyes, ocelli. Transmission and scanning electron microscopy were used to investigate the corneal lenses, ocellar photoreceptors, and axonal projections in normal and mutant Drosophila melanogaster. In wild type flies, the cornea consists of about 45 lamellae. It has corneal nipples distally and is underlaid with a monolayer of corneagenous cells. Retinula cells have open rhabdomeres of about 2 microns (diameter) x 7 microns (length). Rhabdomeres extend to the distal extent of the cell and do not have caps. Microvilli have a rodlet within. Retinula cells are joined by belt desmosomes on the lateral borders. Eye color pigment granules are housed within the retinula cells of normal flies, not in accessory cells. The granules do not migrate in response to light. No screening pigment granules exist in the white mutant. Each ocellus has about 80 retinula cells whose axons project to corresponding ganglia from which 4 giant afferent interneurons (per ganglion) project to the brain. receptor terminals are invested with capitate projections from glia. Receptors synapse onto dyads of follower cells, usually interneuron processes, at sites of T shaped presy...Continue Reading

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Citations

Jul 1, 1991·Journal of Neurocytology·R J SappW S Stark
Nov 21, 2002·Tissue & Cell·T C Insausti, C R Lazzari
Feb 15, 1993·Proceedings of the National Academy of Sciences of the United States of America·D G BallingerK D Harshman
May 23, 2012·European Journal of Cell Biology·Monalisa MishraElisabeth Knust
Apr 11, 2012·Biochimica Et Biophysica Acta·Padinjat RaghuNaresh Babu Naidu Mallampati
Jan 30, 2010·Progress in Neurobiology·Tara N Edwards, Ian A Meinertzhagen
Mar 15, 2016·The Journal of Comparative Neurology·Alexandra Saint-CharlesFrançois Rouyer
Aug 28, 2016·Developmental Biology·Qingxiang ZhouFrancesca Pignoni
Dec 15, 1996·Microscopy Research and Technique·R D LeeW S Stark
Nov 1, 1991·Journal of Neurochemistry·P V Sarthy
Oct 13, 2009·Journal for Nurses in Staff Development : JNSD : Official Journal of the National Nursing Staff Development Organization·Marsha L Moore
Jun 11, 2021·Frontiers in Synaptic Neuroscience·Ronald S PetraliaYa-Xian Wang
Jul 28, 2021·PLoS Genetics·Abhishek Kumar MishraSimon G Sprecher

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