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Neural organisation in the first optic ganglion of the nocturnal bee Megalopta genalis

Greiner, Birgit LU ; Ribi, WA; Wcislo, WT and Warrant, Eric LU (2004) In Cell and Tissue Research1974-01-01+01:00 318(2). p.429-437
Abstract
Each neural unit (cartridge) in the first optic ganglion (lamina) of the nocturnal bee Megalopta genalis contains nine receptor cell axons (6 short and 3 long visual fibres), and four different types of first-order interneurons, also known as L-fibres (L1 to L4) or lamina monopolar cells. The short visual fibres terminate within the lamina as three different types (svf 1, 2, 3). The three long visual fibres pass through the lamina without forming characteristic branching patterns and terminate in the second optic ganglion, the medulla. The lateral branching pattern of svf 2 into adjacent cartridges is unique for hymenopterans. In addition, all four types of L-fibres show dorso-ventrally arranged, wide, lateral branching in this nocturnal... (More)
Each neural unit (cartridge) in the first optic ganglion (lamina) of the nocturnal bee Megalopta genalis contains nine receptor cell axons (6 short and 3 long visual fibres), and four different types of first-order interneurons, also known as L-fibres (L1 to L4) or lamina monopolar cells. The short visual fibres terminate within the lamina as three different types (svf 1, 2, 3). The three long visual fibres pass through the lamina without forming characteristic branching patterns and terminate in the second optic ganglion, the medulla. The lateral branching pattern of svf 2 into adjacent cartridges is unique for hymenopterans. In addition, all four types of L-fibres show dorso-ventrally arranged, wide, lateral branching in this nocturnal bee. This is in contrast to the diurnal bees Apis mellifera and Lasioglossum leucozonium, where only two out of four L-fibre types (L2 and L4) reach neighbouring cartridges. In M. genalis, L1 forms two sub-types, viz. L1-a and L1-b; L1-b in particular has the potential to contact several neighbouring cartridges. L2 and L4 in the nocturnal bee are similar to L2 and L4 in the diurnal bees but have dorso-ventral arborisations that are twice as wide. A new type of laterally spreading L3 has been discovered in the nocturnal bee. The extensive neural branching pattern of L-fibres in M. genalis indicates a potential role for these neurons in the spatial summation of photons from large groups of ommatidia. This specific adaptation in the nocturnal bee could significantly improve reliability of vision in dim light. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
female (Insecta), compound eye, visual system, first optic ganglion, retinula cell axons, spatial summation, first-order interneurons, nocturnal bee, Megalopta genalis
in
Cell and Tissue Research1974-01-01+01:00
volume
318
issue
2
pages
429 - 437
publisher
Springer
external identifiers
  • wos:000224733300014
  • pmid:15365811
  • scopus:8644230785
ISSN
1432-0878
DOI
10.1007/s00441-004-0945-z
language
English
LU publication?
yes
id
2931d281-42ca-4281-8e5a-7d1b72abb972 (old id 262897)
date added to LUP
2007-10-29 09:30:17
date last changed
2017-12-17 03:30:03
@article{2931d281-42ca-4281-8e5a-7d1b72abb972,
  abstract     = {Each neural unit (cartridge) in the first optic ganglion (lamina) of the nocturnal bee Megalopta genalis contains nine receptor cell axons (6 short and 3 long visual fibres), and four different types of first-order interneurons, also known as L-fibres (L1 to L4) or lamina monopolar cells. The short visual fibres terminate within the lamina as three different types (svf 1, 2, 3). The three long visual fibres pass through the lamina without forming characteristic branching patterns and terminate in the second optic ganglion, the medulla. The lateral branching pattern of svf 2 into adjacent cartridges is unique for hymenopterans. In addition, all four types of L-fibres show dorso-ventrally arranged, wide, lateral branching in this nocturnal bee. This is in contrast to the diurnal bees Apis mellifera and Lasioglossum leucozonium, where only two out of four L-fibre types (L2 and L4) reach neighbouring cartridges. In M. genalis, L1 forms two sub-types, viz. L1-a and L1-b; L1-b in particular has the potential to contact several neighbouring cartridges. L2 and L4 in the nocturnal bee are similar to L2 and L4 in the diurnal bees but have dorso-ventral arborisations that are twice as wide. A new type of laterally spreading L3 has been discovered in the nocturnal bee. The extensive neural branching pattern of L-fibres in M. genalis indicates a potential role for these neurons in the spatial summation of photons from large groups of ommatidia. This specific adaptation in the nocturnal bee could significantly improve reliability of vision in dim light.},
  author       = {Greiner, Birgit and Ribi, WA and Wcislo, WT and Warrant, Eric},
  issn         = {1432-0878},
  keyword      = {female (Insecta),compound eye,visual system,first optic ganglion,retinula cell axons,spatial summation,first-order interneurons,nocturnal bee,Megalopta genalis},
  language     = {eng},
  number       = {2},
  pages        = {429--437},
  publisher    = {Springer},
  series       = {Cell and Tissue Research1974-01-01+01:00},
  title        = {Neural organisation in the first optic ganglion of the nocturnal bee Megalopta genalis},
  url          = {http://dx.doi.org/10.1007/s00441-004-0945-z},
  volume       = {318},
  year         = {2004},
}