Neural organisation in the first optic ganglion of the nocturnal bee Megalopta genalis
Neural organisation in the first optic ganglion of the nocturnal bee Megalopta genalis
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DOI：
10.1007/s00441-004-0945-z
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发表时间：
2004-11-01
影响因子：
3.6
通讯作者：
Warrant, EJ
中科院分区：
文献类型：
--
作者：
Greiner, B;Ribi, WA;Warrant, EJ
夜间蜜蜂Megalopta genalis的第一视神经节（层）中的每个神经单元（盒）包含9个受体细胞轴突（6个短视觉纤维和3个长视觉纤维）和4种不同类型的一级中间神经元，也称为L-纤维（L1至L4）或层单极细胞。短视觉纤维终止于板层内，分为三种不同类型（svf 1、2、3）。这三条长的视觉纤维穿过椎板，但没有形成特征性的分支模式，并终止于第二个视神经节，即髓质。svf 2横向分支进入相邻的盒体的模式是hyperterans所独有的。此外，所有四种类型的L-纤维显示背腹排列，宽，在这个夜间蜜蜂的横向分支。这与昼夜蜜蜂Apis mellifera和Lasioglossum leucozonium形成对比，其中四种L-纤维类型中只有两种（L2和L4）到达相邻的盒。In M. L1形成两个亚型，即L1-a和L1-B; L1-B尤其具有接触几个相邻药筒的潜力。夜行性蜜蜂的L2和L4与昼行性蜜蜂的L2和L4相似，但背腹侧分支的宽度是前者的两倍。在夜行性蜜蜂中发现了一种新型的横向伸展的L3。M. L-纤维的广泛神经分支模式。genalis表明，这些神经元在大群小眼的光子空间总和中具有潜在的作用。夜间蜜蜂的这种特殊适应可以显着提高昏暗光线下的视觉可靠性。
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.