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spider visual system

Submitted by imadjidov on Fri, 12/06/2019 - 23:12

The secondary eye pathway of jumping spiders is complex compared to other spiders (Long 2019). Of interest for me are the optical glomeruli of the secondary eye medulla. Information from the secondary eyes is sent to the lamina, followed by the medulla. From the medulla, nerves project and combine in the mushroom body (Strausfeld et al. 1993). Unlike the mushroom body in insects, it is likely that the mushroom body in spiders is completely given over to vision. In insects, information from the lamina is passed to the medulla via a complete chiasma and this retains a panoramic field of view. In spiders, information from the lamina is chunked in the medulla before being passed to the mushroom body (Strausfeld, 2012). This prevents a panoramic view but may increase the spider's ability to quickly process motion information in discrete regions of the visual field. This may be particularly important for targeting the movement of the principal eyes. Retinotopic information from the lamina is passed to the protocerebrum simultaneously via a separate tract (Strausfeld, 2012).