The structure of the central nervous system of jumping spiders of the genus Phidippus (Araneae:Salticidae) Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/m039k838p

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  • The central nervous system of Phidippus, while comparable to that of other spiders in most respects, is distinguished by the extraordinary development of visual processing centers, associated with the complex visually-directed behavior of these animals. The primary neuropile of the anterior medial eyes consists of two distinct columnar synapsing regions. There is some evidence that the geometry of this structure may correspond to the arrangement of receptors in the anterior medial eyes. First-order interneurons link this primary neuropile with a less structured, massive secondary neuropile at the top of the syncerebrum. The optic nerve fibers of each lateral eye synapse in a convoluted primary neuropile. Two distinct first order interneuron types join this neurcroile to a lateral eye neuropile and the protocerebrum on one hand, and to the glomerular layer of the corpora pedunculata on the other. Each of these interneurons branches to form two separate synapsing regions in the primary neuropile. The small optic nerve of the posterior medial eyes synapses in a glomerular neuropile. Large interneuron fibers associated with this neuropile lead to the protocerebrum. This structure suggests a special role for information provided by the posterior medial eyes, perhaps in the regulation of diurnal activity patterns. In the corpora pedunculata, intrinsic fibers synapse anteriorly with first-order interneurons of the lateral eyes, and form linear fibers bearing numerous synaptic glomeruli in the pedunculus. The latter is the site of extensive synapsing with extrinsic fibers. The corpora pedunculata are considered to be secondary visual centers, quite possibly concerned with directed orientation to visual stimuli. In structure they are the analogs, rather than the homologs, of similar structures observed in annelids and in other arthropods. This distinction supports the separation of the Chelicerata from the latter groups. The structure of the central body agrees with its accepted role as either a major association center, or as the source of complex programmed behavior.
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