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The pretectal complex in the opossum didelphis marsupialis aurita projections from the striate cortex and correlation with retinal terminal fields


Brain Research 207(2): 267-278
The pretectal complex in the opossum didelphis marsupialis aurita projections from the striate cortex and correlation with retinal terminal fields
Two terminal fields were revealed in the pretectal complex of the opossum [D. marsupialis aurita] by the Fink-Heimer method after striate cortical lesions. A rostal field is located within a rostrolateral strip of the compact part of the anterior pretectal nucleus, where a partial topographic arrangement of this projection is present. A caudal field is located within the sub-brachial nucleus of the optic tract, located between the brachium of the superior colliculus and the posterior pretectal nucleus. The corticotopic projection to this field is mirror-symmetric to that found in the superior colliculus, and overlaps a bilateral projection from the retina. Based on hodological evidence, the nucleus of the optic tract in the opossum can apparently be subdivided in an intrabrachial nucleus receiving a direct projection from the contralateral retina, and a sub-brachial nucleus receiving projections from both retinae and from the striate cortex. The pretectal complex, as the superior colliculus, can be anatomically subdivided in a superficial region receiving visual input (the optic pretectum) and a deep region only remotely connected to the visual system. The optic pretectum differs from the superior colliculus in displaying a multiple-map arrangement within its constituent nuclei, instead of a single continuous representation of the visual field.


Accession: 006740107



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