Periventricular efferent neurons in the optic tectum of rainbow trout

2006 ◽  
Vol 499 (4) ◽  
pp. 546-564 ◽  
Author(s):  
Masae Kinoshita ◽  
Etsuro Ito ◽  
Akihisa Urano ◽  
Hironobu Ito ◽  
Naoyuki Yamamoto
Keyword(s):  
Rainbow Trout ◽  
Optic Tectum ◽  
Efferent Neurons

Long-term potentiation in the optic tectum of rainbow trout

2004 ◽  
Vol 370 (2-3) ◽  
pp. 146-150 ◽  
Author(s):  
Masae Kinoshita ◽  
Toshiyuki Hosokawa ◽  
Akihisa Urano ◽  
Etsuro Ito
Keyword(s):  
Rainbow Trout ◽  
Optic Tectum ◽  
Long Term Potentiation ◽  
Term Potentiation

Organization of ascending projections from the optic tectum and mesencephalic pretectal gray in Rana pipiens

1991 ◽  
Vol 7 (5) ◽  
pp. 459-478 ◽  
Author(s):  
Neil M. Montgomery ◽  
Katherine V. Fite
Keyword(s):  
Optic Tectum ◽  
Spatial Organization ◽  
Rana Pipiens ◽  
Optic Chiasm ◽  
Terrestrial Vertebrates ◽  
Dorsal Nucleus ◽  
Caudal Portion ◽  
Efferent Neurons ◽  
Lateral Nucleus ◽  
Superficial Portion

AbstractThe ascending projections from the dorsal mesencephalon to the thalamus and pretectum in Rana pipiens were investigated by using the anterograde and retrograde transport of HRP with regard to two major issues:(1) the degree of tectotopic organization in the projections, and (2) their cells of origin.The results indicate that the spatial organization of the tecto-thalamic tract is specifically related to the laminar organization of the contributing tectal efferent neurons. Axons of neurons in the superficial portion of tectal layer 8 exit the tectum through layer 9 and travel in the superficial portion of the dorsal and ventral tecto-thalamic tracts and innervate the nucleus lentiformis mesencephali, the posterior lateral dorsal nucleus, and corpus geniculatum. The distribution of terminals within these structures varied with the tectal HRP-injection site. HRP injections in the ventral tecto-thalamic tract retrogradely labeled neurons in the superficial portion of tectal layer 8 across the lateral and caudal portion of the tectal lobe. HRP injections into the dorsal tecto-thalamic tract, at the level of the pretectum, retrogradely labeled pyriform neurons in the superficial portion of tectal layer 8 in the rostral and medial portions of the tectal lobe.With regard to the deep tectal layers, axons from pyramidal neurons in layer 6 and ganglionic neurons in layer 8 leave the tectum through layer 7, travel in both the dorsal and ventral tecto-thalamic tracts, and are located internal to the axons of the pyriform neurons of superficial tectal layer 8. The majority of the ganglionic neurons project to the posterior lateral ventral nucleus and the anterior lateral nucleus. The distribution of terminals within these nuclei did not display a tectotopic organization.A second major projection to the thalamus originates from the mesencephalic pretectal gray and innervates the nucleus lentiformis mesencephali, the posterior lateral dorsal nucleus, the anterior lateral nucleus, dorsal and ventral divisions of the ventral lateral thalamus, and the nucleus of Bellonci. Other axons from the mesencephalic pretectal gray terminate in the contralateral, medial portions of the posterior lateral dorsal thalamus, the ventral lateral thalamus, and the anterior lateral nucleus.The isthmo-tectal projection was also retrogradely labeled following tectal injections of HRP. This pathway travels in the most ventral portion of the ventral tecto-thalamic tract; its axons passed over the lateral margin of the endopeduncular nucleus bilaterally, and crossed the midline in the caudal portion of the optic chiasm. Extensive, bead-like varicosities were observed on these axons both in the endopeduncular nucleus and in the posterior optic chiasm.These results, taken together with those from other species, strongly suggest that a common organizational plan exists among terrestrial vertebrates with regard to the specific pattern of innervation of pretectal and thalamic nuclei by either the optic tectum or the superior colliculus.

scholarly journals Functional segregation of retinal ganglion cell projections to the optic tectum of rainbow trout

2015 ◽  
Vol 114 (5) ◽  
pp. 2703-2717 ◽  
Author(s):  
Iñigo Novales Flamarique ◽  
Matt Wachowiak
Keyword(s):  
Rainbow Trout ◽  
Ganglion Cell ◽  
Optic Tectum ◽  
Visual Information ◽  
Activity Patterns ◽  
Chromatic Adaptation ◽  
Retinal Cell ◽  
Fiber Types ◽  
Dynamic Activity ◽  
Local Circuitry

The interpretation of visual information relies on precise maps of retinal representation in the brain coupled with local circuitry that encodes specific features of the visual scenery. In nonmammalian vertebrates, the main target of ganglion cell projections is the optic tectum. Although the topography of retinotectal projections has been documented for several species, the spatiotemporal patterns of activity and how these depend on background adaptation have not been explored. In this study, we used a combination of electrical and optical recordings to reveal a retinotectal map of ganglion cell projections to the optic tectum of rainbow trout and characterized the spatial and chromatic distribution of ganglion cell fibers coding for increments (ON) and decrements (OFF) of light. Recordings of optic nerve activity under various adapting light backgrounds, which isolated the input of different cone mechanisms, yielded dynamic patterns of ON and OFF input characterized by segregation of these two fiber types. Chromatic adaptation decreased the sensitivity and response latency of affected cone mechanisms, revealing their variable contributions to the ON and OFF responses. Our experiments further demonstrated restricted input from a UV cone mechanism to the anterolateral optic tectum, in accordance with the limited presence of UV cones in the dorsotemporal retina of juvenile rainbow trout. Together, our findings show that retinal inputs to the optic tectum of this species are not homogeneous, exhibit highly dynamic activity patterns, and are likely determined by a combination of biased projections and specific retinal cell distributions and their activity states.

scholarly journals Latencies and discharge patterns of color-opponent neurons in the rainbow trout optic tectum

1999 ◽  
Vol 39 (17) ◽  
pp. 2795-2799 ◽  
Author(s):  
C.G. McDonald ◽  
C.W. Hawryshyn
Keyword(s):  
Rainbow Trout ◽  
Optic Tectum ◽  
Discharge Patterns

Retinotectal transmission in the optic tectum of rainbow trout

2005 ◽  
Vol 484 (2) ◽  
pp. 249-259 ◽  
Author(s):  
Masae Kinoshita ◽  
Masahiro Fukaya ◽  
Takuro Tojima ◽  
Satoshi Kojima ◽  
Hironori Ando ◽  
...  
Keyword(s):  
Rainbow Trout ◽  
Optic Tectum ◽  
Retinotectal Transmission

Neuromodulatory effects of gonadotropin-releasing hormone on retinotectal synaptic transmission in the optic tectum of rainbow trout

2007 ◽  
Vol 25 (2) ◽  
pp. 480-484 ◽  
Author(s):  
Masae Kinoshita ◽  
Suguru Kobayashi ◽  
Akihisa Urano ◽  
Etsuro Ito
Keyword(s):  
Rainbow Trout ◽  
Synaptic Transmission ◽  
Optic Tectum ◽  
Gonadotropin Releasing Hormone ◽  
Releasing Hormone

Multiple-site optical recording for characterization of functional synaptic organization of the optic tectum of rainbow trout

2002 ◽  
Vol 16 (5) ◽  
pp. 868-876 ◽  
Author(s):  
Masae Kinoshita ◽  
Risa Ueda ◽  
Satoshi Kojima ◽  
Katsushige Sato ◽  
Masahiko Watanabe ◽  
...  
Keyword(s):  
Rainbow Trout ◽  
Optic Tectum ◽  
Optical Recording ◽  
Synaptic Organization ◽  
Multiple Site
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