Reticulo-collicular projections: a neuronal tracing study in the rat

Neuroanatomical tract-tracing methods were used to study the topography of the reticulocollicular projections. Injections of gold-HRP or BDA tracers into the medial and/or central portions of the superior colliculus resulted in labelled neurones mainly in the medial reticular formation, whereas inje...

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Bibliographic Details
Published in:Neuroscience letters 2005-06, Vol.380 (3), p.276-279
Main Authors: Smit, Albertine Ellen, Zerari-Mailly, Fawzia, Buisseret, Pierre, Buisseret-Delmas, Catherine, VanderWerf, Frans
Format: Article
Language:English
Subjects:
Animals
Biological and medical sciences
Biotin - analogs & derivatives
Blinking
Blinking - physiology
Brain Mapping
Dextrans
Eye and associated structures. Visual pathways and centers. Vision
Eye Movements - physiology
Fundamental and applied biological sciences. Psychology
Gold
Horseradish Peroxidase
Neural Pathways - cytology
Neural Pathways - physiology
Neurons - cytology
Neurons - physiology
Psychomotor Performance - physiology
Rat
Rats
Rats, Sprague-Dawley
Reticular formation
Reticular Formation - cytology
Reticular Formation - physiology
Retrograde tracer Gold/HRP
Rhombencephalon - cytology
Rhombencephalon - physiology
Superior Colliculi - cytology
Superior Colliculi - physiology
Superior colliculus
Vertebrates: nervous system and sense organs
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Summary:Neuroanatomical tract-tracing methods were used to study the topography of the reticulocollicular projections. Injections of gold-HRP or BDA tracers into the medial and/or central portions of the superior colliculus resulted in labelled neurones mainly in the medial reticular formation, whereas injections into the lateral portion of the superior colliculus showed labelling in the medial and lateral reticular formation. When tracer was injected into the lateral portion of the caudal superior colliculus, extensive lateral labelling was observed in the contralateral parvocellular reticular nucleus and the contralateral dorsal medullary reticular nucleus, two areas involved in reflex blinking. The present study shows that these reticular areas project to the lateral superior colliculus, which is known to be involved in the coordination of eye and eyelid movements.
ISSN:0304-3940
1872-7972
DOI:10.1016/j.neulet.2005.01.059