Dual brain stem projection from the cortical masticatory area in guinea-pig.
The cortical masticatory area (CMA) in the guinea pig is subdivided into the anterior and posterior parts (A-CMA and P-CMA), based on the pattern of the CMA-induced rhythmical digastric EMG burst and the cytoarchitecture. The anterograde tracing of horseradish peroxidase from the A-CMA and P-CMA revealed, in addition to a common projection to the region around the trigeminal motor nucleus and the parvicellular reticular formation bilaterally, a massive projection to the ipsilateral superior colliculus (SC) from the A-CMA but not from the P-CMA. The results suggest a dual brain stem projection system from the CMA: the direct pyramidal route from the P-CMA and the SC-mediated indirect route from the A-CMA.
Enomoto
S
S
Department of Physiology, Faculty of Dentistry, Tokyo Medical and Dental University, Japan.
Kohase
H
H
Nakamura
Y
Y
D000818:Animals; D001933:Brain Stem / Q000502:physiology*; D002540:Cerebral Cortex / Q000502:physiology*; D004576:Electromyography; D006168:Guinea Pigs; D009434:Neural Pathways / Q000502:physiology; D013284:Stomatognathic System / Q000294:innervation*; D018998:Wheat Germ Agglutinin-Horseradish Peroxidase Conjugate
D018998:Wheat Germ Agglutinin-Horseradish Peroxidase Conjugate