Topographic organization of efferent projections of medial frontal cortex.
By using fluorescent retrograde tracers, we compared efferent projections of the medial frontal cortex to two subcortical areas: the superior colliculus, a somatic motor area, and the laterodorsal tegmental nucleus, a visceral motor area. Neurons projecting to the superior colliculus originated in layer V of the cingulate (Cg1 area) and medial agranular cortex, while neurons projecting to the laterodorsal tegmental nucleus originated in layers V and VI of the cingulate (Cg3 area) and infralimbic cortex. Thus, within the medial frontal cortex, the ventral portion (the Cg3 and infralimbic areas) may be a visceral motor area while the dorsal portion is a somatic motor region.
Zeng
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Neurobiology Department, N.E. Ohio Universities College of Medicine, Rootstown 44272.
Stuesse
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SL
D000818:Animals; D001931:Brain Mapping / Q000379:methods*; D004525:Efferent Pathways / Q000502:physiology; D005260:Female; D005456:Fluorescent Dyes; D005625:Frontal Lobe / Q000502:physiology*; D008297:Male; D008845:Microinjections; D051381:Rats; D017207:Rats, Sprague-Dawley; D013477:Superior Colliculi / Q000502:physiology; D013681:Tegmentum Mesencephali / Q000502:physiology
D005456:Fluorescent Dyes