Topographic organization of efferent projections of medial frontal cortex.

Topographic organization of efferent projections of medial frontal cortex.

Zeng D; Stuesse S L

Brain research bulletin

1993

1905-06

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.

Animals; Brain Mapping/*methods; Efferent Pathways/physiology; Female; Fluorescent Dyes; Frontal Lobe/*physiology; Male; Microinjections; Rats; Sprague-Dawley; Superior Colliculi/physiology; Tegmentum Mesencephali/physiology

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