Primary motor cortex receives input from area 3a in macaques.
Intracortical microstimulation was used to define topographic sectors and the rostral border of primary motor cortex in adult macaques (Macaca mulatta). In the same animals, injections of fluorescent tracers were made within defined regions of primary motor cortex. Retrogradely labeled neurons were topographically distributed in area 3a, with most neurons located in layer III, and fewer neurons situated in layers V and IV. These findings suggest that muscle afferent information, thought to be important in a closed-loop mode of function, may reach primary motor cortex directly from cortical area 3a.
Huerta
M F
MF
Department of BioStructure and Function, University of Connecticut Health Center, Farmington 06030.
Pons
T P
TP
D000818:Animals; D004558:Electric Stimulation; D005456:Fluorescent Dyes; D008253:Macaca mulatta; D009044:Motor Cortex / Q000033:anatomy & histology / Q000502:physiology*; D009474:Neurons / Q000502:physiology
D005456:Fluorescent Dyes