Cortical projections to the periaqueductal grey in the cat: a retrograde horseradish peroxidase study.
Stereotaxic fluid microinjections of horseradish peroxidase into different parts of the rostral and caudal periaqueductal grey (PAG) in cats have provided substantial retrograde evidence that the somatosensory cortex (I and II), frontal cortex, insular and cingular cortex are the principal sources of cortical-PAG projections. The somatosensory cortex II projects to all the regions of the rostral and caudal PAG. The frontal cortex projects to dorso-lateral quadrant of the PAG. The same projections were determined from insular and cingular cortex to PAG. The findings revealed a morphological substratum of corticofugal effects on PAG.
D000818:Animals; D002415:Cats; D002540:Cerebral Cortex / Q000033:anatomy & histology* / Q000503:physiopathology; D005625:Frontal Lobe / Q000033:anatomy & histology; D006179:Gyrus Cinguli / Q000033:anatomy & histology; D009434:Neural Pathways; D010146:Pain / Q000503:physiopathology; D010487:Periaqueductal Gray / Q000033:anatomy & histology* / Q000503:physiopathology; D013003:Somatosensory Cortex / Q000033:anatomy & histology