Projections from the medial agranular cortex to brain stem visuomotor centers in rats.

Projections from the medial agranular cortex to brain stem visuomotor centers in rats.

Stuesse S L; Newman D B

Experimental brain research

1990

1990

Projections from medial agranular cortex to brain stem in rat were determined by use of the anterograde tracers Phaseolus vulgaris leucoagglutinin, or wheat germ agglutinin conjugated horseradish peroxidase. Axonal trajectories were also followed by means of the Wiitanen modification of the Fink-Heimer degeneration technique. AGm was identified on the basis of its cytoarchitectonics. AGm projected to the anterior pretectal nucleus, the rostral interstitial nucleus of the medial longitudinal fasciculus, the medial accessory oculomotor nucleus of Bechterew, the interstitial nucleus of Cajal, the nucleus of Darkschewitsch, the nucleus cuneiformis and subcuneiformis, intermediate and deep superior collicular layers, the paramedian pontine reticular formation (reticularis pontis oralis and caudalis, and reticularis gigantocellularis), and raphe centralis superior. Differences in connections between rostral and caudal injections were observed: pontine and medullary projections were lighter from the rostral portion of AGm than from the more caudal portions of AGm. The heaviest projections to the anterior pretectal nucleus were from the caudal portion of AGm. The subcortical projections were very similar to those described for the frontal eye field in monkeys, and the majority of them targeted areas thought to be involved in coordination of gaze with head and neck movements. Thus AGm in rats may contain the homologue of the primate frontal eye fields.

Female; Male; Animals; Immunohistochemistry; Rats; Wheat Germ Agglutinin-Horseradish Peroxidase Conjugate; Horseradish Peroxidase; Wheat Germ Agglutinins; Brain Stem/*cytology; Cerebral Cortex/*cytology; Phytohemagglutinins; Visual Pathways/*anatomy & histology; Inbred Strains

Article information provided for research and reference use only. All rights are retained by the journal listed under publisher and/or the creator(s).

532–544

3

80