Projections of the temporo-parietal cortex on vestibular complex in the macaque monkey (Macaca fascicularis).
Connections of the posterior parietal cortex (area 7) with the vestibular complex have been studied in 4 macaque monkeys by anterograde axonal transport methods. WGA-HRP and tritiated amino-acids have been injected in the posterior part of area 7 including the caudal end of the superior bank of superior temporal sulcus and the lateral sulcus. Labeled terminals were observed in the vestibular nuclei complex and distributed bilaterally with a greater ipsilateral contribution. Two main groups of area 7 efferences were found to project to vestibular complex: a) A first group terminates on vestibular nuclei (the inferior vestibular nucleus and the caudal part of the medial nucleus) mainly connected with cerebello-spinal system. b) A second group terminates on vestibular nuclei (the medial and the superior vestibular nuclei and the y group) mainly involved in vestibulo-ocular mechanisms. The prepositus hypoglossi nucleus has also been found to receive area 7 projections. It is concluded that the possible control played by area 7 on the vestibulo-ocular reflex might be exerted through these direct cortico-vestibular projections.
Ventre
J
J
Laboratoire de Neuropsychologie Expérimentale, INSERM, Unité 94, Bron, France.
Faugier-Grimaud
S
S
D000344:Afferent Pathways / Q000033:anatomy & histology; D000818:Animals; D001370:Axonal Transport; D006735:Horseradish Peroxidase; D007002:Hypoglossal Nerve / Q000033:anatomy & histology; D008251:Macaca / Q000033:anatomy & histology*; D008252:Macaca fascicularis / Q000033:anatomy & histology*; D010296:Parietal Lobe / Q000033:anatomy & histology*; D014316:Tritium; D014726:Vestibular Nuclei / Q000033:anatomy & histology*; D018998:Wheat Germ Agglutinin-Horseradish Peroxidase Conjugate; D014909:Wheat Germ Agglutinins
D018998:Wheat Germ Agglutinin-Horseradish Peroxidase Conjugate; D014909:Wheat Germ Agglutinins; D014316:Tritium; D006735:Horseradish Peroxidase