title: Afferent and efferent connections of the nucleus rotundus demonstrated by WGA-HRP in the chick.
abstract: Organization of the fibre connections in the chick nucleus rotundus (Rt) was investigated by an axonal tracing method using wheat germ agglutinin conjugated to horseradish peroxidase (WGA-HRP). After an injection of WGA-HRP into the Rt, labelled neurones were observed in the striatum griseum centrale (SGC) in both sides of the tectum (TO) and in the ipsilateral nucleus subpretectalis/nucleus interstito-pretecto-subpretectalis (SP/IPS). Labelled fibres and terminals were also found in the ipsilateral ectostriatum (Ect). These fibre connections were topographically organized rostrocaudally. In the TO-Rt projection, the rostral and the dorsocaudal parts of the Rt received afferents from the superficial part of the SGC, the middle part of the Rt received afferents from the intermediate part of the SGC, and the ventrocaudal part of the Rt received mainly fibres from the deep part of the SGC. These topographic projections were accompanied by a considerable number of diffuse projections to the thalamic regions surrounding the Rt. In addition, the rostral and middle caudal parts of the Rt received afferents from the lateral and medial parts of the SP/IPS, respectively, and respective parts of the Rt sent efferents to the lateral and medial parts of the Ect.
authors.affiliation: Division of Biofunctions Development, Graduate School of Bioagricultural Sciences, Nagoya University, Chikusa-Ku, Nagoya 464-8601, Japan.
authors.forename: M
authors.initials: M
authors.lastname: Hu
authors.forename: J
authors.initials: J
authors.lastname: Naito
authors.forename: Y
authors.initials: Y
authors.lastname: Chen
authors.forename: Y
authors.initials: Y
authors.lastname: Ohmori
authors.forename: K
authors.initials: K
authors.lastname: Fukuta
mesh_terms: D000344:Afferent Pathways / Q000033:anatomy & histology / Q000502:physiology; D000818:Animals; D001931:Brain Mapping / Q000379:methods; D002645:Chickens / Q000033:anatomy & histology* / Q000502:physiology; D004525:Efferent Pathways / Q000033:anatomy & histology / Q000502:physiology; D007267:Injections / Q000662:veterinary; D007478:Iontophoresis / Q000662:veterinary; D015335:Molecular Probes / Q000008:administration & dosage; D013477:Superior Colliculi / Q000033:anatomy & histology* / Q000502:physiology; D014795:Visual Pathways / Q000033:anatomy & histology* / Q000502:physiology; D018998:Wheat Germ Agglutinin-Horseradish Peroxidase Conjugate / Q000008:administration & dosage
chemical_list: D015335:Molecular Probes; D018998:Wheat Germ Agglutinin-Horseradish Peroxidase Conjugate