Document Detail


Light and electron microscopic evidence for projections from the thalamic nucleus rotundus to targets in the basal ganglia, the dorsal ventricular ridge, and the amygdaloid complex in a lizard.
MedLine Citation:
PMID:  10906699     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
To elucidate the organization and evolution of the tectorotundotelencephalic pathways in birds and reptiles, we reinvestigated at both light and electron microscopic levels the efferent projections of nucleus rotundus in a lizard, using the sensitive tracer biotinylated dextran amine. Our results indicate that nucleus rotundus projects to targets in the basal ganglia (lateral parts of striatum and olfactory tubercle and possibly the globus pallidus), the anterior dorsal ventricular ridge (ADVR), and the amygdaloid complex (the central and possibly lateral amygdaloid nuclei). In these targets, the rotundal axon terminals establish asymmetric, presumably excitatory synaptic contacts, usually with dendrites of local cells. In the ADVR, the rotundal projection terminates in two separate radial regions showing distinct cytoarchitecture: 1) a dorsolateral region that extends radially from the dorsolateral ADVR ventricular surface to the ventral part of the lateral cortex and 2) the lateral part of a ventromedial region that extends radially from the dorsomedial and medial ADVR ventricle to a superficial area interposed between the dorsolateral ADVR and the striatum. These two ADVR regions have different connections with the thalamus and telencephalon, which suggests that they may be involved in different degrees of integration. Our study also suggests that the rotundal projection to the ventromedial ADVR field of lizards may be comparable to the rotundoectostriatal/periectostriatal projection of birds. The connections and pathways involving nucleus rotundus suggest that this nucleus conveys visual information which may play a role in visuomotor, emotional, and visceral functions.
Authors:
S Guirado; J C Dávila; M A Real; L Medina
Related Documents :
21980529 - Nogo-a expression in the brain of mice with cerebral malaria.
3036299 - Cerebellar corticonuclear and corticovestibular fibers from the posterior lobe of the a...
6153919 - An analysis of the efferent connections of the septal area in the cat.
8557849 - Ascending projections of the posterior nucleus of the hypothalamus: pha-l analysis in t...
1381829 - Morphological evidence for a substance p projection from medial septum to hippocampus.
1702109 - Two transpallidal pathways originating in the rat nucleus accumbens.
23232799 - Influence of body temperature on the evoked activity in mouse visual cortex.
2088749 - Effects of lead on neurophysiological and performance measures: animal and human data.
22326949 - Towards multifocal ultrasonic neural stimulation ii: design considerations for an acous...
Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  The Journal of comparative neurology     Volume:  424     ISSN:  0021-9967     ISO Abbreviation:  J. Comp. Neurol.     Publication Date:  2000 Aug 
Date Detail:
Created Date:  2000-09-07     Completed Date:  2000-09-07     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  0406041     Medline TA:  J Comp Neurol     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  216-32     Citation Subset:  IM    
Copyright Information:
Copyright 2000 Wiley-Liss, Inc.
Affiliation:
Departamento de Biología Celular y Genética, Facultad de Ciencias, Universidad de Málaga, Málaga 29071, Spain. guirado@uma.es
Export Citation:
APA/MLA Format     Download EndNote     Download BibTex
MeSH Terms
Descriptor/Qualifier:
Amygdala / physiology,  ultrastructure*
Animals
Axons / physiology,  ultrastructure
Basal Ganglia / physiology,  ultrastructure*
Emotions / physiology
Lizards / anatomy & histology*,  physiology
Microscopy, Electron
Neural Pathways / physiology,  ultrastructure*
Psychomotor Performance / physiology
Synapses / physiology,  ultrastructure
Thalamus / cytology*,  physiology

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


Previous Document:  Taste cells with synapses in rat circumvallate papillae display SNAP-25-like immunoreactivity.
Next Document:  Monosynaptic projections from the nucleus retroambiguus to motoneurons supplying the abdominal wall,...