Several neuronal and axonal types form long intrinsic connections in the cat primary auditory cortical field (AI).

Détails

ID Serval
serval:BIB_5788C5BC2234
Type
Article: article d'un périodique ou d'un magazine.
Collection
Publications
Institution
Titre
Several neuronal and axonal types form long intrinsic connections in the cat primary auditory cortical field (AI).
Périodique
Anatomy and Embryology
Auteur(s)
Clarke S., de Ribaupierre F., Rouiller E.M., de Ribaupierre Y.
ISSN
0340-2061 (Print)
ISSN-L
0340-2061
Statut éditorial
Publié
Date de publication
1993
Volume
188
Numéro
2
Pages
117-138
Langue
anglais
Notes
Publication types: Journal Article ; Research Support, Non-U.S. Gov't
Publication Status: ppublish
Résumé
Intrinsic connections in the cat primary auditory field (AI) as revealed by injections of Phaseolus vulgaris leucoagglutinin (PHA-L) or biocytin, had an anisotropic and patchy distribution. Neurons, labelled retrogradely with PHA-L were concentrated along a dorsoventral stripe through the injection site and rostral to it; the spread of rostrally located neurons was greater after injections into regions of low rather than high characteristic frequencies. The intensity of retrograde labelling varied from weak and granular to very strong and Golgi-like. Out of 313 Golgi like retrogradely labelled neurons 79.6% were pyramidal, 17.2% multipolar, 2.6% bipolar, and 0.6% bitufted; 13.4% were putatively inhibitory, i.e. aspiny or sparsely spiny multipolar, or bitufted. Individual anterogradely labelled intrinsic axons were reconstructed for distances of 2 to 7 mm. Five main types were distinguished on the basis of the branching pattern and the location of synaptic specialisations. Type 1 axons travelled horizontally within layers II to VI and sent collaterals at regular intervals; boutons were only present in the terminal arborizations of these collaterals. Type 2 axons also travelled horizontally within layers II to VI and had rather short and thin collateral branches; boutons or spine-like protrusions occurred in most parts of the axon. Type 3 axons travelled obliquely through the cortex and formed a single terminal arborization, the only site where boutons were found. Type 4 axons travelled for some distance in layer I; they formed a heterogeneous group as to their collaterals and synaptic specializations. Type 5 axons travelled at the interface between layer VI and the white matter; boutons en passant, spine-like protrusions, and thin short branches with boutons en passant were frequent all along their trajectory. Thus, only some axonal types sustain the patchy pattern of intrinsic connectivity, whereas others are involved in a more diffuse connectivity.
Mots-clé
Animals, Auditory Cortex/cytology, Auditory Cortex/ultrastructure, Axons/ultrastructure, Cats/anatomy & histology, Cell Communication, Lysine/analogs & derivatives, Neurons/ultrastructure, Phytohemagglutinins
Pubmed
Web of science
Création de la notice
26/01/2009 7:48
Dernière modification de la notice
20/08/2019 14:11
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