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Titolo:
THE ULTRASTRUCTURE OF THE OLIVARY PRETECTAL NUCLEUS IN RATS - A TRACING AND GABA IMMUNOHISTOCHEMICAL STUDY
Autore:
KLOOSTER J; VRENSEN GFJM;
Indirizzi:
NETHERLANDS OPHTHALM RES INST,DEPT MORPHOL,POB 12141 NL-1100 AC AMSTERDAM NETHERLANDS
Titolo Testata:
Experimental Brain Research
fascicolo: 1, volume: 114, anno: 1997,
pagine: 51 - 62
SICI:
0014-4819(1997)114:1<51:TUOTOP>2.0.ZU;2-1
Fonte:
ISI
Lingua:
ENG
Soggetto:
PUPILLARY LIGHT REFLEX; LATERAL GENICULATE-NUCLEUS; MEDIAL TERMINAL NUCLEUS; OPTIC TRACT; SUPERIOR COLLICULUS; SYNAPTIC ORGANIZATION; GABAERGIC NEURONS; CORTICAL INPUT; RABBIT; PROJECTIONS;
Keywords:
PUPILLARY LIGHT REFLEX; PRETECTUM; ANTEROGRADE AND RETROGRADE TRACING; GABA IMMUNOHISTOCHEMISTRY; RAT;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
44
Recensione:
Indirizzi per estratti:
Citazione:
J. Klooster e G.F.J.M. Vrensen, "THE ULTRASTRUCTURE OF THE OLIVARY PRETECTAL NUCLEUS IN RATS - A TRACING AND GABA IMMUNOHISTOCHEMICAL STUDY", Experimental Brain Research, 114(1), 1997, pp. 51-62

Abstract

The olivary pretectal nucleus is a primary visual centre, involved inthe pupillary light reflex. In the present study an ultrastructural analysis was made of the olivary pretectal nucleus by means of separate, anterograde and retrograde tracing techniques and immunohistochemistry of gamma-aminobutyric acid. Large-projection neurons and two types of gamma-aminobutyric acid-immunoreactive (GABA-ir) neurons are observed in the olivary pretectal nucleus. The primary dendrites of the projection neurons have a dichotomous appearance, the secondary dendrites a multipolar appearance. At the ultrastructural level the projection neurons have well-developed Golgi fields, abundant rough endoplasmic reticulum and the nucleus is always heavily indented. Numerous small GABA-ir neurons and a few medium-sized GABA-ir neurons are found. The small GABA-ir neurons contain a few stacks of rough endoplasmic reticulumand the nucleus is oval-shaped. The medium-sized GABA-ir neurons havewell-developed Golgi fields, a moderate number of rough endoplasmic reticulum stacks and an indented nucleus. GABA-positive dendritic profiles containing vesicles also are observed. In the neuropil of the olivary prerectal nucleus, retinal terminals are found that contain round clear vesicles and electron-lucent mitochondria. They make asymmetric synaptic contacts (Gray type I) with dendritic profiles and with profiles containing vesicles. Terminals originating from the contralateral olivary prerectal nucleus exhibit small, round clear vesicles, electron-dense mitochondria and make asymmetric synaptic contacts (Gray type I) mainly with dendritic profiles. Two types of GABA-ir terminals werefound. One type is incorporated in glomerulus-like arrangements, whereas the other type is not. GABA-ir terminals contain pleomorphic vesicles, electron-dense mitochondria and make symmetric synaptic contacts (Gray type II). Retinal terminals, terminals originating from the contralateral olivary prerectal nucleus and GABA-ir terminals are organized in glomerulus-like structures, in which dendrites of the large projection neurons form the central elements. Triadic arrangements are observed in these structures; a retinal terminal contacts a dendrite and aGABA-ir terminal and the GABA-ir terminal also contacts the dendrite. The complexity of the synaptic organization and the abundancy of inhibitory elements in the olivary pretectal nucleus suggest that the olivary pretectal nucleus is strongly involved in processing visual information in the pupillary light reflex are.

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Documento generato il 31/03/20 alle ore 19:42:16