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Titolo:
PROJECTION FROM THE ACCOMMODATION-RELATED AREA IN THE SUPERIOR COLLICULUS OF THE CAT
Autore:
SATO A; OHTSUKA K;
Indirizzi:
SAPPORO MED UNIV,SCH MED,DEPT OPHTHALMOL,CHUO KU,S-1,W-16 SAPPORO HOKKAIDO 060 JAPAN SAPPORO MED UNIV,SCH MED,DEPT OPHTHALMOL,CHUO KU SAPPORO HOKKAIDO 060JAPAN
Titolo Testata:
Journal of comparative neurology
fascicolo: 3, volume: 367, anno: 1996,
pagine: 465 - 476
SICI:
0021-9967(1996)367:3<465:PFTAAI>2.0.ZU;2-Y
Fonte:
ISI
Lingua:
ENG
Soggetto:
PUPILLARY LIGHT REFLEX; RETROGRADE AXONAL-TRANSPORT; PARIETAL ASSOCIATION CORTEX; PONTINE RETICULAR-FORMATION; SACCADIC EYE-MOVEMENTS; ORIENTING GAZE SHIFTS; HEAD-FREE CAT; HORSERADISH-PEROXIDASE; LENS ACCOMMODATION; EFFERENT CONNECTIONS;
Keywords:
BIOCYTIN STUDY; PRETECTUM; OCULAR NEAR RESPONSE; VERGENCE; FIXATION;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
72
Recensione:
Indirizzi per estratti:
Citazione:
A. Sato e K. Ohtsuka, "PROJECTION FROM THE ACCOMMODATION-RELATED AREA IN THE SUPERIOR COLLICULUS OF THE CAT", Journal of comparative neurology, 367(3), 1996, pp. 465-476

Abstract

Our previous study has indicated that accommodative responses can be evoked with weak currents applied to a circumscribed area of the superior colliculus in the cat. We investigated efferent projections from this area with biocytin in the present study. The accommodation area inthe superior colliculus was identified by systematic microstimulationin each of five anesthetized cats. Accommodative responses were detected by an infrared optometer. After mapping the superior colliculus, biocytin was injected through a glass micropipette into the accommodation area, where accommodative responses were elicited with low-intensity microstimulation. In addition, accommodative responses to stimulation of the superior colliculus were compared before and after an injection of muscimol, an agonist of inhibitory neurotransmitter, into the pretectum. Following the injection of biocytin, in the ascending projections, labeled terminals were seen mainly in the caudal portion of the nucleus of the optic tract, the nucleus of the posterior commissure, the posterior pretectal nucleus, the olivary pretectal nucleus, the mesencephalic reticular formation at the level of the oculomotor nucleus,and the lateral posterior nucleus of the thalamus on the ipsilateral side. Less dense terminals were seen in the anterior pretectal nucleus, the zona incerta, and the centromedian nucleus of the thalamus. In the descending projections, labeled terminals were observed mainly in the paramedian pontine reticular formation, the nucleus raphe interpositus, and the dorsomedial portion of the nucleus reticularis tegmenti pontis on the contralateral side. Less dense terminals were also seen in the nucleus of the brachium of the inferior colliculus, the cuneiform nucleus, the medial part of the paralemniscal tegmental field, and the dorsolateral division of the pontine nuclei on the ipsilateral side. Following the injection of muscimol into the pretectum, including the nucleus of the optic tract, the posterior pretectal nucleus, and thenucleus of the posterior commissure, accommodative responses evoked by microstimulation of the superior colliculus were reduced to 33-55% of the value before the injections. These findings suggest that the accommodation area in the superior colliculus projects to the oculomotor nucleus through the ipsilateral pretectal area, especially the nucleusof the optic tract, the nucleus of posterior commissure, and the posterior pretectal nucleus, and also projects to the pupilloconstriction area (the olivary pretectal nucleus), the vergence-related area (the mesencephalic reticular formation), and the active visual fixation-related area (the nucleus raphe interpositus). (C) 1996 Wiley-Liss, Inc.

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Documento generato il 06/04/20 alle ore 01:42:32