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Titolo:
7 RETINAL SPECIALIZATIONS IN THE TUBULAR EYE OF THE DEEP-SEA PEARLEYE, SCOPELARCHUS-MICHAELSARSI - A CASE-STUDY IN VISUAL OPTIMIZATION
Autore:
COLLIN SP; HOSKINS RV; PARTRIDGE JC;
Indirizzi:
UNIV WESTERN AUSTRALIA,DEPT ZOOL,MARINE NEUROBIOL LAB NEDLANDS WA 6907 AUSTRALIA UNIV BRISTOL,SCH BIOL SCI BRISTOL AVON ENGLAND
Titolo Testata:
Brain, behavior and evolution
fascicolo: 6, volume: 51, anno: 1998,
pagine: 291 - 314
SICI:
0006-8977(1998)51:6<291:7RSITT>2.0.ZU;2-V
Fonte:
ISI
Lingua:
ENG
Soggetto:
GANGLION-CELL TOPOGRAPHY; QUANTITATIVE-ANALYSIS; ALPHA-GANGLION; REEF TELEOSTS; PIGMENTED RABBIT; CAT RETINA; DENSITY; MORPHOLOGY; MOSAICS; STREAKS;
Keywords:
FISH; RETINA; RETINAL GANGLION CELLS; TOPOGRAPHY; RODS; CONES; OPTIC NERVE; AREA CENTRALIS;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Science Citation Index Expanded
Citazioni:
70
Recensione:
Indirizzi per estratti:
Citazione:
S.P. Collin et al., "7 RETINAL SPECIALIZATIONS IN THE TUBULAR EYE OF THE DEEP-SEA PEARLEYE, SCOPELARCHUS-MICHAELSARSI - A CASE-STUDY IN VISUAL OPTIMIZATION", Brain, behavior and evolution, 51(6), 1998, pp. 291-314

Abstract

The deep-sea pearleye, Scopelarchus michaelsarsi (Scopelarchidae) is a mesopelagic teleost with asymmetric or tubular eyes. The main retinasubtends a large dorsal binocular field, while the accessory retina subtends a restricted monocular field of lateral visual space. Ocular specializations to increase the lateral visual field include an obliquepupil and a corneal lens pad. A detailed morphological and topographic study of the photoreceptors and retinal ganglion cells reveals sevenspecializations: a centronasal region of the main retina with ungrouped rod-like photoreceptors overlying a retinal tapetum; a region of high ganglion cell density (area centralis of 56.1x10(3) cells per mm(2)) in the centrolateral region of the main retina; a centrotemporal region of the main retina with grouped rod-like photoreceptors; a region (area giganto cellularis) of large (32.2+/-5.6 mu m(2)), alpha-like ganglion cells arranged in a regular array (nearest neighbour distance 53.5+/-9.3 mu m with a conformity ratio of 5.8) in the temporal main retina; an accessory retina with grouped rod-like photoreceptors; a nasotemporal band of a mixture of rod-and cone-like photoreceptors restricted to the ventral accessory retina; and a retinal diverticulum comprised of a ventral region of differentiated accessory retina located medial to the optic nerve head. Retrograde labelling from the optic nervewith DiI shows that approximately 14% of the cells in the ganglion cell layer of the main retina are displaced amacrine cells at 1.5 mm eccentricity. Cryosectioning of the tubular eye confirms Matthiessen's ratio (2.59), and calculations of the spatial resolving power suggests that the function of the area centralis (7.4 cycles per degree/8.1 minutes of are) and the cohort of temporal alpha-like ganglion cells (0.85cycles per degree/70.6 minutes of are) in the main retina may be different. Low summation ratios in these various retinal zones suggests that each zone may mediate distinct visual tasks in a certain region of the visual field by optimizing sensitivity and/or resolving power.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 25/09/20 alle ore 00:08:06