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Abstract:

The morphology and fine structure of the ocelli of Triatoma infestans have been analyzed by means of light and electron microscopy. The two dorsal ocelli of this species are located behind the compound eyes, looking dorsally and frontally. Externally, the ocelli are marked by the corneal lenses virtually spherical in form and limited internally by a cuticular apodeme. The lens focuses the incoming rays beyond the retina. A single layer of corneagen cells lies below the cuticular lens. The corneagen cells and photoreceptors are arranged in a cup-like fashion beneath the cuticular lens. A distal retinal zone comprises the rhabdoms, which are laterally connected in an hexagonal meshwork. A middle retinal zone comprises the receptor cell segment free of rhabdom, and a proximal zone their axons. In the middle zone, the oviform nuclei and spheroids are located. Screening pigment granules are present within the retinal cell. Spherical mitochondria are homogeneously distributed in the cytoplasm of the cell body. In the axonal zone, mitochondria are found in the peripheral region. Axons from receptor cells extend into the ocellar neuropile at the base of the ocelli, to synapse with second order neurons. The large axons of second order neurons are bundled by glial cells. The ocellar plexus exhibits a high diversity of synaptic unions (i.e. axo-dendritic, axo-axonic, dendro-axonic, and dendro-dendritic). © 2002 Elsevier Science Ltd. All rights reserved.

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Documento: Artículo
Título:The fine structure of the ocelli of Triatoma infestans (Hemiptera: Reduviidae)
Autor:Insausti, T.C.; Lazzari, C.R.
Filiación:Depto. de Biodivers. y Biol. Exp., Facultad de Cs Exactas y Naturales, Universidad de Buenos Aires, C1428EHA Buenos Aires, Argentina
Palabras clave:Insect; Ocelli; Triatoma infestans; Triatominae; Ultrastructure; Vision; article; cell nucleus; cell screening; cornea; cornea cell; cytoplasm; electron microscopy; eye; glia cell; Hemiptera; insect; lens; male; mitochondrion; morphology; nerve cell; nerve fiber; neuropil; nonhuman; ocelli; photoreceptor; Reduviidae; retina; retina cell; spheroid cell; synapse; tendon; Triatoma infestans; Triatominae; ultrastructure; vision; Hemiptera; Insecta; Reduviidae; Triatoma; Triatoma infestans; Triatominae
Año:2002
Volumen:34
Número:6
Página de inicio:437
Página de fin:449
DOI: http://dx.doi.org/10.1016/S0040816602000848
Título revista:Tissue and Cell
Título revista abreviado:Tissue Cell
ISSN:00408166
CODEN:TICEB
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00408166_v34_n6_p437_Insausti

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Citas:

---------- APA ----------
Insausti, T.C. & Lazzari, C.R. (2002) . The fine structure of the ocelli of Triatoma infestans (Hemiptera: Reduviidae). Tissue and Cell, 34(6), 437-449.
http://dx.doi.org/10.1016/S0040816602000848
---------- CHICAGO ----------
Insausti, T.C., Lazzari, C.R. "The fine structure of the ocelli of Triatoma infestans (Hemiptera: Reduviidae)" . Tissue and Cell 34, no. 6 (2002) : 437-449.
http://dx.doi.org/10.1016/S0040816602000848
---------- MLA ----------
Insausti, T.C., Lazzari, C.R. "The fine structure of the ocelli of Triatoma infestans (Hemiptera: Reduviidae)" . Tissue and Cell, vol. 34, no. 6, 2002, pp. 437-449.
http://dx.doi.org/10.1016/S0040816602000848
---------- VANCOUVER ----------
Insausti, T.C., Lazzari, C.R. The fine structure of the ocelli of Triatoma infestans (Hemiptera: Reduviidae). Tissue Cell. 2002;34(6):437-449.
http://dx.doi.org/10.1016/S0040816602000848