tectum


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Related to tectum: Optic tectum

tectum

[′tek·təm]
(anatomy)
A rooflike structure of the body, especially the roof of the midbrain including the corpora quadrigemina.
References in periodicals archive ?
Desv are tricolpate, prolate, tectum was reticulate (Mousavi and Sharifi-Rad, 2014).
In the goldfish visual system, the optic tectum has a topographical map, (36) and the midbrain (mesencephalic reticular) and the optic tectum have reciprocal circuits that regulate eye movements.
Pollen type was defined according the classification proposed by Praglowski (1974) based on tectum surface and grain size: large pollen grains, 45 [micro]m or larger, smooth tectum surface (Type 1); small pollen grains, <45 [micro]m, smooth tectum surface (Type 2); large pollen grains, sculpture slightly rugulate (Type 3); small pollen grains, sculpture slightly rugulate (Type 4), sculpture coarsely rugulate (Type 5); pollen grains semitectate, exine structure microreticulate, large (Type 6) and pollen grains semitectate, exine structure microreticulate, small (Type 7).
Parameres large, fused dorsally, clearly dentate on ventral margin, lateral border carinate; tectum large, uniformly convex; sclerotized support of aedeagus curved downward and widely bifurcate apically (Figs.
In the occipital region, the otic capsule presents the fenestra ovalis, and the tectum synoticum exhibits the ascending process.
The exine wall of the microspores is formed by a basal layer, numerous columellae close to each other, and a thick tectum (Fig.
Las observaciones de la microestructura al MEB muestran que la superficie de los granos de polen tiene espinas y un tectum perforado irregularmente (Fig.
Belgium-based Tectum Group made its first appearance in the Middle East by showcasing its specialist roofing solutions at this year's Big 5 exhibition in Dubai.
In post- contrast series, band or nodular hyperintensities were seen due to contrast enhancement at the hypothalamic area, pituitary stalk, periaqueductal region and tectum (Figure-1-3).
Exina total 1,52 [micron]m; nexina 0,49 [micron]m; sexina 1,03 [micron]m, tectada, superficie psilada con punctas que no atraviesan todo el tectum (2-G, H, I y 3-F, G).
It appears that different directions of motion are processed in different layers of the tectum, since the dendritic ramifications of these cell types are spatially separated from each other," said Bollmann.
Light-near dissociation can be caused by severe loss of afferent light input to both eyes, caused by damage to the retina or optic nerve pathways, or samage at the tectum of the midbrain, causing loss of pretectal light input to the Edinger-Westphal nucleus (part of the parasympathetic chain of pupillary innervation).