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 ?
However, the tectum is continuous, as in most Piperales, and a thick nexine occurs in Saururaceae as well as Chloranthaceae (Doyle & Hotton, 1991; Smith & Stockey, 2007).
Brain structures that displayed reactivity to the Arc antibody included the brain stem (LX; Figure 1), the internal cellular layer (ICL) of the olfactory bulb (Figure 1B), the dorsal and ventral regions of the telencephalon (Figure 1B), the periventricular granular zone (PGZ; Figure 1D), the optic tectum (TeO; Figure 1D), the hypothalamus and associated mammillary bodies (Figure 1E), the habenula (Ha; Figure 1F), the periventricular pretectal nucleus (PPv; Figure 1G), and the cerebellum (Figure 1H).
The optic tectum receives visual inputs from the retina and sends motor output to the hind-brain.
They continue to extend dorsally and posteriorly to the tectum. In contrast to binocular animals, all retinal axons cross the midline and project to the contralateral brain in zebrafish.
curcas (Non-toxic) Morphological Cultivated (IND) * Cultivated (SIN) ** characteristics Clavae Number 84 [+ or -] 10 (a) 108 [+ or -] 15 (b) Shape Spheroidal Diameter ([micro]m) 58 [+ or -] 2.3 (c) 54 [+ or -] 1.7 (d) Endexine Reticulated Ectexine Intectate (no tectum) Clava In Gemma of 2 x 2 [micro]m Striation Visible Slightly visible Bacules Present Present Species J.
Indeed, reinnervation of the optic tectum was found to be significantly increased in the zymosantreated group, indicating that inflammatory stimulation accelerated the regenerative response after optic nerve injury in zebrafish (Figure 2).
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.
Three different electron- dense layers form the pollen grain wall: ectexine with interrupted tectum, columellae and foot layer; endexine and intine still in formation.
Las observaciones de la microestructura al MEB muestran que la superficie de los granos de polen tiene espinas y un tectum perforado irregularmente (Fig.