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Topic: Tectum

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	cyclops-hrp.html
		To guarantee the removal of the tectum, the entire cerebral aqueduct was exposed.
		In contrast to the latter, HRP was found on left and right sides of the tectum among both albino and pigmented cyclopes and orthoclopes.
		Thus, while a connection between the retina and the tectum appears to be a necessary condition for NP, based upon the tectectomy series, additional conditions must be satisfied for the animal to display NP behavior.
	www.indiana.edu /~pietsch/cyclops-hrp.html (4476 words)

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	Early auditory experience aligns the auditory map of space in the optic tectum of the barn owl -- Knudsen 222 (4626): ...
		Early auditory experience aligns the auditory map of space in the optic tectum of the barn owl
		Auditory and visual space are mapped in the optic tectum of the barn owl.
		These results demonstrate that the neural connectivity that gives rise to the auditory map of space in the optic tectum can be modified by experience in such a way that spatial alignment between sensory modalities is maintained.
	www.sciencemag.org /cgi/content/abstract/222/4626/939 (398 words)

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	www.aecdaily.com /en/185449 (594 words)

	Postembryonic growth of the optic tectum in goldfish. II. Modulation of cell proliferation by retinal fiber input. (Site not responding. Last check: 2007-10-25)
		Temporary denervation (by optic nerve crush) initially had a similar effect; however, upon reinnervation of the tectum by regenerating optic fibers, proliferation was enhanced on the experimental side compared to the intact side.
		We conclude that cytogenesis in the germinal zone of the growing optic tectum of adult goldfish is regulated by optic fiber input.
		This mechanism may be important in matching the rates of growth of retina and tectum in the normal brain of the growing adult fish.
	www.arclab.org /medlineupdates/abstract_6842283.html (350 words)

	Adaptive Adjustment of Connectivity in the Inferior Colliculus Revealed by Focal Pharmacological Inactivation -- Gold ...
		inactivation on responses in the tectum and not the ICX because
		Units in the optic tectum are tuned for ITD but, unlike units in the ICC, are broadly tuned for frequency.
		Summary of the effect of lidocaine injection in the lateral shell of the ICC on auditory responses in the optic tectum of normal (gray symbols) and device-reared (fl symbols) owls.
	jn.physiology.org /cgi/content/full/85/4/1575 (7087 words)

	Inductive signal and tissue responsiveness defining the tectum and the cerebellum -- Sato et al. 128 (13): 2461 -- ...
		In A-C the anterior limit of the tectum is indicated by white arrowheads and a fl arrow (in B) on the control side, and by fl arrowheads on the experimental side.
		substitution of the tectum with the cerebellum (4/4, Fig.
		and that the tectum was induced surrounding the cerebellar islet.
	dev.biologists.org /cgi/content/full/128/13/2461 (5645 words)

	TECTUM publishers (Site not responding. Last check: 2007-10-25)
		Tectum Publishers is an Antwerp-based publishing company specializing in beautifully illustrated, trilingual coffee table books.
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	Tucker, Mol Vis 1998; 4:18.
		The purpose of this study was to use quantitative in situ hybridization to determine the relative abundance of transcripts encoding the alternatively spliced fibronectin type III repeats of tenascin-C in the embryonic avian optic tectum.
		A representative collection of cross sections through the E10 quail optic tectum hybridized with the probes to tenascin-C variable repeats is illustrated in Figure 2.
		The radial glia of the optic tectum similarly support the migration of neuronal precursors from the ventricular zone to their appropriate layer from E4 till E12 [20], and radial glia-derived tenascin-C may provide an environment that is conducive to motility.
	www.molvis.org /molvis/v4/a18 (2065 words)

	Edward R. Gruberg
		Since the tectum is not necessary to detect apertures we are looking for the neural substrate underlying the ability to detect stationary objects.
		The optic tectum is the principal target of the retina.
		Using three different fluorescent retrograde labels we have been studying the anatomical arrangement of medullary cells of nucleus isthmi that project to ipsilateral tectum and the medullary cells that project to contralateral tectum.
	www.temple.edu /biology/faculty/gruberg.html (1044 words)

	tectum
		Postembryonic growth of the optic tectum in goldfish.
		Neurotrophin receptor TrkB activation is not required for the postnatal survival of retinal ganglion cells in vivo.
		Sensitive periods for visual calibration of the auditory space map in the barn owl optic tectum.
	www.arclab.org /node_pages/91.html (363 words)

	Physiology (Site not responding. Last check: 2007-10-25)
		There is greater magnification of the infrared map relative to the visual map, and there are differences in axis alignment between the infrared and visual maps.
		Bimodal neurons found in the tectum do not appear to correct for the disparity in the maps, but systematic, locus-specific displacements of infrared receptive fields relative to visual fields of bimodal cells suggest that bimodal cell inputs are spatially similar to nearby unimodal visual and infrared neurons (Hartline et al 1978).
		The optic tectum contains unimodal cells that respond to either visual or infrared stimuli and bimodal cells that respond to some combination of the two.
	instruct1.cit.cornell.edu /courses/bionb424/students2004/bjp27/physiology.htm (777 words)

	School of Medicine Faculty Web Pages
		The relay for visual input from each eye to the ipsilateral tectum, is a tegmental structure called the nucleus isthmi.
		The axons from this structure are guided to the optic tectum by unknown non-visual processes, but within the tectum, their final connections are completely dependent on the visual input coming from the 2 eyes.
		Rybicka KK, Susan Udin; Ultrastructure and GABA immunoreactivity in layers 8 and 9 of the optic tectum of Xenopus laevis.
	deptdirectory.med.buffalo.edu /profile/facultyprofile.asp?ht=dd&fid=0F70L4CXB (1184 words)

	Gradients and Mapping
		In the retinotectal topographic map, axons project from the temporal retina to the anterior tectum, and from the nasal retina to the posterior tectum.
		However, the amount of repulsion of nasal axons in the anterior tectum is lower than the attractive forces, and the growth cone continues migration towards the posterior tectum: middle axon in the diagram.
		However, many axons project to the normal location in the tectum, and the entire length of tectum is occupied by retinal axons, even in the double ephrin mutant.
	biology.queensu.ca /~chinsang/slide_3.htm (295 words)

	CJO - Abstract
		Although the precise cellular mechanisms are unclear, the ability to regenerate CNS neurons and connections that subsequently sustain visual behavior is remarkable, especially for an adult vertebrate.
		However, 9–18 weeks after ouabain injection, metabolic activity in the deprived tectum recovered to a level that was statistically indistinguishable from normal controls (N = 6).
		These findings suggest that, after a comprehensive cytotoxic lesion of the retina, regenerated ganglion cells not only establish new connections with the preexisting optic tectum, but also effectively transmit visual information they receive from newly generated photoreceptors to the “old” tectum.
	journals.cambridge.org /production/action/cjoGetFulltext?fulltextid=93055 (298 words)

	ON and OFF Channels of the Frog Optic Tectum Revealed by Current Source Density Analysis -- Nakagawa and Matsumoto 80 ...
		We have shown in the frog tectum that CSD analysis is a very powerful tool to analyze not only visual input pathways but also
		Twenty-four penetrations were made in the optic tectum in 16 frogs.
		How retinal and pretectal inputs to the toad's superficial tectum interact: a study of electrically evoked field potentials.
	jn.physiology.org /cgi/content/full/80/4/1886 (7972 words)

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	www.tectum-verlag.de (218 words)

	DEVELOPMENT: ON THE GUIDANCE OF RETINAL NEURONS (Site not responding. Last check: 2007-10-25)
		RGC nerve fibers (axons) project into the brain in an orderly manner along both the x and y axes, such that the two-dimensional image is recapitulated in the optic tectum region of the brain.
		To limit the number of different tags needed to specify the connections, Sperry further proposed that the chemicals on RGC axons and in the tectum form gradients, such that the amounts of a tag could specify different positions.
		If they were, all RGC axons would head for the medial-most tectum, which is most attractive, and leave the lateral tectum unoccupied.
	scienceweek.com /2006/sw060210-4.htm (1631 words)

	Postembryonic growth of the optic tectum in goldfish. II. Modulation of cell proliferation by retinal fiber input -- ...
		Postembryonic growth of the optic tectum in goldfish.
		The proliferation of cells in the germinal zone of the optic tectum of
		the denervated tectum than in the intact tectum.
	www.jneurosci.org /cgi/content/abstract/3/5/1092 (327 words)

	Visuomotor Behaviors in Larval Zebrafish after GFP-Guided Laser Ablation of the Optic Tectum -- Roeser and Baier 23 ...
		The optic tectum is the largest visual center in most vertebrates and the main target for retinal ganglion cells (RGCs) conveying
		Tectum ablation, however, slowed down the OKR by reducing
		both OKR and OMR, suggesting that the tectum is not an integral
	www.jneurosci.org /cgi/content/short/23/9/3726 (480 words)

	Control of chick tectum territory along dorsoventral axis by Sonic hedgehog -- Watanabe and Nakamura 127 (5): 1131 -- ...
		tectum, while the basal plate gives rise to the tegmentum.
		crucial for tectum formation was strongly suppressed in the midbrain and
		massive cell proliferation that normally occurs in the developing tectum.
	dev.biologists.org /cgi/content/abstract/127/5/1131 (562 words)

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	TECTUM Articles The tectum (Latin: roof) is the dor (Site not responding. Last check: 2007-10-25)
		TECTUM Articles The tectum (Latin: roof) is the dor
		The term "tectal plate" (or "quadrigeminal plate") is used to describe the junction of the gray and white matter in the embryo.
		Showing 1 to 0 of 0 Articles matching 'Tectum' in related articles.
	www.amazines.com /Tectum_related.html (377 words)

	The effect of GABA on the frog optic tectum is sensitive to ammonium and to penicillin. (Site not responding. Last check: 2007-10-25)
		The effect of GABA on the frog optic tectum is sensitive to ammonium and to penicillin.
		Penicillin, a Cl- channel blocker, antagonized the action of GABA and glycine, while increasing the amplitude of the U2 waveform.
		The present results provide pharmacological evidence in support of the Cl- dependence of the unusual action of GABA or glycine in facilitating excitatory synaptic transmission in the optic tectum.
	www.ionchannels.org /showabstract.php?pmid=2163848 (306 words)

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