tectal

The parabigeminal nucleus plays a very important role in tectal function that will be described below.

The contribution of the thalamus to vestibular or to tectal functions is almost ignored.

The general function of the tectal system is to direct behavioral responses toward specific points in egocentric ("body-centered") space.

Here, the apparent lack of the spatial rule, further differentiates cortical and tectal multisensory neurons.

Focal, tectal, and exophytic cervicomedullary tumors are generally low-grade tumors.

Some subcortical afferences are documented in macaques (amygdalar, tectal).

For example, in optical tectal neurons, dendrite arbor growth occurs approximately at the onset of retinal input.

The term "tectal plate" (or "quadrigeminal plate") is used to describe the junction of the gray and white matter in the embryo.

VImM receives mainly "associative" information from the dentate, plus tectal and spinothalamic information.

In addition to nigral, VA receives amygdalar and tectal (superior colliculus)axons.

Sperry concluded that each individual optic nerve and tectal neuron used some form of chemical marker which dictated their connectivity during development.

In Wernicke's this occurs specifically in the mamillary bodies, medial thalami, tectal plate, and periaqueductal areas.

Focal brain stem tumours that arise at the top back of the midbrain (tectal gliomas) should be managed conservatively, without surgical removal.

The discharge patterns of prey-selective tectal neurons in response to prey objects - in freely moving toads - "predicted" prey-catching reactions such as snapping.

Only one part of the pulvinar is particular, the intergeniculate or inferior pulvinar, which receives tectal afferents and which has a visuotopic map.

The inferior colliculi together with the superior colliculi form the eminences of the corpora quadrigemina, and also part of the tectal region of the midbrain.

The tectal afferents observed in macaques for instance have probably moved to the lateral region in humans, in VImM and VA.

Pollack IF, Pang D, Albright AL: The long-term outcome in children with late-onset aqueductal stenosis resulting from benign intrinsic tectal tumors.

The optic tectum is closely associated with an adjoining structure called nucleus isthmii, which has drawn great interest recently because of new evidence that it makes a very important contribution to tectal function.

In addition, there are upper motor neurons that originate in the brain stem's vestibular, red, tectal, and reticular nuclei, which also descend and synapse in the spinal cord.

Visual input from the retina, or "command" input from the cerebral cortex, create a "bump" of activity in the tectal map, which, if strong enough, induces a saccadic eye movement.

It is suggested that the selectivity of tectal prey feature detectors, type T5.2, is determined by inhibitory influences of pretectal anti-worm detectors of the type TH3.

This pattern of division is reflected in other areas of the cortex, resulting in the observation that cortical and tectal multisensory systems are somewhat dissociated (Wallace, Meredith & Stein, 1993).

Patients with small tectal lesions and hydrocephalus but no other neurological deficits may be treated with cerebrospinal fluid diversion alone and have follow-up with sequential neuroradiographic studies unless there is evidence of progressive disease.

Furthermore, neuroanatomical experiments were carried out where the toad's thalamic-pretectal/tectal connection was lesioned and the resulting deficit noted: the prey-selective properties were abolished both in the responses of prey-selective neurons and in the prey catching behavior.