The organization of the projection from the lateral geniculate body to the striate cortex in the squirrel monkey has been re-examined using the anterograde and retrograde transport of horseradish peroxidase (HRP) and wheat germ agglutinin conjugated to HRP. The results confirm earlier findings that the projections of the magnocellular and parvocellular layers of the lateral geniculate body term...

BACKGROUND Endoscopic transcanal approaches to the facial nerve allow excellent exposure of the tympanic facial nerve. This approach becomes limited when access is required to the more proximal geniculate ganglion and labyrinthine portion of the facial nerve. The aim of this report was to determine the feasibility of a transmastoid endoscopically assisted approach to the geniculate ganglion and...

The effects of chronic administration of efavirenz commonly used as part of Highly Active Antiretroviral Therapy (HAART) for the treatment of Human Immunodeficiency Virus (HIV) type-1 therapy on the DNA of the intracranial visual relay centre namely the superior colliculus and lateral geniculate body of adult Wistar rats were carefully studied. The rats of both sexes (n=20), with an average wei...

BACKGROUND Lack of the relevant data in the literature and possible clinical significance of the geniculate ganglion vasculature inspired us to examine the vessels of this ganglion. MATERIALS AND METHODS Twelve temporal bones were taken during autopsy and microdissected. Four geniculate ganglions were taken as well, serially sectioned and used for haematoxylin-eosin and trichrome staining, an...

The projections from the retina through the lateral geniculate nucleus to the visual cortex in the cat are comprised of three parallel, independent pathways. These three pathways involve, respectively, W-, X-, and Y-cells in the retina and the lateral geniculate nucleus. In this study, we investigated the morphology of those neurons in the C laminae of the lateral geniculate nucleus that receiv...

The lateral geniculate body of both primates and subprimates has in recent years been the subject of many valuable studies which have led to a darification of the manner of termination of the retinal optic fibers and the cortical projection of the geniculo-clcarine fibers. These studies were based on experimental lesions of the retina, section of the optic tract and optic radiation, and cortica...

We carried out a study to establish ribonucleic acid (RNA) content in the nucleus and cytoplasm of single neuronal cells from the dorsal lateral geniculate nucleus (dLGN) of 3-30 month-old rats. Mean RNA content was calculated as the product of RNA concentration and nuclear or cytoplasmic surface. The analysis of neuronal nuclei revealed no significant differences in RNA concentration, nuclear ...

We have studied the spatiotemporal receptive-field organization of 144 neurons recorded from the dorsal lateral geniculate nucleus (dLGN) of adult cats and kittens at 4 and 8 wk postnatal. Receptive-field profiles were obtained with the use of a reverse correlation technique, in which we compute the cross-correlation between the action potential train of a neuron and a randomized sequence of lo...

Precise point-to-point connectivity is the basis of ordered maps of the visual field. The immaturity of the newborn hamster's visual system has allowed us to examine emerging topography in the geniculo-cortical projection well before thalamic axons have reached their cortical target, layer IV. Using anterograde transneuronal labeling with wheat germ agglutinin conjugated to horseradish peroxida...

The lateral geniculate body (LGN) was morphometrically examined and compared in representatives of four mammalian orders (Insectivora, Rodentia, Lagomorpha, and Carnivora). In each studied species, the lateral geniculate body was divided into two distinct parts: the dorsal nucleus (LGNd) and the ventral nucleus (LGNv). The lateral geniculate body of the common shrew and the bank vole are very s...