Recent evidence indicates that the rat claustrum interconnects the motor cortical areas in both hemispheres. To elucidate the functional specificity of the interhemispheric connections between the claustrum and primary motor (MI) cortex, anterograde tracer injections in specific parts of MI were paired with retrograde tracer injections in homotopic sites of the opposite hemisphere. In addition ...

The purpose of this study was to reveal the computer-aided three-dimensional (3D) appearance, the dimensions, and neighbourly relations of the claustrum and make a stereotactic approach to it by using serial sections taken from the brain of a human cadaver. The Snake technique was used to carry out 3D reconstructions of the claustra and surrounding structures. The photorealistic imaging and ste...

The claustrum of the cat was studied to determine the extent of its projection to the cerebral cortex. Neurons in the bilateral dorsal claustrum are labeled by retrograde axonal transport of horseradish peroxidase (HRP) from injection sites of different neocortical areas with preponderance to the ipsilateral side. It is revealed that the dorsal claustrum projects to almost entire regions of the...

Injections of tritiated amino acid into the pretectothalamic border area of cats resulted in the appearance of numerous silver grains in the ipsilateral claustrum. The accumulation of grains was especially abundant in the dorsomedial area of the central part of the claustrum. These results indicate the presence of substantial projection from the pretectothalamic border area to the claustrum. It...

Ascending tectal axons carrying visual information constitute a fiber pathway linking the mesencephalon with the dorsal thalamus and then with a number of telencephalic centers. The sauropsidian nucleus rotundus and its mammalian homologue(s) occupy a central position in this pathway. The aim of this study was analyzing the rotundic connections in reptiles and birds in relation with comparable ...

The claustrum has been described in the forebrain of all mammals studied so far. It has been suggested that the claustrum plays a role in the integration of multisensory information: however, its detailed structure and function remain enigmatic. The human claustrum is a thin, irregular, sheet of grey matter located between the inner surface of the insular cortex and the outer surface of the put...

The claustrum is a telencephalic structure which consists of dorsal segment adjoining the insular cortex and a ventral segment termed also endopiriform nucleus (END). The dorsal segment (claustrum) is divided into a dorsal and ventral zone, while the END is parcellated into dorsal, ventral and intermediate END. The claustrum and the END consist of glutamatergic projection neurons and GABAergic ...

CONTENTS Introduction ........................................................ Material and methods ............................................... Literature .......................................................... Description of material .............................................. Certain general characteristics of the brain of Tadarida ............ The nuclear groups ......................

The claustrum seems to have been waiting for the science of connectomics. Due to its tiny size, the structure has remained remarkably difficult to study until modern technological and mathematical advancements like graph theory, connectomics, diffusion tensor imaging, HARDI, and excitotoxic lesioning. That does not mean, however, that early methods allowed researchers to assess micro-connectomi...

The claustrum, a poorly understood subcortical structure located between the cortex and the striatum, forms widespread connections with almost all cortical areas, but the cellular organization of claustral circuits remains largely unknown. Based primarily on anatomical data, it has been proposed that the claustrum integrates activity across sensory modalities. However, the extent to which the s...