Biomaterial Database

[Connections of various fields of the parietal cortex with the caudate nucleus of the cat brain]. 1988

N M Ipekchian, and L A Avakian

By means of the light and electron microscopy methods efferent connections of the fields 5a, 5b and 7 with the caudate nucleus have been studied. These fields are predominantly projected to the dorsolateral corner of the middle and posterior head of the caudate nucleus. The fields 5b and 7, unlike the field 5a, give also origin to the fibers, terminating in the central part of the head and in the caudate nucleus body. The electron microscopic investigation proves the monosynaptic nature of the fields 5a, 5b and 7 with the dorsolateral part of the middle and posterior parts of the caudate nucleus head. The parietal cortex gives origin, mainly, to fine myelin fibers (0.665 +/- 0.029), terminating in the part mentioned of the caudate nucleus. These fibers form small terminals (0.310 +/- 0.014 to 0.430 +/- 0.020 mcm) with asymmetrical membranous thickening; these terminals end on the spines (with a poorly expressed spine apparatus) of the dendrites, evidently, of the middle spine cells. Axonal terminals of the parietal cortex form axodendritic terminals extremely seldom. Axospinous synapses on the dendrites of the middle spine cells, situating in the dorsolateral part of the caudate nucleus head are supposed to be a morphological substrate, ensuring the cortical control of the parietal cortex at the level of the caudate nucleus.

UI	MeSH Term	Description	Entries
D008854	Microscopy, Electron	Microscopy using an electron beam, instead of light, to visualize the sample, thereby allowing much greater magnification. The interactions of ELECTRONS with specimens are used to provide information about the fine structure of that specimen. In TRANSMISSION ELECTRON MICROSCOPY the reactions of the electrons that are transmitted through the specimen are imaged. In SCANNING ELECTRON MICROSCOPY an electron beam falls at a non-normal angle on the specimen and the image is derived from the reactions occurring above the plane of the specimen.	Electron Microscopy
D009186	Myelin Sheath	The lipid-rich sheath surrounding AXONS in both the CENTRAL NERVOUS SYSTEMS and PERIPHERAL NERVOUS SYSTEM. The myelin sheath is an electrical insulator and allows faster and more energetically efficient conduction of impulses. The sheath is formed by the cell membranes of glial cells (SCHWANN CELLS in the peripheral and OLIGODENDROGLIA in the central nervous system). Deterioration of the sheath in DEMYELINATING DISEASES is a serious clinical problem.	Myelin,Myelin Sheaths,Sheath, Myelin,Sheaths, Myelin
D001931	Brain Mapping	Imaging techniques used to colocalize sites of brain functions or physiological activity with brain structures.	Brain Electrical Activity Mapping,Functional Cerebral Localization,Topographic Brain Mapping,Brain Mapping, Topographic,Functional Cerebral Localizations,Mapping, Brain,Mapping, Topographic Brain
D002415	Cats	The domestic cat, Felis catus, of the carnivore family FELIDAE, comprising over 30 different breeds. The domestic cat is descended primarily from the wild cat of Africa and extreme southwestern Asia. Though probably present in towns in Palestine as long ago as 7000 years, actual domestication occurred in Egypt about 4000 years ago. (From Walker's Mammals of the World, 6th ed, p801)	Felis catus,Felis domesticus,Domestic Cats,Felis domestica,Felis sylvestris catus,Cat,Cat, Domestic,Cats, Domestic,Domestic Cat
D002421	Caudate Nucleus	Elongated gray mass of the neostriatum located adjacent to the lateral ventricle of the brain.	Caudatus,Nucleus Caudatus,Caudatus, Nucleus,Nucleus, Caudate
D002540	Cerebral Cortex	The thin layer of GRAY MATTER on the surface of the CEREBRAL HEMISPHERES that develops from the TELENCEPHALON and folds into gyri and sulci. It reaches its highest development in humans and is responsible for intellectual faculties and higher mental functions.	Allocortex,Archipallium,Cortex Cerebri,Cortical Plate,Paleocortex,Periallocortex,Allocortices,Archipalliums,Cerebral Cortices,Cortex Cerebrus,Cortex, Cerebral,Cortical Plates,Paleocortices,Periallocortices,Plate, Cortical
D000818	Animals	Unicellular or multicellular, heterotrophic organisms, that have sensation and the power of voluntary movement. Under the older five kingdom paradigm, Animalia was one of the kingdoms. Under the modern three domain model, Animalia represents one of the many groups in the domain EUKARYOTA.	Animal,Metazoa,Animalia