PubMed Health⌕ Search

SEARCH · PubMed Health

Results for “NERVES, SPINAL”

Explore indexed PubMed citations for clinical trials, systematic reviews and public health research. Read source abstracts and follow each citation to its original PubMed record.

Quote a phrase for an exact phrase match. Source license links do not imply unrestricted reuse.

At least 559 records · Page 31Linked to original sources
PubMed1984

[Neurinoma of the intracranial and intraspinal spinal nerve].

Two personal cases and a review of the literature permit to distinguish by anatomical, clinical and paraclinical aspects : neurilemmoma of the jugular foramen (type III), neurilemmoma of the bulbar spinal (type I), and of the medullary spinal (type II). This classification permits to choice surgical approach.

Adult↗
PubMed1980

[Interrelationships between embryonal axons and lemmoblasts during the development of rat spinal nerve roots (electron-microscopic study)].

In order to elucidate the earliest interrelations of growing axons and lemmoblasts and the nature of the latter, a submicroscopic investigation of the rat spinal roots at places of their outlet from the neural tube was performed on the 11th and 13th day of embryonic development. The results obtained demonstrated that the spinal roots, both anterior and posterior, are formed by several fine (growing from the marginal layer of the neural tube) cords consisting of tightly packed "naked" axons with no signs of cellular elements inside them. These cords grow from the marginal layer of the neural tube towards periphery with resulting rupture of th tube's external limiting and basal membranes and formation of perforations; neither basal nor limiting membranes pass on the axonal surface. After leaving the neural tube for mesenchyma, the axonal cords get into connections with lemmoblasts that surround them completely. These cells are morphologically identical to poorly differentiated mesenchymal cells, situated nearby, and differ ultrastructurally from glioblasts of the neural tube (their processes form the external limiting membrane). A peculiar feature of lemmoblasts is the absence of a basal membrane and collagenous fibres around them; they are also absent, at this stage of development, in thin-walled capillaries formed from mesenchymal cells. In no case could be observed migration of glioblasts from the neural tube towards periphery and their transition on the cords of growing "naked" axons. The data obtained evidence in favour of the fact that lemmoblasts, surrounding the axonal cords, are formed at the place from poorly differentiated mesenchymal cells.

Animals↗
PubMed1975

[Spinal nerve root distribution of the myelinated and unmyelinated nerve fibers of a cat cutaneous nerve].

The distribution of myelinated and nomyelinated nerve fibres from n. saphenus in the dorsal and ventral roots of the cat spinal cord was investigated, using methods improving the signal-to-noise ratio in the neurogram of the nerve evoked response. Nerve fibres from n. saphneus enter the spinal cord through roots of segments L4-6. In the dorsal roots of these segments the nerve fibres have conduction velocities from 80 to 0.38 m/s. In the ventral roots four groups of the nerve fibres with conduction velocities 80--60, 40--30, 12.0--3.0 and 1.1--0.51 m/s are found that are likely to be afferents. The conditions for low amplitude potentials detection in the spinal cord roots as well as the possible functional significance of the nerve fibres in the ventral roots are discussed.

Action Potentials↗
PubMed1983

[Changes in the reflex discharges and electrotonic potentials of spinal nerve roots in the rat upon exposure to biologically active substances].

The ionic nature of neuronal postsynaptic responses to monoamines, aminoacids and the substance P was studied in the newborn rat isolated spinal cord. The responses of motoneurons to GABA, glycine, noradrenaline and dopamine appeared to be Cl-dependent. The depolarization of motoneurons induced by L-glutamate and 5-hydroxytryptamine was Na-dependent whereas the same response to the substance P was Cl-dependent. Primary afferent depolarization with GABA is Cl-dependent whereas if induced by glycine and 5-hydroxytryptamine it is Na-dependent. Neurochemical and ionic profiles of mono- and polysynaptic ventral and dorsal root potentials are discussed.

Animals↗