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White ramus communicans. The grey and white rami communicantes are responsible for conveying autonomic signals, specifically for the sympathetic nervous system. Their difference in coloration is caused by differences in myelination of the nerve fibres contained within, i.e. there are more myelinated than unmyelinated fibres in the white rami ...
The white ramus communicans (pl.: rami communicantes) from Latin ramus (branch) and communicans (communicating) is the preganglionic sympathetic outflow nerve tract from the spinal cord. Each of the thoracic, and the first and second lumbar nerves contribute a white ramus communicans to the adjoining sympathetic ganglion, unlike the gray rami ...
Projection fiber. The projection fibers consist of efferent and afferent fibers uniting the cortex with the lower parts of the brain and with the spinal cord. In human neuroanatomy, bundles of axons (nerve fibers) called tracts, within the brain, can be categorized by their function into association fibers, projection fibers, and commissural ...
Pictured here is a cross-section showing the gross anatomy of the human brain. Neuroanatomy is the study of the structure and organization of the nervous system. In contrast to animals with radial symmetry, whose nervous system consists of a distributed network of cells, animals with bilateral symmetry have segregated, defined nervous systems.
The reticular formation is a set of interconnected nuclei in the brainstem that spans from the lower end of the medulla oblongata to the upper end of the midbrain. [2] The neurons of the reticular formation make up a complex set of neural networks in the core of the brainstem. [3] It is not anatomically well defined, because it includes neurons ...
Latin. incisura myelini. MeSH. D011901. TH. H2.00.06.2.03015. Anatomical terms of microanatomy. [edit on Wikidata] In neuroscience and anatomy, nodes of Ranvier (/ ˈrɑːnvieɪ / RAHN-vee-ay), [1][2] also known as myelin-sheath gaps, occur along a myelinated axon where the axolemma is exposed to the extracellular space.
Tuberoinfundibular pathway shown in opaque blue, connecting that hypothalamus with the pituitary gland. The tuberoinfundibular pathway refers to a population of dopamine neurons that project from the arcuate nucleus (a.k.a. the "infundibular nucleus") in the tuberal region of the hypothalamus to the median eminence. [1] It is one of the four ...
A neuron, neurone, [1] or nerve cell is an excitable cell that fires electric signals called action potentials across a neural network in the nervous system.Neurons communicate with other cells via synapses, which are specialized connections that commonly use minute amounts of chemical neurotransmitters to pass the electric signal from the presynaptic neuron to the target cell through the ...