Afferent pathways

The mechanism of the reflex arc In the nervous system, Afferent pathways are made of bundles of afferent neurons --otherwise known as sensory or receptor neurons-- which carry nerve impulses from receptors or sense organs toward the central nervous system. This term can also be used to describe relative connections between structures. Afferent neurons communicate with specialized interneurons. (The opposite activity of direction or flow is efferent.) In the nervous system there is a "closed loop" system of sensation, decision, and reactions. This process is carried out through the activity of afferent neurons, interneurons, and efferent neurons. A touch or painful stimulus, por ejemplo, creates a sensation in the brain only after information about the stimulus travels there via afferent nerve pathways. Afferent neurons are pseudounipolar neurons, that have a single long dendrite and a short axon, and a smooth and rounded cell body. The dendrite is structurally and functionally similar to an axon, and is myelinated; it is these axon-like dendrites that make up the afferent nerves. Just outside the spinal cord, thousands of afferent neuronal cell bodies are aggregated in a swelling in the dorsal root known as the dorsal root ganglion. (See efferent nerve.) Contenido 1 Etymology and mnemonics 2 Ver también 3 Referencias 4 External links Etymology and mnemonics Both afferent and efferent come from french, as evolution from latin (much used in medicine) of respectively ad ferentes (latin verb fero : I carry), meaning carrying into, and ex ferentes, meaning carrying away. Ad and ex give an easy mnemonic device for remembering the relationship between afferent and efferent : afferent connection arrives and an efferent connection exits.[1] See also Dorsal horns Efferent pathways Leminiscal system Projection fibers Spinalthalamic tracts Receptor fields References ↑ Mnemonic at 3502 3463 367 115 External links Dorlands/Elsevier n_07/12569826 v·d·e Histology: nervous tissue Neurons (gray matter) soma, axon (axon hillock, axoplasm, axolemma, neurofibril/neurofilament), dendrite (Nissl body, dendritic spine, apical dendrite, basal dendrite) types (bipolar, pseudounipolar, multipolar, pyramidal, Purkinje, granule) Afferent nerve/Sensory nerve/Sensory neuron GSA, GVA, SSA, SVA, fibers (Ia, Ib or Golgi, II or Aβ, III or Aδ or fast pain, IV or C or slow pain) Efferent nerve/Motor nerve/Motor neuron GSE, GVE, SVE, Upper motor neuron, Lower motor neuron (α motorneuron, γ motorneuron) Synapses neuropil, synaptic vesicle, neuromuscular junction, electrical synapse - Interneuron (Renshaw) Sensory receptors Free nerve ending, Meissner's corpuscle, Merkel nerve ending, Muscle spindle, Pacinian corpuscle, Ruffini ending, Olfactory receptor neuron, Photoreceptor cell, Hair cell, Taste bud Glial cells astrocyte, oligodendrocyte, ependymal cells, microglia, radial glia Myelination (white matter) Schwann cell, oligodendrocyte, nodes of Ranvier, internode, Schmidt-Lanterman incisures, neurolemma Related connective tissues epineurium, perineurium, endoneurium, nerve fascicle, meninges This page uses Creative Commons Licensed content from Wikipedia (ver autores).

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