* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
Download Nervous Tissue - Fisiokinesiterapia
Neuroscience in space wikipedia , lookup
Resting potential wikipedia , lookup
Haemodynamic response wikipedia , lookup
Electrophysiology wikipedia , lookup
Neuromuscular junction wikipedia , lookup
Subventricular zone wikipedia , lookup
Action potential wikipedia , lookup
Axon guidance wikipedia , lookup
Synaptic gating wikipedia , lookup
Feature detection (nervous system) wikipedia , lookup
Development of the nervous system wikipedia , lookup
Neurotransmitter wikipedia , lookup
Single-unit recording wikipedia , lookup
Chemical synapse wikipedia , lookup
End-plate potential wikipedia , lookup
Nervous system network models wikipedia , lookup
Molecular neuroscience wikipedia , lookup
Synaptogenesis wikipedia , lookup
Neuropsychopharmacology wikipedia , lookup
Neuroregeneration wikipedia , lookup
Channelrhodopsin wikipedia , lookup
Clinical neurochemistry wikipedia , lookup
Node of Ranvier wikipedia , lookup
Nervous Tissue Functional composition of the PNS. Fig. 48.17 Copyright © 2002 Pearson Education, Inc., publishing as Benjamin Cummings A closer look at the (often antagonistic) divisions of the autonomic nervous system (ANS). Fig. 48.18 Copyright © 2002 Pearson Education, Inc., publishing as Benjamin Cummings Functions of the Nervous System Sensory Motor Integrative / association Neuroglia Astrocytes Microglia Ependymal Cells Oligodendrocytes Schwann Cells Satellite cells Found in the CNS only Schwann cells are found within the PNS. Form a myelin sheath by insulating axons. Fig. 48.5 Copyright © 2002 Pearson Education, Inc., publishing as Benjamin Cummings Measuring Membrane Potentials. An unstimulated cell usually have a resting potential of -70mV. Fig. 48.6a Copyright © 2002 Pearson Education, Inc., publishing as Benjamin Cummings The Action Potential: All or Nothing Depolarization. If graded potentials sum to ≈-55mV a threshold potential is achieved. This triggers an action potential. Axons only. Fig. 48.8c Copyright © 2002 Pearson Education, Inc., publishing as Benjamin Cummings Saltatory conduction. In myelinated neurons only unmyelinated regions of the axon depolarize. Thus, the impulse moves faster than in unmyelinated neurons. Fig. 48.11 Words to Know Wallerian degeneration Multiple sclerosis Epilepsy Neuropathy Guillain-Barre Syndrome Rabies Summation: graded potentials (EPSPs and IPSPs) are summed to either depolarize or hyperpolarize a postsynaptic neuron. Fig. 48.14 produce different effects on different types of cells Acetylcholine. Excitatory to skeletal muscle. Inhibitory to cardiac muscle. Secreted by the CNS, PNS, and at vertebrate neuromuscular junctions. Biogenic Amines. Epinephrine and norepinephrine. Can have excitatory or inhibitory effects. Secreted by the CNS and PNS. Secreted by the adrenal glands. Dopamine Generally excitatory; may be inhibitory at some sites. Widespread in the brain. Affects sleep, mood, attention, and learning. Secreted by the CNS and PNS. A lack of dopamine in the brain is associated with Parkinson’s disease. Excessive dopamine is linked to schizophrenia. Serotonin. Generally inhibitory. Widespread in the brain. Affects sleep, mood, attention, and learning Secreted by the CNS.