All About Nerve Tissues Essay

802 WordsJan 22, 20114 Pages
Nervous Tissue Functions of Nerve Tissue • Allows an organism to sense stimuli in both the internal and external environment. • The stimuli are analyzed and integrated to provide appropriate, coordinated responses in various organs. • The afferent or sensory neurons conduct nerve impulses from the sense organs and receptors to the central nervous system. • Internuncial or connector neurons supply the connection between the afferent and efferent neurons as well as different parts of the central nervous system. • Efferent or somatic motor neurons transmit the impulse from the central nervous system to a muscle (the effector organ) which then react to the initial stimulus. • Autonomic motor or efferent neurons transmit impulses to the involuntary muscles and glands. Neuron • It is the functional unit of the nervous system. • It gathers and processes information from receptors in contact with the external environment and generates appropriate response signals. • Networks of neurons help combine multiple sensory signals responsible for complex behaviors like abstract thinking, learning, memory, language, planning, etc. • When damaged, they do not regenerate. [pic] Structural Components of a Neuron Cell Body (soma) • contains the nucleus and most of the organelles responsible for maintaining the neuron's metabolic functions. Axon • Stretches from the cell body to a distance ranging from several millimeters up to one meter • Transmit nerve signals away from the nerve cell body towards other nerves, muscle, or glands • Neurons only have one axon • Many, but not all, axons are sheathed in multiple layers of a lipid-rich material called myelin [functions as a kind of electrical "insulation" greatly facilitating nerve impulse transmission] • Axons of the PNS can regenerate

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