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All About Nerve Tissues Essay

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Below is an essay on "All About Nerve Tissues" from Anti Essays, your source for research papers, essays, and term paper examples.

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 provided that the nerve cell body is not damaged

Dendrites
    • Numerous short projections from the...

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