Nerves - Nerves & Associated Ganglia: Nerve: cordlike...

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Nerve: cordlike organ of PNS consisting of bundles of axons enclosed in layers of connective tissue - each axon enclosed in endoneurium - bundles of fibers (fascicles) enclosed in perineurium - bundles of fascicles enclosed in epineurium - sensory (afferent) nerves: carry impulses toward CNS - motor (efferent) nerves: carry impulses away from CNS - mixed nerves: contain both sensory & motor fibers (can be somatic &/or autonomic) - peripheral nerves classified as spinal nerves or cranial nerves - ganglia: collections of neuron cell bodies associated with nerves in PNS Regeneration of Nerve Fibers: - in general, mature neurons are amitotic (do not divide) - if cell body remains intact, regeneration is possible from accumulation of materials - Wallerian degeneration: begins to disintegrate (debris cleaned up by macrophages & Schwann cells) - Schwann cells .. then, they guide
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Nerves - Nerves & Associated Ganglia: Nerve: cordlike...

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