HMB302H1 Study Guide - Midterm Guide: Lysosome, Schwann Cell, Perineurium

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Nervous Tissue
Nervous Tissue
•Comprised of millions of neurons with a multitude of interconnections forming a
complex system of neuronal communications within the body
•Nervous system is organized into the central nervous system (CNS) and the
peripheral nervous system (PNS)
•Our interest is on the PNS which includes nerves and their associated ganglia
oDorsal…ganglia, highly structured and very organized
Nervous System
•Divided into two components:
oSensory (afferent) component - receives and transmits impulses to the CNS for
processing
oMotor (efferent) component - which originates in the CNS and transmits impulses to
effector organs throughout the body
•Our interest is in the motor (efferent component)
Motor Component
Divided functionally into:
•Somatic nervous system - provides impulses to the skeletal muscles (voluntary)
•Autonomic nervous system - provides motor impulses to smooth muscles of the viscera,
cardiac muscle, and a variety of glands (involuntary)
oNo control over, everything is done for you
oIt's under your body's control not your control
Cells of the Nervous System
•Two categories:
oNeuron (nerve cell) - responsible for receptive, integrative and motor function of the
nervous system
•Responsible for generating the messages
oNeuroglial cells - responsible for supporting and protecting neurons
•Consists of three parts:
oCell body (perikaryon or soma)
oDendrites - specialized processes for receiving stimuli from sensory cells, axons and
other neurons
oAxon - conduct impulses away from the soma to other neurons, muscles or glands
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Document Summary

Two categories: neuron (nerve cell) - responsible for receptive, integrative and motor function of the nervous system. Responsible for generating the messages: neuroglial cells - responsible for supporting and protecting neurons. Consists of three parts: cell body (perikaryon or soma, dendrites - specialized processes for receiving stimuli from sensory cells, axons and other neurons, axon - conduct impulses away from the soma to other neurons, muscles or glands. Investments in skeletal muscle (the three layers) - we have them here too and they are called - neurium. Surrounding the myelin sheath is what we call the endoneurium (reticular tissue) so in fact we are gluing these neurons together. Surrounding this bundle is the perineurium which is made out of dense irregular collagenous ct. Surrounding the actual bundle is the epineurium = dense irregular collagenous ct. Contains a large pale staining nucleus which is usually spherical (oval) and is centrally located.

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