1. General Characteristics :

    1. functions to operate reflex actions

    2. composed of visceral efferent fibers

    3. autonomic fibers are associated with ganglia that integrates impulses before passing out to effectors

    4. ganglia provide some independence from the CNS

    5. autonomic system is divided into two parts

      1. parasympathetic
      2. sympathetic

  2. Autonomic Nerve Fibers

    1. fibers are visceral efferent fibers

    2. sympathetic fibers leave spinal cord and synapse in the sympathetic ganglia near the spinal cord

    3. parasympathetic fibers begin in brain stem and sacral region and synapse in ganglia near visceral organs.

  3. Autonomic Neurotransmitters

    Sympathetic :preganglionic fibers - acetylcholine

    postganglionic fibers - norepinepherine

    postganglionic fibers are adrenic

    receptors are as follows :

    alpha 1
    alpha 2
    beta 1
    beta 2

    adrenal medulla augments action of sympathetic

    Parasympathetic :

    Preganglionic fibers - acetylcholine

    Postganglionic fibers - acetycholine

    Cholinergic receptors

    • 2 types :

    • nicotinic type 1 - parasympathetic and sympathetic post
      ganglionic fibers

    • nicotinic type 2 - skeletal muscle

    • muscarinic type 1 - (para) heart and smooth muscle

    • muscarinic type 2 - (sympathetic) sweat glands, blood vessels to skeletal muscle