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Karen Morales period 6 Nervous System - Coggle Diagram

- - - - Bipolar: two processes ex 1axon, 1dendrite (rare)
      - Unipolar: one T-like process ex:two axons
      - Multipolar: three or more processes ex:1 axon, others dendrites ( most common)
      - CLASSIFICATION BY FUNCTION
        
        motor carries impulses from CNS to effectors
        
        internuerons are between sensory and motor
        
        sensory transmits impulses from sensory receptors toward CNS
  - - - Satellite cells surround neuron cell bodies in PNS, they function similar to astrocytes
      - Schwann cells surround all peripheral nerve fibers and form myelin sheaths in thicker nerve
        fibers. They function similar to oligodendrocytes.
- - - - Sensory (afferent) division has somatic and visceral sensory fibers.Somatic sensory fibers convey impulses from skin, skeletal muscles, and joints
        to CNS. The visceral sensory fibers convey impulses from visceral organs to CNS
      - Motor (efferent) division transmits impulses from CNS to effector organs
        
        Somatic nervous system (voluntary) consists of somatic motor nerve fibers that conduct impulses from CNS to skeletal muscle
        
        Autonomic nervous system (involuntary) consists of visceral motor nerve fibers. it conducts impulses from the CNS to smooth muscle, cardiac muscle, and glands
        
        Sympathetic division of the ANS mobilizes body during activity
        
        Parasympathetic division of the ANS promotes maintenance functions and conserves energy
- - - - norepinephrine (NE) is released by adrenergic fibers at sympathetic postganglionic axons. Alpha & Beta receptors bind to NE
      - Acetylcholine(Ach) is released by
        cholinergic fibers at parasympathetic postganglionic axons and preganglionic axons.Nicotinic receptors and Muscarinic receptors bind to Ach.
    - - ACTIONS
        
        Indirect actionwhich means neurotransmitter acts through intracellular second messengers
        
        direct action which means neurotransmitter binds directly to and opens ion channels
      - EFFECTS effects can be excitatory and/or inhibitory. It depends on the receptor it binds to