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27 Cards in this Set
- Front
- Back
- 3rd side (hint)
What are the #2 divisons of the nervous system
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1) central nervous system
2) peripheral nervous system |
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central nervous system
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division located within the skull & spine
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peripheral nervous system
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division of nervous system that is located outside the skull & spine
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#2 divisions of PNS
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1) somatic Nervous system
2) autonomic nervous system |
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SNS
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part of the PNS that interacts with external environment;(composed of afferent & efferent nerves
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afferent nerves
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carry sensory signals from the skin, skeletal muscles, joints, eyes, ears, & etc... to CNS
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efferent nerves
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carry motor signals from CNS to skeletal muscles
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ANS
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part of the PNS that regulates the body's internal environment.
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# 2 kinds of efferent nerves in ANS
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1)sympahetic nerves
2) parasympathetic nerves |
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sympathetic nerves
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those nerves that project from CNS in the lumbar & thoracic regions of spinal cord
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parasympathetic nerves
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project from the brain & sacral region of the spinal cord
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#3 conventional views of functions of sympathetic systems
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1) stimulate, organize, & mobilize energy resources in threatning situations
2) each autonomic target organ receives opposing parasympathetic input 3) sympathetic /\'s are indicative of psychological arousal |
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#3 conventional views of functions of parasympathetic systems
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1) nerves act to conserve energy
2)target organ recieves opposing sympathetic input 3) /\'s are indicative of psychological relaxation |
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#3 meninges
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1)dura mater
2) arachnoid membrane 3) pia mater |
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dura mater menige
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outer tough membrane
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tough mother
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arachnoid meninge
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next layer membrane inside dura mater
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spider web like
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pia mater meninge
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inner most meninge which adheres to the surface of CNS
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pious mother
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Cerebral Spinal Fluid
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protective fluid that fills the sub arachnoid space, central canal of spinal cord, & cerebral ventricles of brain
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central canal
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small central channel that runs the length of spinal cord
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cerebral ventricles
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four large internal chambers of brain
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choroid plexus
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networks of capillaries that protrude into the ventricles from pia mater lining
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blood-brain barrier
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mechanism that keeps certain toxic substances in the blood from passing into brain tissue
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#4 kinds of glial cells
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1) oligodendrocytes
2) Schwann cells 3) Astrocytes 4) microglia |
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oligodendrocyte
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glial cells that myelinate axons of the CNS
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Schwann cells
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glial cells that compose the myelin sheaths of PNS axons & promote regeneration
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Astrocytes
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large star shaped glial cells that play a role in passage of chemicals from blood into CNS
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Microglia
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respond to injury or disease by engulfing cellular debris and triggering inflammatory responses.
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