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20 Cards in this Set
- Front
- Back
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Cephalization
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concentration of ganglia and sensory receptors in head
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annelids and arthropods
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these contain a well-defined brain towards the anterior end and a ventral nerve cord with ganglia at each segment
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Planarians
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contain ladder-like system
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CNS
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consists of the brain and spinal cord
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PNS
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consists of nerves and ganglion which exist outside the CNS
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dendrites
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short, branched processes which receive impulses from other cells and transmit them to the cell body
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axon
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portion of the neuron which transmits signals to other cells from the cell body
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motor neurons
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conduct signals to effector organs causing muscles to contract and glands to secrete.
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sensory neurons
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conduct signals from periferal body parts to the CNS. they begin at specialized endings called receptors which are sensitive to stimuli.
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interneurons
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conduct signals between parts of the CNS
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neurolemma
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portion of schwann cells that have nuclei and other organelles
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Microglial Cells
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phagocytic cell which migrate and devour microbes/debris
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astrocytes
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these star-shaped cells have cytoplasmic processes which form bridges between capillaries and neurons.
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oligodendroglial Cells
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wrap around axons forming the myelin sheath in the CNS
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Epedemial Cells
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these line cavities in the CNS, produce and circulate cerebral spinal fluid
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-65 mV
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resting potential
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synapse
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junction between an axon and a dendrite
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neurotransmitters
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chemicals which move across the synaptic gap and stimulate the next neuron
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intraventricular foramen
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3rd ventricle is connected to the lateral ones by this
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cerebral aqueduct
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the 4th ventricle is connected to the 3rd by this
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