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NS102_Lec4_review - NS102 Lecture 4 review seheekim...

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1 THE NEURON– Cell Types Unipolar Bipolar Multipolar Psuedounipolar Golgi type I Golgi type II # of projections From the soma Axon trajectory and length NS102 Lecture 4 review 10/10/06 seheekim soma In coming ax on soma axon dendrites axon UNIPOLAR •None in the vertebrate NS Nervous system •Most frequent neuron in invertebrates •Single axonal projection BIPOLAR •Single dendritic projection •Single axonal projection MULTIPOLAR •Multiple dendritic projections •Single axonal projection soma dendrites axon Found primarily in the PNS Located in the sensory ganglia/ dorsal root ganglia Provide sensory input to spinal cord and brain stem Central process Peripheral process Pain Touch Temperature C N S PSEUDOUNIPOLAR Pseudounipolar neuron Increases velocity Gray Matter Golgi Type I •“long” distance axon •Axon leaves the gray matter and enters the white Golgi Type II •“short” distance axon •Axon does not enter the white matter •Local circuit cells •Important for higher cognitive activity Trajectory and Length of Axon Golgi type I Golgi type II THE NEURON Structure Endocellular Comonents Skeletal components
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2 DENDRITIC SPINES DENDRITE MITOCHONDRIA ENDOPLASMIC RETICULUM AXON HILLOCK MYELIN SHEATH NODES OF RANVIER SYNAPTIC TERMINAL •Receptacle for presynaptic input
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