2.NeuronsB. Structure features of cell bodyCytoplasm(perikaryon)C. other organelles and various inclusions*Golgicomplexes(well-developed)Mitochondria (Scattered)LysosmesLipiddropletsPigment granules: (such as lipofuscin-residue)*etc
c. other organelles and various inclusions Golgi complexes( well-developed) Mitochondria (Scattered) Lysosmes Lipid droplets Pigment granules: (such as lipofuscin-residue) etc. Cytoplasm(perikaryon) 2. Neurons B. Structure features of cell body
2. NeuronSc. The structures of the processesdendritic spinea.dendrite-many, short and divide like the branches of a tree--dendriticspine(mushroom-shaped structure)--cytoplasmic composition: similar to cell body(no Golgicomplexes)--function: receive the information
a. dendrite -many, short and divide like the branches of a tree -dendritic spine( mushroom-shaped structure) -cytoplasmic composition: similar to cell body(no Golgi complexes) -function: receive the information dendritic spine 2. NeuronsC. The structures of the processes
2.NeuronsC. The structures of the processesb.axonAxon hillock--thin, long,fewer branches-structure:* axon hillock:no Nissl body>the beginningpart of axon>a shortpyramid(orconical)-shapedregion*axoplasm:numerous organelles,noNisslbodyaxolemma:plasmamembraneoftheaxon*initial segment: between theaxon hillock andthebeginning of the myelin sheath--function:generateandconductnerveimpulsesalsoreceive informationfrom other neurons
C. The structures of the processes b. axon -thin, long ,fewer branches - structure: axon hillock: no Nissl body ◇ the beginning part of axon ◇ a short pyramid(or conical)-shaped region axoplasm: numerous organelles, no Nissl body axolemma: plasma membrane of the axon initial segment: between the axon hillock and the beginning of the myelin sheath -function: ◇ generate and conduct nerve impulses ◇ also receive information from other neurons Axon hillock 2. Neurons
2.NeuronsD. Classification of neuron :--Accordingto numberofprocessesmultipolarneuronbipolarneuronpseudounipolarneuron--According to the size of cell body and length of axonGolgitypeIneuron:long axon andlargeGolgi type Il neuron: short axon and small
D. Classification of neuron : -According to multipolar neuron bipolar neuron pseudounipolar neuron -According to the size of cell body and length of axon Golgi type I neuron: long axon and large Golgi type II neuron: short axon and small 2. Neurons
MaintypesofneuronsBipolarMultipolarPseudounipolarDendritesMultipolarneuronsBipolar neuronsDirectionofimpulsePseudounipolarneuronsAxonAxonAxonterminalterminalterminalSimplified viewof the 3 maintypes of neuronsBACK
Pseudounipolar neurons Bipolar neurons Multipolar neurons Simplified view of the 3 main types of neurons