Nerve tissueNerve tissue
Nerve tissue ve tissue ve tissue N erv e t i s s u e
ContentsNeurogliaNeurogliain CNSNeuroglia in PNSNerveFibersMyelinated nerve fibers in PNSMyelinatednerve fibers in CNSNerve endingsSensory endingsMotor endings
Neuroglia in CNS Neuroglia in PNS Contents Sensory endings Sensory endings Myelinated nerve fibers in PNS Myelinated nerve fibers in CNS Motor endings endings Neuroglia Nerve Fibers Nerve endings
Nerve tissue-review神经胶质细胞Made up of 2typesof cells:neuroglia cellneurons:structural andfunctionalunit神经元neuronneuroglia,supporting,protectingandnourishingneuroncell bodyneucleusneuronmembranscytoplasmNisslebodiesdendriteprocessaxonAxolemma;axoplasm;hillockaxonterminal(synapses)presynapticelementsynapticvesiclessynapsessynaptic cleft:postsynapticelement:receptorsandionicchanne
Made up of 2 types of cells: neurons: structural and functional unit neuroglia;supporting, protecting and nourishing neuron neuron cell body cell body neucleus neucleus membrans membrans cytoplasm Nissle bodies Nissle bodies process process dendrite dendrite axon Axolemma; axoplasm; hillock Axolemma; axoplasm; hillock axon terminal (synapses) axon terminal (synapses) synapses synapses presynaptic element synaptic vesicles synaptic vesicles synaptic cleft: synaptic cleft postsynaptic element: postsynaptic element receptors and ionic channe receptors and ionic channe Nerve tissue - review
NeurogliaA.General features1. More than neurons by 5-10 times;2. With processes, but notconduct impulses;3.Only nucleiseen withNissl stains. Silver stainingshowsprocesses andcytoplasm;4. Can divide after birth;glioma
A. General features 1. More than neurons by 5 -10 times; 2. With processes, but not conduct impulses; 3. Only nuclei seen with Nissl stains. Silver staining shows processes and cytoplasm; 4. Can divide after birth; glioma Neuroglia
GFAPimmunoractiveastrocyteNeuroglia in CNS1)AstrocytesMost numerous;oval, pale stainingprocessessomanucleus;Many processes:fibrous and protoplasmic;Glial filaments (GFAP):glial fibrillary acid proteinSupport&separateneurons,repair,etc;Helptoformbloodbrainbarrier
1) Astrocytes • Most numerous; oval, pale staining nucleus; • Many processes: fibrous and protoplasmic; • Glial filaments (GFAP); glial fibrillary acid protein • Support & separate neurons, repair,etc; Neuroglia in CNS Help to form blood brain barrier
Blood-brainbarrierendothelial cells with tight junctionscontinuousbasal laminavascularfeet of astrocyteprocessesX
Blood-brain barrier endothelial cells with tight junctions continuous basal lamina vascular feet of astrocyte processes
ClassificationFibrous astrocyte: locate in white matter, with few longprocesses,moreglialfilamentsProtoplasmic astrocyte: locate in gray matter, with shortbranchedprocesses,fewglial filamentsPerivascularBloodfootvesselProtoplasmicFibrousastrocyteastrocyte
Fibrous astrocyte: locate in white matter, with few long processes, more glial filaments Protoplasmic astrocyte: locate in gray matter, with short branched processes, few glial filaments Classification
2)OligodendrocytesMorphologySmallerwithadark-staining nucleus;fewerand shorterprocessesFunction:Formingmyelin sheatharoundaxonsinthecentral neversysterm
2) Oligodendrocytes Morphology Smaller with a darkstaining nucleus; fewer and shorter processes Function: Forming myelin sheath around axons in the central never systerm
3)MicrogliaAstrocyte/MicrogliaSmallest withairregulardark stained nucleiPhagocytic;Derivedfrom.monocytes(MPS)
3) Microglia Smallest with a irregular dark stained nuclei Phagocytic; Derived from monocytes (MPS) Astrocyte / Microglia
4)Ependymalcellscolumnarorcuboidalepitheloid cells;Location:(a)liningventricles ofbrainandcentralcanal of spinal cord.K50398
4) Ependymal cells columnar or cuboidal epitheloid cells; Location: lining ventricles of brain and central canal of spinal cord