Lecture 6_neurological system_CNS student version 16.11.2020.pdf

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NUR101 Human Biological Science 1The Neurological SystemPart AIntroduction of Nervous System andCentral Nervous System (CNS)Monly YEUNG18thNov 2020Lecture 6
Section: AIntroduction ofthe NervousSystem2
3Source of the image: Hole’s human anatomy & physiology (2019)Nervous System(A network of neurons)Central Nervous System(CNS)BrainSpinal CordPeripheral Nervous System(PNS)Cranial NervesSpinal Nerves
4Source of the image: E resource form Vital Source, Principles of Anatomy & Physiology (2017)
Organization of the Nervous System5Principles of Anatomy and Physiology Set (2017)
Organization of the Nervous SystemWith a mass of only 2 kg, about 3% of total body weight, thenervous systemisone of thesmallestand yet themost complexof the 11 body systems.Two main subdivisions: the central nervous system(CNS)and the peripheralnervous system(PNS).The brain is the part ofthe CNSthat islocatedin theskulland contains about85billion neurons.The spinal cordcontains about100 million neurons.The CNSprocessesmany different kinds of incoming_________ information.It is also the source ofthoughts, emotions,andmemories.Most signalsthatstimulatemuscles to ________andglands to _______originate in the CNS.6
7The brain and spinal cord (tan) make up the central nervous system. The peripheral nervous system (dark gold)mostly consists of pairs of cranial nerves, spinal nerves, and associated gangliaSource of the image: E resource form Vital Source, Human Anatomy & Physiology (2019)
8Source of the image: E resource form Vital Source, Principles of Anatomy & Physiology (2017)
Primary function of Nervous System9Sensory function:Sensory receptorsdetectinternal stimuliThissensory informationis thencarried intothebrainandspinal cordthroughcranial and spinal nerves.Integrative function:The nervous systemprocessessensory information by analyzing it andmakingdecisions for appropriate responsesan activity known asintegration.Motor function:Once sensory information is integrated, the nervous systemmay elicitanappropriate motor responseby activatingeffectors(muscles and glands)through cranial and spinal nerves.Stimulationof the effectors causes musclestocontractandglands to secrete.
Section BClassification the structures ofneuron and neuroglia10
11Histology of nerve cellsSource of the image: Visible body, Anatomy and physiology (2019)
12NeuronNervous tissue comprises two types of cellsneuronsandneuroglia*Nervous TissueNeuronSource of image: Visible body, Anatomy and physiology (2019)
13Structure of the neuronSource of the image: E resource form Vital Source, Human Anatomy & Physiology (2019)
Neurons: nerve cellsHighly specialized totransmit messages(nerve impulse) from one part ofthe body to another.Neurons can be different structure from one another, they may have manycommon features (e.g. cell body, axon terminal, myelin sheath and so so).

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Term
Winter
Professor
NoProfessor
Tags
anatomy physiology, Human Anatomy Physiology

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