LS2 Lec 7 Neurons (2 Slides)

LS2 Lec 7 Neurons (2 Slides) - Life Sciences 2 Neurons...

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1 Life Sciences 2 Chapter 44 Dr. Joseph Esdin Nervous System • The nervous system is made of billions of neurons • Neurons are able to communicate with each other and with other cells in the body through electrical and chemical signals
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2 Neurons: LM Neurons: EM
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3 Neurons Dendrites Soma Axon Direction of electrical signal Axon terminals Neurons • Soma – Also known as _____ or cell body – ____ mm in diameter – Abundant protein synthesis organelles • Dendrites – Many extension from cell bodies – Receptive sites for electrical signal
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4 Neurons • Axon – A neuron has only one axon – Initial branching is called _______ – Generate and conduct signals away from soma – Abundant microtubules for transport – Also known as _____ Neurons • Axon terminals – Axon collaterals terminate in many axon terminals – Contain neurotransmitters filled vesicles • Myelin sheaths – Schwann cells produce myelin sheaths that insulate the axon – Nodes of Ranvier are gaps in myelin sheaths along the axon
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5 Classification of Neurons • Neurons are classified: • Based on their structure – Multipolar, bipolar, and unipolar • Based on their function – Sensory, interneurons, and motor neurons Structural Classification • Multipolar neurons have ___ dendrites and ___ axon • 99% of all neurons • Motor neurons and interneurons • Found in brain and spinal cord
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6 Structural Classification • Bipolar neurons have ___ extensions only • Found in ears, nose and eyes • Function as sensory neurons Structural Classification • Unipolar neurons have a short single process and divide into two long branches • Function as sensory neurons
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7 Classification of Neurons • Afferent neurons send information to
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This note was uploaded on 11/18/2009 for the course LS 252006217 taught by Professor Esdin during the Spring '09 term at UCLA.

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LS2 Lec 7 Neurons (2 Slides) - Life Sciences 2 Neurons...

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