Bio47S11HO24

Bio47S11HO24 - Biology 47 - Human Anatomy Lecture 24...

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1 Biology 47 - Human Anatomy Lecture 24 Nervous Tissue Neuroglial Cells (Glial Cells): “ Helper Cells Support, Nourish, protect, & assist neurons 1. Astrocytes : “Star-shaped” Long cellular process surround neuron: Physically : Guide : Assist in : Connect neurons to capillaries : Isolate neurons from direct : Regulate exchange of nutrient, gases & wasste Blood Brain Barrier ( BBB ) 2. Microglia : Phagocytic immune cells present w/in the CNS: Clean and protect the: Enter ONLY during CNS : WBCs DO NOT enter in the : Can mitotically divide in response to : 3. Oligodendrocytes : Surround & Cover Axons w/in the CNS : Cells surround axons Cell wrappings collectively called : Myelination functions to : a. Provide : b. Increase rate of : Cell wrappings INSULATE the axon: NO current sent in “insulated” or : Action Potential only occurs in non-insulated: UNmyelinated regions: Current to “jumps” from : Increasing rate of Action Potential :
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2 4. Schwann Cells : Myelinate neurons in : Function : Same as oligodendrocytes : Except in : Myelinated Regions : • Appear White due to : Unmyelinated Regions : • Appear Gray : Communicating regions Neuron Classifications : Functional classification : 1. Sensory Neuron : AFFERENT Collect sensory stimuli & carry to : Sensory Receptors : Specialized neurons respond to environmental changes 2. Motor Neuron : EFFERENT Stimulates or modifies : Effectors : 3. Interneurons : ASSOCIATION NEURONS Connect : Allow communication between : Responsible for
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This note was uploaded on 09/02/2011 for the course BIO 47 taught by Professor Peters during the Spring '11 term at West Valley.

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Bio47S11HO24 - Biology 47 - Human Anatomy Lecture 24...

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