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Handout 6 - TA Anna Gruzman E-mail [email protected]

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TA: Anna Gruzman Section 6 E-mail: [email protected] 2/14/10 1. Describe the pathway for a monosynaptic and polysynaptic reflex. What would you classify autonomic reflexes as? 2. Describe the function of alpha motor neurons, extrafusal muscle, fiber and muscle spindles. Explain the mechanism of contraction as well as the stretch reflex. What happens to spindle activity when a resting muscle contracts and shortens? 3. The following is an incomplete graph comparing muscle length to afferent sensory action potentials when a muscle contracts. Please… a. Complete the graph by filling in the dashed rectangle assuming gamma motor axons have been cut b. Give a brief, yet complete, description of the normal role of gamma motor neurons in muscle spindle function during muscle contraction. You should include the target of the gamma motor neurons, their stimulus and their function. 4. What is the pathway of the knee-jerk reflex? Would you describe it as monosynaptic or polysynaptic?
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