NPB101L Practical Review

NPB101L Practical Review

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Unformatted text preview: s Experiments: Part 1: H- Reflex TIBIAL S&mulated the ___________ nerve and recorded the electrical ac&vity of the ____________________ GASTROCNEMIUS Segment 7, 6:16:53 PM 4.25 M- Wave 2.12 mV EMG (5 - 1000 Hz) H- Wave 0.00 -2.12 543.12 554.67 milliseconds 566.23 577.78 (A) Effect of an increase in s&mulus intensity Increase in s&mulus voltage will cause: •  H- wave to increase, reach a max then decrease in amplitude •  M- wave will take a higher voltage to appear and will increase to a max then plateau WHY? •  See H- wave at a lower voltage because IA afferents are larger in diameter than α- MN and are easier to excite •  An α- MN that is s&mulated directly to create an M- wave cannot be s&mulated by IA afferents to create an H- wave, due to refractory period of the neuron S&mul...
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This note was uploaded on 03/28/2013 for the course NPB 101L taught by Professor Goldberg during the Winter '08 term at UC Davis.

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