Double Block #3 Neuropsychiatry April 29, 2009
Posted by Joselyn Todd in Uncategorized.trackback
***Today at the start of class your comment regarding your visit on last Wed. is due.
1.) We will begin today by having Jim and then Marcella give their presentations on the respective cranial nerves that they were assigned.
2.) Next, in the comments of this post you should write a
a.) 1 paragraph summary of what an EMG test is, how it is done, and what it measures. b.) Give a hypothesis as to which will generate the greatest amount of voltage- jaw clenching, chewing a marshmallow, chewing a raw carrot, chewing gum, or chewing beef jerky. Rank order these.
c.)Provide a MLA citation (not a URL) for your research.
3.) Next you will complete the “Introduction to EMG” experiment with a partner. Each person must complete their own handout and turn in the images of each “chewing motion”. You can print to Rm. 203. Write your name and the chewing motion on the graph.
4.) If you complete the activity, you should choose an illicit drug ( and the effects of that drug on the nervous system. You must have your subject approved by Ms. Todd. You will create a 10 minute movie using Adobe Premiere about the drug and it’s effects. You will hand in your script for this movie with MLA citations. Any images used must be cited using MLA citations.
a.) An EMG test is used to record the electrical activity of muscles. Tests muscle strength and tests to see if a weakness is due to a nerve disorder. EMGs can also be used to isolate the level of nerve irritation or injury.
b.) jaw clenching, chewing a raw carrot, chewing beef jerky, chewing gum, chewing a marshmallow
An EMG test is a test that records the electrical activity of muscles, when muscles are being used they create an electrical current. this current should be proportionate to the level of muscle activity.
This test is done by inserting a needle through the skin into the muscle, the electrical activity is then recorded through the needle absorbing th electrical current. the information is then displayed on a ocilloscope and can be recorded with a speaker too.
i think that chewing the raw carrot will create the most electrical activity because it should take more effort to bite through a raw carrot than any of the other activities written above.
An EMG is often apart of a nerve conduction study. An EMG tests the electrical activity of muscles using an ele. Needles will be inserted into the muscles being tested, while the needles are inserted the technician will ask the patient to move their muscles while they are being monitored through a oscilloscope. The EMG is measured in volts. A testing can range anywhere from 50uV to 20-30mV.
-Chewing a Carrot
-Chewing a Marshmallow
-Chewing Jerky
-Chewing Gum
-Jaw Clenching
- Chewing a carrot
- Jaw clenching
- Chewing beef jerky
- Chewing gum
- Chewing a marshmallow
1. a) Electromyogram (EMG) tests are used to record the electrical currents produced by muscles when flexing or stretching them. EMG’s are also sometimes referred to as myograms and they are also able to detect abnormal electrical currents produced by muscles. These tests are most often given to patients who show signs of muscle weakness, muscle dystrophy, or nerve damage. Typical EMGs consist of inserting a needle, which acts as an electrode. The doctor issuing the test, may or may not ask the patient to contract the muscle in question as the electrode records electrical output.
b) – Jaw Clenching
– Chewing Beef Jerky
– Chewing a Raw Carrot
– Chewing Gum
– Chewing a Marshmallow
c) http://www.medicinenet.com/electromyogram/article.htm
An EMG test, or an electromyogram, is a recording of the electrical activity within muscles. The activation of the muscles by the nerves causes changes in the ion flow across the cell membranes. Surface electrodes are placed on the skin over the muscle which is tested, and the electrical activity is recorded in a graph. The electrical activity recorded directly correlates with the strength of the muscle.
My hypothesis is that the items which require more muscle strength to chew will provide a larger electrical signal, and those which require less jaw strength to chew will provide a smaller electrical signal.