Electromyography (EMG) is a diagnostic procedure to assess the health of muscles and the nerve cells that control them (motor neurons). EMG results can reveal nerve dysfunction, muscle dysfunction or problems with nerve-to-muscle signal transmission.

1. EMG
ELECTROMYOGRAPHY
Prepared by Atheena Pandian

2. Electromyography (EMG) is an electrodiagnostic
medicine technique for evaluating and recording
the electrical activity produced by skeletal muscles

3. EMG is performed using an instrument
called an electromyograph to produce
a record called an electromyogram

4. An electromyograph
detects the electric
potential generated by
muscle cells

5. The signals can be
analyzed to detect
medical abnormalities,
activation level, or
recruitment order, or to
analyze
the biomechanics of
human or animal
movement

6. EMG
electrodes

7. Surface (or skin electrodes) and
Inserted electrodes
Needle and
Fine wire electrodes.
There are two main types of EMG
electrodes:
Inserted electrodes have further
two types:
1.
2.

8. Surface electrode measures the
potential available from the
surface of the skin.
Metal Plate Electrodes
Suction Cup Electrodes or Welsh Cup Electrodes
Adhesive Type Electrodes
Multipoint Type Electrodes
Floating Electrodes
Ear Clips and Scalp Electrodes
1.
2.
3.
4.
5.
6.

9. Surface electrode - Metal Plate
Electrodes

10. Surface electrode - Suction Cup Electrodes
or Welsh Cup Electrodes

11. Surface electrode -
Adhesive Type Electrodes

12. Surface electrode -Multipoint Type Electrodes

13. Surface electrode -
Floating Electrodes

14. Surface electrode -
Ear Clips and Scalp
Electrodes

15. Needle Electrode
Fine Wire Electrode
Inserted Electrodes
1.
2.

16. Inserted Electrodes - Needle
Electrode

17. Inserted Electrodes - Fine wire
Electrode

18. EMG Signal - Functioal Block Diagram

19. EMG Signal

20. Good Luck