CORPORATE MIND MAP

SUMMARY OF EEG (ELECTROENCEPHALOGRAPHY)

Clinical Role

INTRODUCTION

• Physiological alternations in brain activity.

• Diagnosis of conditions-insomnia sleep apnea, epilepsy, & herpes Simplex Encephalitis.

• Used in ICU during surgeries.

• EEG is used to evaluate the electrical activity of the brain, with using various surface electrodes.

• The signal is amplified , filtered, & displayed in the EEG machine.

History

Source of EEG Rhythmicity

• Richard Carton discovered prosperities of the brain by recording the electrical activity in animal in 1875.

• Hans Berger recorded first human EEG in 1924.

• Thalamus

• Normal Alpha Rhysthms

• Oscillations of sleep spindles

Pyramidal Cells Produces Bulk of EEG Signals

• Layer III and V of cerebral cortex

• RMP -65 mV

• Postsynaptic Potential

• EPSP (Sodium)

• IPSP (Chloride/Potassium)