# Source Transcript

This transcript was extracted from the representative auditory transduction
lecture excerpt used in the public PDF-MD sample pack.

Original slide pages selected: 5, 8, 10, 11, 15, 20, 30, 40.

The transcript records the selectable PDF text layer only. Labels that exist
inside rasterized figures are represented in the generated PDF-MD output
when the Hybrid pass routes those pages through OCR.

```text
SOUNDS PRODUCED BY MUSICAL INSTRUMENTS OR THE HUMAN VOICE CONSIST OF MANY
                                 TONES
            OUR HEARING SYSTEM PERFORMS A FREQUENCY ANALYSIS
                     OUR BRAIN PERFORMS A SYNTHESIS




  THE FUNDAMENTAL HARMONIC THE LOWEST FREQUENCY OF A PERIODIC WAVEFORM
                          OUTER EAR
                THE PART MOST VISIBLE IS THE PINNA
     IT FUNNELS SOUND WAVES INTO THE EXTERNAL AUDITORY CANAL




                 THE OUTER EAR STRUCTURES MUST

      FOCUS SOUND WAVES ON THE TYMPANIC MEMBRANE
SOUND CAUSES THE TYMPANIC MEMBRANE TO VIBRATE LIKE A DRUM
                            MIDDLE EAR
                         THE EUSTACHIAN TUBE
             CONNECTS THE MIDDLE EAR TO THE NASOPHARYNX


TO EQUALIZE THE AIR PRESSURE ON OPPOSITE SIDES OF THE TYMPANIC MEMBRANE
                             (SWALLOWING)
PUSH   PULL
➢ THE SCALA VESTIBULI
      ❖ REISSNER’S MEMBRANE
SEPARATES THE SCALA VESTIBULI
FROM THE MIDDLE COMPARTMENT

➢ THE SCALA MEDIA
      ❖ THE BASILAR MEMBRANE
SEPARATES THE SCALA MEDIA FROM

➢ THE SCALA TYMPANI
        TRAVELING
    PRESSURE WAVES




               SCALA VESTIBULI PRESSURE INCREASE
PRESSURE WAVES DISPLACE THE REISSNER’S AND THE BASILAR MEMBRANE
```
