Normal sound

Vesicular breathing¹

Vesicular breathing²

Bronchial breathing¹

Bronchovesicular breathing¹

Patological sounds

Asthma wheezing¹

Wheezing¹

Wheezing²

Fine rales¹

Corse crackles²

Severe stridor¹

Inspiratory stridor²

Early mild stridor¹

Tracheal sound¹

Pleural friction¹

Pleural friction²

Source:
¹http://faculty.etsu.edu
²http://www.littmann.com
³ http://www.med.umich.edu