The larynx is located in the lower anterior neck region. The larynx is suspended from the hyoid bone by a membrane. The larynx performs several functions in humans.
Its primary function is to control the volume of the air passing through the air passageways, to and from the alveoli of the lungs. The larynx also produces selected vibration frequencies in the moving column of air.
A pair of folds is found at the bottom of the vestibule of the larynx. These are called the vocal folds or true vocal cords. The vocal folds can be drawn apart or pulled together, altogether forming the glottis.
Thus, the vocal folds are used to control the size of the opening between them, which is called the rima glottidis. In Valsalva's maneuver, the lungs are filled with air and the rima glottidis is closed tightly.
When Valsalva's maneuver is followed by a sudden opening of the rima glottidis, the result is a cough.
A column of air flows out through the oral cavity, where it is chopped into bits of speech known as phonemes.
Speech sounds produced when the oral cavity is not blocked are called vowels. Sounds resulting from the closing or chopping action of the oral cavity are known as consonants.
Log in to save your progress and obtain a certificate in Alison’s free Introduction to the Human Respiratory System online course
Sign up to save your progress and obtain a certificate in Alison’s free Introduction to the Human Respiratory System online course
Please enter you email address and we will mail you a link to reset your password.