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Acquire: Foundations in Vocal Anatomy

First a definition, the vocal tract is the cavity where sounds are both initiated and potentially crafted.  It consists of the laryngeal cavity, the pharynx, the oral cavity and the nasal cavity.   For our purposes today we will focus on the laryngeal cavity with a brief nod at the entire vocal tract.

The Larynx

The larynx (sometimes called the voice box) is the organ through which we breathe, prevent swallowed items from entering the lungs, and create sound.  Its outer structure consists of cartilages which create a flexible house for a dynamic intrinsic and extrinsic muscular system. The operation of the larynx is a monument to muscle coordination and interconnectedness.  One could write a book solely on the function of these muscles (and people have done just that), which is to say the following descriptions are by no means all there is to know.  They should provide a light primer on this subject which you can study further if you are curious.

Intrinsic Muscles of the Larynx

The intrinsic muscles are named for the cartilages they attach to.  Like all muscles of the body, the origin is listed first and the insertion point, last.

They are:
Thyroarytenoid muscles – The internal thyroarytenoids are the actual vocal cords, but the muscle as a whole does much more which we will visit in the function portion of this post.

Cricothyroid – Responsible for lengthening and tensing the vocal cords.
Posterior and Lateral Cricoarytenoids – Responsible for opening, closing, and rotating the vocal cords as well as creating necessary compression in the vocal cords when together (lateral).

Transverse and Oblique Arytenoids – These muscles assist vocal function by helping the cords come together and narrowing the space between the arytenoids.

The Extrinsic Muscles of the Larynx

If this graphic of the extrinsic musculatures looks complicated, it is sort of.  All of these function to support and position the larynx within the trachea.  I won’t go into all of these individually because they don’t actually function individually.  In fact, these musculatures all interconnect via fascia all the way to the psoas (and beyond), making the vocal instrument inseparable from the human body as a whole.

That was a quick and dirty overview of the physical structures of the vocal tract.  I recommend that all voice users have a clear mental picture of the vocal tract and where it rests within the body.  Knowing what each muscle is called is not necessary.

Function

  • The larynx houses and protects the airway.
  • Musculatures of the larynx, the ‘vocal cords’ among them, are responsible for sealing when we swallow to prevent food from entering the lungs.  
  • They are a sphincter that regulates the air pressure for defecation and childbirth.
  • And, regulate air pressure for physical exertions such as lifting heavy objects and bearing down.  The creation of grunts is an aural component of this function.
  • Finally, these muscles are also responsible for coughing and throat clearing to dislodge anything that gets through or any fluid that develops within the lung.

These primary functions will always override the production of sound.

How do we make sounds?

To produce sounds, we need a few things.

  1. A power source
  2. A vibrator
  3. Resonators
  4. Articulators
  5. Impulse/Intention

You’ve already met your power source, the lungs, and the muscles which permit their function.  The vibrator is the vocal cords and their supporting musculatures.  The resonator is the part of vocal tract we haven’t discussed yet, your throat, mouth, nose, and sinuses.  The articulators are your lips, jaw, teeth, palates, and tongue.  The Impulse comes from the Brain and your nervous system.

First, you have an impulse to communicate.  This can take the form of specific speech or something to be sung.  That impulse regulates the breath as it exits the lungs causing the vocal cords to vibrate.

The air passes between the vocal cords causing them to vibrate very quickly depending on the sounds you are trying to produce.  Impulses coordinate and send the signals for which pitches and patterns are to be created.  The pitch we are vibrating is not under our discrete control, it is operating on a meta-level.

The articulators also help with the crafting and specificity of sound. It is the articulators (again driven by impulse) that guide sound into a language as it travels out of our body.  Human beings are often thought of as the only animal that possesses discrete articulators though many animals can make specific sounds.


This Friday at 12:30 pm EDT, Gina will be live on FB. These will be short voice alignment sessions aimed at voice skills building. Watch it on the GROW Voice FB page. I hope to see you there.


Gina Razón is the principal voice specialist at GROW Voice LLC, a full-service voice and speech studio in Boston’s Back Bay.  She has over 16 years of experience both as a teacher of voice and speech, and a voraciously curious voice user.  Gina has worked professionally as a classical singer for over a decade and more recently as a professional public speaker.  For more information on the studio or to book Gina visit www.growvoice.com.

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