How to Read Mouth Diagrams for Vowels and Consonants

Decode mouth diagrams and IPA vowel charts: find the active articulator, read contact and airflow, predict the sound, then verify it by ear.

Scarlett Vale

FunFluen editor · Film and listening

Sep 3, 2026 10 min

That tongue drawing looks precise enough to perform surgery with. It isn’t. Most pronunciation diagrams are schematics asking you to notice one relationship—not portraits of the one correct human mouth.

First: know which kind of “mouth diagram” you have

A front-view mouth is especially limited because most of the tongue body and the velum are physically hidden from view. If the lesson wants you to infer those structures, it needs another diagram, label or explanation.

The whole article rests on one rule: a mouth diagram is a map, not a portrait.

Step 1: ORIENT the picture before reading the tongue

A common side-view pronunciation picture is a sagittal section: imagine looking at the vocal tract from the side after a vertical cut through the middle. Introductory linguistics resources use this view because it exposes structures that a normal front-facing photo cannot show. See Essentials of Linguistics: Articulators.

On a typical side-view diagram, identify these landmarks before worrying about the target sound:

• Front: lips and teeth.
• Just behind the upper teeth: the alveolar ridge.
• Farther back on the roof: the hard palate.
• Farther back still: the velum, or soft palate.
• Moving lower structure: tongue tip, blade/front, body/back and sometimes root.
• If shown lower in the throat: the glottis or vocal-fold area.

If you cannot tell which way is front, stop there. Reading the tongue before orienting the diagram is like using a street map upside down and blaming the street.

Step 2: FIND THE ACTIVE PART

For consonants, a useful first question is: which articulator is doing the moving?

The tongue tip may move toward the alveolar ridge. The tongue back may rise toward the velum. The lower lip may approach the upper teeth. Both lips may close. The moving structure is often called the active articulator; the structure it approaches is the passive articulator.

You do not need to memorize every anatomical label at once. Start with a pair:

active part → target area

Then read the distance between them.

Step 3: READ THE RELATION—touching, nearly touching, or open?

This is where a static drawing starts becoming pronunciation information.

In articulatory phonetics, complete closure is central to stop manner, while fricatives use a narrow constriction that creates turbulent airflow. A raised velum blocks access to the nasal cavity; lowering it permits nasal airflow. Essentials of Linguistics, 2nd edition illustrates these relations with midsagittal diagrams.

Step 4: PREDICT THE SOUND JOB for consonants

For a consonant, separate three questions:

1. Place: where is the main constriction?
2. Manner: how is the airflow constricted?
3. Voicing: are the vocal folds vibrating?

The official International Phonetic Association interactive chart makes this logic visible. Its pulmonic consonant chart uses place across columns and manner down rows. When two symbols share a cell, the symbol on the right is voiced and the one on the left is voiceless.

/t/ vs /k/: same broad manner and voicing, different place

On the official IPA chart, /t/ is a voiceless alveolar plosive; /k/ is a voiceless velar plosive. So if two side-view diagrams both show complete closure but one closure is at the alveolar ridge and the other is farther back at the velum, the useful difference is place.

/s/ vs /ʃ/: narrow constriction, different place

On the official IPA chart, /s/ is a voiceless alveolar fricative; /ʃ/ is a voiceless postalveolar fricative. A diagram for either should not look like a complete stop closure. Instead, look for a narrow constriction, then ask where it is located.

/p/ vs /b/: the mouth picture alone may not be enough

/p/ and /b/ are both bilabial plosives: the lips close. On the official IPA chart they occupy the same place/manner cell; /p/ is on the left because it is voiceless, /b/ on the right because it is voiced.

That gives you a powerful diagram-reading lesson: closed lips do not prove /p/. If a side-view picture shows only the lips and no voicing label or glottal information, /p/ versus /b/ may be impossible to infer from the picture alone.

How to read the IPA vowel chart without putting your tongue inside a trapezoid

Vowels use a different map because there is usually no complete oral closure to point at.

On the official IPA vowel chart:

• Left to right: Front → Central → Back.
• Top to bottom: Close → Close-mid → Open-mid → Open.
• Paired symbols: where two vowel symbols appear as a pair, the symbol on the right represents a rounded vowel.

These labels give you relative vowel-quality dimensions. They do not mean that the printed distance between two symbols is an exact number of millimetres inside your mouth.

Phonetician Geoff Lindsey has specifically criticized the conventional IPA vowel quadrilateral for implying articulatory geometry and equidistance that are not literally true. That is a useful warning for learners: use the chart to compare reference qualities, not as a blueprint for exact tongue coordinates. See Charting the vowel space.

A practical vowel-chart read

If one symbol is higher and more front than another, predict a relatively closer/higher and more front vowel quality. If a paired symbol is on the right, predict rounding in the official IPA convention. Then listen.

The chart is strongest when it gives you a direction of comparison: higher/lower, fronter/backer, rounded/unrounded—not when you try to sculpt one universal frozen tongue shape.

Actual articulation also varies. A phonetics study of French nasal vowels found inter-speaker and inter-dialect differences in oral articulation. That study is narrow—it is not a survey of every vowel in every language—but it reinforces the larger caution: a pedagogical mouth picture is not proof that every speaker uses identical geometry. See Oral articulation of nasal vowels in French.

Shading, arrows and bigger drawings: check the legend

Visual conventions are not universal.

There is one important standardized exception worth knowing: on the official IPA pulmonic consonant chart, shaded cells mean articulations judged impossible. The shading does not mean “stronger sound” or “more pressure.”

But in a separate textbook mouth drawing, a grey patch might mark contact, a target region or simply visual emphasis. An arrow might mean airflow, movement or direction of attention. Check the legend before you give the graphics a phonetic meaning.

Don’t Read This Into the Picture

If you checked anything, the repair is the same: ask what variable the visual explicitly encodes. A bigger cartoon mouth is not a volume knob.

Mouth Diagram Lab: what can you actually infer?

Decide first: CAN INFER, CANNOT INFER, or NEED THE LEGEND. Then open the reasoning.

Use natural language to describe what the diagram shows

Being able to explain a diagram aloud is a good check that you actually understood it.

• “The tongue touches to the alveolar ridge.” — Wrong. A listener will probably understand the intended meaning, but touch normally takes its object directly. Natural: “The tongue touches the alveolar ridge.”
• “The tongue is more back.” — Unusual/non-idiomatic in ordinary learner description. Natural: “The tongue is farther back” or, in more technical phonetic language, “the tongue is more retracted.”

Step 5: VERIFY—because a visual prediction is not the sound

Once you have decoded the picture, stop staring at it.

1. Hear: listen to a reliable model of the target sound or word.
2. Produce: use the diagram’s relationship as a setup cue, not a demand for exact geometry.
3. Compare: ask whether the sound contrast you predicted is actually audible and repeatable.

The official Interactive IPA Chart itself lets you click IPA symbols and hear reference recordings. That is a useful final reminder: the chart is meant to connect symbols and phonetic descriptions to sounds, not to trap you inside a drawing.

Where FunFluen can help

After you have decoded a mouth diagram, the next useful step is auditory verification. On supported video pages, FunFluen can help you repeat a line, move by sentence, or compare what you heard with subtitle support. Pronunciation playback can also provide a model/browser-voice aid in supported contexts.

FunFluen does not image your tongue, measure contact pressure, show your velum, measure airflow or certify that your mouth matches a diagram.

Review the FunFluen extension listing if you want to pair diagram decoding with repeated listening to the target sound on supported video pages.

Read the map, then listen to the territory

The next time a pronunciation lesson gives you a mysterious tongue drawing, do not start by copying the tongue.

Orient the visual. Find the active part. Read its relation to the target. Predict the articulatory job. Then verify with sound.

A good mouth diagram is a compact map of a relationship. It is not a portrait you have to impersonate.

Sources

• International Phonetic Association: Interactive IPA Chart
• Essentials of Linguistics: Articulators
• Essentials of Linguistics, 2nd edition: Describing consonants—Manner
• Charting the vowel space
• Oral articulation of nasal vowels in French

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