glottalic consonant

When glottalic consonants of different types are present in a language, they tend to form a single phonological class.

On Glottalic Consonants.

"Phonetic differences in glottalic consonants."

In very many languages that have glottalic consonants, there is a constraint against two such consonants in the same root.

See glottalic consonants and click consonants for more information on the distribution of nonpulmonic consonants.

Hausa has glottalic consonants (implosives and ejectives) at four or five places of articulation (depending on the dialect).

Note that the latter two sounds are not all that different, as both are voiced palatal sounds, and both are types of glottalic consonants.

It may be that the glottalic consonants were preglottalized, or that they were ejectives that became preglottalized in Italic and Balto-Slavic before losing their glottalization and becoming voiced.

The larynx also has a similar function as the lungs in creating pressure differences required for sound production; a constricted larynx can be raised or lowered affecting the volume of the oral cavity as necessary in glottalic consonants.