Musculus thyreoarytaenoideus internus is a term used in anatomy to denote a small muscle present in the larynx. The spelling of this word can be tricky to understand, but it can be explained through the use of the International Phonetic Alphabet (IPA) phonetic transcription. The word can be broken down into syllables: mus-cu-lus thy-re-o-ar-ye-nai-de-us in-ter-nus. The pronunciation of each syllable can be represented using IPA symbols. By mastering the IPA, understanding and spelling complex scientific terms like this one is easier.
Musculus thyreoarytaenoideus internus, also known as the internal thyroarytenoid muscle, is a small band of muscle located within the throat or larynx. It is part of the larger thyroarytenoid muscle group and is found deep within the vocal folds, which are responsible for producing sound during speech or singing.
The musculus thyreoarytaenoideus internus runs between the thyroid cartilage, at the front of the throat, and the arytenoid cartilages, which are located at the back of the larynx. This muscle plays a key role in the production and control of vocal sound.
When the musculus thyreoarytaenoideus internus contracts, it brings the arytenoid cartilages closer to the thyroid cartilage, causing the vocal folds to tense and tighten. This results in a higher pitch and increased vocal tension. In contrast, when the muscle relaxes, the vocal folds become looser, allowing for a lower pitch and decreased tension.
Overall, the musculus thyreoarytaenoideus internus is vital for vocalization and sound production. It works in conjunction with other muscles in the larynx to fine-tune pitch and tension, enabling an individual to communicate through speech or singing.
M. vocalis.
A practical medical dictionary. By Stedman, Thomas Lathrop. Published 1920.