Vocalis
Larynx · Head & Neck
The vocalis is the fine, medial part of the thyroarytenoid that lies within the vocal fold itself, closely applied to the vocal ligament. It arises from the inner surface of the thyroid lamina near the angle and inserts onto the vocal process and vocal ligament of the arytenoid cartilage. Rather than moving the folds as a whole, it makes precise, segmental adjustments to their tension, shortening and relaxing selected portions to control pitch and timbre during phonation. It is innervated by the recurrent laryngeal nerve (vagus, CN X). This delicate tuning role makes it essential to the subtle pitch changes of singing and speech.
Origin, Insertion, Action & Nerve
Origin
Inner surface of the thyroid lamina near the angle
Insertion
Vocal process and vocal ligament of the arytenoid cartilage
Action
Finely adjusts tension of individual vocal folds (shortens and relaxes) for pitch control
Nerve
Recurrent laryngeal nerve (vagus, CN X)
Attachments explained
The Vocalis is defined first by where it attaches. Its origin is the more fixed anchor, usually the proximal or more stable end that stays put during contraction, while its insertion is the more mobile point that is pulled toward the origin when the muscle shortens.
Origin
Inner surface of the thyroid lamina near the angle
Insertion
Vocal process and vocal ligament of the arytenoid cartilage
Action & function
When the Vocalis contracts, it produces the following movement: Finely adjusts tension of individual vocal folds (shortens and relaxes) for pitch control.
As part of the Larynx group of the Head & Neck, it works alongside neighbouring muscles to generate smooth, coordinated movement and to stabilise the structures it acts on.
Nerve supply & clinical relevance
The Vocalis receives its nerve supply from the Recurrent laryngeal nerve (vagus, CN X).
Because a muscle can only contract when its nerve is intact, injury to the Recurrent laryngeal nerve can weaken or paralyse the Vocalis, impairing the movements it normally produces (finely adjusts tension of individual vocal folds (shortens and relaxes) for pitch control). This is why knowing the innervation is central to localising nerve lesions in clinical practice.
How to study the Vocalis (the OIANS method)
Study vocalis as the muscle buried inside the vocal fold, hugging the vocal ligament between the thyroid angle and the arytenoid's vocal process. Because it lies within the fold itself, think of it as the fine tuner that adjusts tension in parts of the fold rather than swinging the whole structure, which explains its role in pitch and quality of voice.
Contrast it with cricothyroid to avoid confusion over pitch control: cricothyroid lengthens the whole fold from outside to raise pitch, whereas vocalis shortens and relaxes segments from within for precise adjustment. Keep it under the recurrent laryngeal nerve like the rest of the intrinsic muscles except cricothyroid, and pair it in your mind with the thyroarytenoid it belongs to.
Frequently asked questions
Where is the Vocalis located?
The Vocalis is a muscle of the Larynx group, located in the Head & Neck.
What is the origin of the Vocalis?
Inner surface of the thyroid lamina near the angle
What is the insertion of the Vocalis?
Vocal process and vocal ligament of the arytenoid cartilage
What movements does the Vocalis produce?
Finely adjusts tension of individual vocal folds (shortens and relaxes) for pitch control
What nerve supplies the Vocalis?
Recurrent laryngeal nerve (vagus, CN X)
Is the Vocalis free to study in OIANS?
The Vocalis is always free to browse. Its full origin, insertion, action and nerve details are open to everyone in the Muscle Directory. Quiz and Flashcard practice for the Head & Neck is part of the one-time Lifetime upgrade, though; only the Upper Limb decks are free to test yourself on.
Related muscles
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