Vocalis

Origin, Insertion, Action & Nerve

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.

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)

OIANS stands for Origin, Insertion, Action and Nerve, the four facts that uniquely define every skeletal muscle. To learn the Vocalis, work through them in order: picture its origin, trace the muscle to its insertion, reason out the action that shortening between those two points must create, then add the nerve that drives it.

Most students remember the Vocalis fastest by linking its action back to its attachments rather than memorising each fact in isolation. Once the origin and insertion make sense, the action usually follows logically.

Vocalis quick facts

Region

Head & Neck

Group

Larynx

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)

Spinal roots

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Frequently asked questions

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