The 'cricothyroid muscle' attaches to the anterolateral aspect of the
cricoid and the inferior
cornu and lower
lamina of the
thyroid cartilage, tilting the thyroid forwards and tensing the
vocal cords. It is the only
laryngeal muscle supplied by the
external laryngeal nerve (rather than the
recurrent laryngeal nerve).
Action
The Cricothyreoidei produce tension and elongation of the vocal folds by drawing up the arch of the cricoid cartilage and tilting back the upper border of its lamina; the distance between the vocal processes and the angle of the thyroid is thus increased, and the folds are consequently elongated.
Innervation
This muscle is innervated by the external laryngeal branch of the vagus nerve.
Additional images
See also
★
Cricothyroid ligament
External links
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