B. Posterior cricoarytenoid.
D. Lateral cricoarytenoid.
The nerve marked by an arrow near the thyroid is recurrent laryngeal nerve.
Adductor of vocal cords
- R and L muscles; attached to thyroid and arytenoid cartilages on each side.
- Action shortens and relaxes vocal ligament.
Note: deeper inner fibers referred to as “vocalis muscle”.
Lateral cricoarytenoid muscle: (R and L muscles):
- Attached to cricoid and arytenoid cartilage on each side.
- Closes or adducts vocal folds.
- Supplied by Recurrent laryngeal nerve.
- Attached to cricoid and thyroid cartilages.
- Tilts the thyroid cartilage, thus increasing tension of vocal folds
- Supplied by external laryngeal nerve
Inter-arytenoid muscle (transverse and oblique)
- Attached between right and left arytenoid cartilages
- Closes inlet of larynx
- Supplied by Recurrent laryngeal nerve Abductor of vocal cords
Posterior cricoarytenoid muscle
- Attached to cricoid and arytenoid cartilages
- Move arytenoid cartilages so as to move both vocal folds apart, “open” of abduct vocal folds
- Supplied by Recurrent laryngeal nerve
Vocalis muscle (derived from inner and deeper fibers of thyroarytenoid msucle)
Supplied by Recurrent laryngeal nerve
All intrinsic muscles of the larynx are supplied by the recurrent laryngeal nerve except for cricothyroid which is supplied by external laryngeal nerve.