These figures show the movements of arytenoid vocal process upon phonation.
The pyramidal-shaped arytenoid cartilage sits on the upper surface of the cricoid cartilage on its supero-lateral aspect. It is a saddle synovial joint which allows arching movements along the transverse axis of the articular facet. The movement is better seen inferiorly by retrograde trans-tracheostomal or via a T-tube/fenestrated tracheostomy tube. Please note as the vocal folds adduct, the vocal processes move medially and slightly tilted downwards.
[White dot- tip of vocal process, yellow triangle- vocal process of arytenoid,
curve interrupted line-the medially rotated articular facet of the
cricoid cartilage medial edge].
Figure shows a glistening and markedly swollen left arytenoid mucosal oedema
in a patient presented with an acute globus sensation upon swallowing
associated with mild left-sided throat pain.
See video of Multiple Laryngeal Mucosal Swellings @ YouTube