Table I.

Morrison-Rammage classification of muscle tension dysphonia ¹⁰.

MTD
Type 1	The laryngeal isometric	Isometric contraction of the larynx associated with posterior adductor deficit
Type 2	Lateral hyperadduction state: supra-glottic	Supra-glottic contraction with adduction in the midline
Type 3	Supraglottic antero-posterior contraction	Anteroposterior contraction at supraglottic level with reduced space between epiglottis and arytenoids
Type 4	Squeeze	Extreme anteroposterior contraction of the larynx