MEDICAL PHYSIOLOGY

Detailed explanation-1: -The posterior cricoarytenoid muscles are paired muscles that take origin from the central ridge on the back of the cricoid cartilage to insert into the muscular process of the arytenoid cartilage. They are the main abductors of the vocal folds.

Detailed explanation-2: -The muscles, lateral cricoarytenoid, thyroarytenoid, interarytenoid, and cricothyroid, all act together to adduct the vocal folds.

Detailed explanation-3: -Posterior cricoarytenoid-These are the only muscles involved in abduction. They open the glottis by pulling the back ends of the arytenoid cartilages together. This pulls the front ends (where the vocal folds attach) apart, therefore pulling the vocal folds apart.

Detailed explanation-4: -The cricoarytenoid joint is a complex synovial joint that allows rotation, abduction, adduction, and “gliding” movements. Impaired mobility of the vocal cord may be due to a paralysis or paresis but also secondary to trauma.

Detailed explanation-5: -Posterior cricoarytenoid muscle: extends from the cricoid cartilage and attaches to the muscular process of each arytenoid. These are the only muscle pair to cause abduction of the vocal folds.