Intrinsic Muscles of the Larynx Flashcards
Cricothyroid muscle is innervated by which nerve
External branch of SLN
Action of cricothyroid muscle
Tension and elongation of vocal cords to determine pitch
Innervation of all intrinsic muscles of the larynx are innervated by the RLN except which muscle?
Cricothyroid muscle - done by external branch of SLN
What muscles are responsible for relaxing the vocal cords?
Vocalis and thyroarytenoid muscles
Action of vocalis muscle
Relaxation of vocal cords
Action of thyroarytenoid muscle
Relxation of vocal cords
What muscles are responsible for adduction of vocal cords?
Lateral cricoarytenoids, oblique & transverse arytenoids
Action of posterior cricoarytenoid muscle
abduction of vocal cords - opening of glottis
Action of transverse arytenoid muslces
Adduction of vocal cords - closure of the glottis
Action of the oblique arytenoid muscles
Adduction of vocal cords, closure of glottis, approximates fold to close inlet
Action of aryepiglottic muscle
Closure of laryngeal inlet
Action of thyroepiglottic muscle
Opening of laryngeal inlet
What muscles are responsible for closure of the laryngeal inlet?
Aryepiglottic and oblique arytenoid muscles
What muscles are responsible for vocal ligament abduction
posterior cricoarytenoid
What muscles is responsible for opening of the laryngeal inlet?
Thyroepiglottic muscle
