Posterior Cricoarytenoid Muscle

Posterior Cricoarytenoid Muscle

Question 1. Name the safety muscle of larynx and give the reason why it is so named.
Answer.

The posterior cricoarytenoid is a safety muscle of larynx.

It is so named because it is the only intrinsic muscle of larynx, which abducts the vocal cords to allow the entry of air into the LRT. All the other intrinsic muscles of larynx adduct the vocal cords and restrict the entry of air into the LRT.

Question 2. What are the boundaries of laryngeal inlet?
Answer.

• Anterior: Epiglottis
• On each side: Aryepiglottic fold
• Posterior: Interarytenoid fold