To better understand laryngitis, it helps to understand the anatomy of the larynx.
The larynx is part of the upper airway. It begins at the lower pharynx, and extends down to the trachea.
Functions of the larynx include:
- Maintain an open airway
- Produce the voice
- Protect the lungs
The larynx consists of:
- Klassen TP. Recent advances in the treatment of bronchiolitis and laryngitis. Pediatr Clin North Am. 1997 Feb;44(1):249-61. 
- Noordzij JP, Khidr A, Evans BA, Desper E, Mittal RK, Reibel JF, Levine PA. Evaluation of omeprazole in the treatment of reflux laryngitis: a prospective, placebo-controlled, randomized, double-blind study. Laryngoscope. 2001 Dec;111(12):2147-51. 
- Reveiz L, Cardona AF, Ospina EG. Antibiotics for acute laryngitis in adults. Cochrane Database Syst Rev. 2005 Jan 25;(1):CD004783. 
- Vaezi MF. Laryngitis and gastroesophageal reflux disease: increasing prevalence or poor diagnostic tests? Am J Gastroenterol. 2004 May;99(5):786-8.