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What is larynx?

Larynx is a hollow organ at the beginnig of the lungs includes vocal cords. It has three main functions: Passage of air, protection of the lower airways, production of voice.
It is composed of cartilage as a main structure and connects the vocal cords to the lower airways. 

It prevents foreign materials pass to lower airways. For this protection anatomic structure should be intact, sensory innervation and muscle functions should be normal. While swallowing a structure composed of cartilage called “epiglottis” closes the larynx and prevents foods and saliva to enter the larynx. Foods are directed to esophagus. 

Voice production is a complex function of larynx. Vocal cords vibrate to produce voice. Air comes from lungs. Length and thickness of the vocal cords effect the pitch of the voice. Any problem or change in these factors effect the voice.

My persistent symptoms 31 May, 2013 - 12:14

I am writing to you from St. John's, Newfoundland (Canada). I have a sinus problem started in Nov 2008 upon working for more than a month in a gas plant. I did not have sinus problems prior to this date.

At that time, I may have been exposed to airborne asbestos and other irritants. In the place where I lived at that time, the Winter is so harsh. Temperature during Winter is normally at least 25 Cecilius below zero.

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