Tetanus (or lockjaw) is a serious infection caused by Clostridium tetani bacteria which produce a toxin that affects the brain and nervous system. The toxin leads to stiffness in the jaw muscles as well as other muscles.
The function of the epiglottis is that it allows air to pass through the larynx and into the rest of the respiratory system. When swallowing food or drink, it covers the entrance to the larynx to prevent food and drink from entering the trachea (windpipe).
The epiglottis is a flap made of elastic cartilage tissue covered with a mucous membrane, attached to the entrance of the larynx. It projects obliquely upwards behind the tongue and the hyoid bone, pointing dorsally. It stands open during breathing, allowing air into the larynx.