key term - Eustachian tube

Definition

The eustachian tube is a narrow canal that connects the middle ear to the nasopharynx. It helps to equalize air pressure on both sides of the eardrum.

5 Must Know Facts For Your Next Test

1. The eustachian tube plays a crucial role in ventilating the middle ear and maintaining pressure equilibrium.
2. Infections can cause inflammation of the eustachian tube, leading to conditions such as otitis media.
3. The tube is normally closed but opens during activities like swallowing or yawning.
4. Bacteria from the nasopharynx can travel through the eustachian tube to the middle ear, causing infections.
5. The length and angle of the eustachian tube change with age, affecting susceptibility to ear infections.

Review Questions

Related terms

Nasopharynx:

The upper part of the pharynx, connecting with the nasal cavity above the soft palate.

Otitis Media: An infection or inflammation of the middle ear.

Middle Ear: The air-filled central cavity of the ear, behind the eardrum.