Ear

2.0 years: First pair of adult teeth are full-grown.

20.4 Ear The ear is divided into 3 parts:

1. The outer ear consists of the part of the ear seen, on the outside of the head, as well as the opening into the ear itself.

2. The middle ear consists of a membrane, called the “ear drum”, which vibrates when sound comes to it, and tiny little bones which are connected to the ear drum. The middle ear is also connected to the throat by a small duct.

3. The inner ear consists of the inside part which is directly connected to the brain.