What is the role of three semicircular canals in ear ?

Explanation

### Step-by-Step Solution:

1. **Location and Structure**: The three semicircular canals are located in the inner ear and are directly connected to the cochlea. They are shaped like a "C" and are fluid-filled structures.

2. **Types of Canals**: There are three types of semicircular canals: the superior canal, the posterior canal, and the horizontal canal. The superior and posterior canals are oriented diagonally in vertical planes, while all three canals are positioned at right angles (90 degrees) to each other.

3. **Function as Sensory Receptors**: The semicircular canals contain structures known as crista ampullaris, which act as sensory receptors. These receptors are responsible for detecting changes in the position of the head.

...