What are stereocilla ?

Explanation

**Step-by-Step Text Solution:**

1. **Definition of Stereocilia**: Stereocilia are specialized cellular structures that are classified as non-motile evaginations. This means they protrude from the cell membrane but do not have the ability to move actively like cilia or flagella.

2. **Location of Stereocilia**: These structures are primarily found in specific areas of the body, including the epididymis (a part of the male reproductive system) and the vas deferens (the duct that conveys sperm from the testicle to the urethra). They are also present in the lining of the ear.

3. **Structure and Function**: Stereocilia are embedded in the cell membrane and remain relatively stationary. Their primary function is to respond to fluid movement. When there is a flow of fluid, stereocilia can slightly move or bend, which helps in providing direction to the fluid movement.

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