Sperms undergo maturation in the upper and middle regions of epididymis and get stored in the hind region. What kind of changes of sperms occurs in different regions of epididymis?

Explanation

### Step-by-Step Solution:

1. **Understanding the Epididymis**:
- The epididymis is an extra-testicular duct that is crucial for the maturation and storage of sperm. It consists of three main regions: the head (upper region), body (middle region), and tail (hind region).

2. **Initial Condition of Sperm**:
- Before entering the epididymis, sperm are immotile and surrounded by a high concentration of fluid. They rely on ciliary movement to reach the epididymis.

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