Describe the structure of parathyroid glands in short.

Explanation

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

1. **Definition and Location**: The parathyroid glands are small endocrine glands that play a crucial role in regulating calcium levels in the body. There are typically four parathyroid glands located behind the thyroid gland.

2. **Number of Glands**: There are four parathyroid glands, which are small in size and are situated in pairs on each side of the thyroid gland.

3. **Structure**: The parathyroid glands are tiny, round structures. They are embedded in the posterior surface of the thyroid gland, which means they are located at the back of the thyroid.

...