How many primary fillicles are left in each ovary at puberty ?

Answer

To answer the question of how many primary follicles are left in each ovary at puberty, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Primary Follicles**:
- A primary follicle is defined as a follicle that has developed two layers of follicular cells surrounding the oocyte. These cells are crucial for the development of the oocyte.

2. **Formation of Primary Follicles**:
- During fetal development, there are approximately one million follicles that undergo division to form primary follicles in the ovaries.

3. **Degeneration of Follicles**:
- It is important to note that not all of these follicles will survive. Many primary follicles undergo a process known as atresia, which is the degeneration of ovarian follicles.

4. **Count at Puberty**:
- By the time a female reaches puberty, the number of primary follicles left in each ovary significantly decreases due to this degeneration. Research indicates that there are approximately 60,000 to 80,000 primary follicles remaining in each ovary at this stage.

5. **Final Answer**:
- Therefore, at puberty, each ovary contains about **60,000 to 80,000 primary follicles**.