In mammals, Sertoli cells occur in

Options

A. Germinal epithelium of testis
B. Germinal epithelium of ovary
C. Medulls of kidney
D. Adrenal cortex.

Answer

**Step-by-Step Solution:**

1. **Understanding Sertoli Cells**: Sertoli cells are somatic cells found in the male reproductive system. They play a crucial role in the development of sperm cells (spermatogenesis).

2. **Location of Sertoli Cells**: Sertoli cells are specifically located in the testes, where they surround and support developing sperm cells (spermatids).

3. **Options Analysis**:
- **Option A**: Germinal epithelium of testes - This is where Sertoli cells are found, as they are integral to the process of spermatogenesis.
- **Option B**: Germinal epithelium of ovaries - Sertoli cells are not found here; this is related to female gamete development.
- **Option C**: Medulla of kidney - This is part of the kidney structure and does not contain Sertoli cells.
- **Option D**: Adrenal cortex - This is part of the adrenal glands and unrelated to Sertoli cells.

4. **Conclusion**: Based on the information about Sertoli cells and the analysis of the options, the correct answer is **Option A: Germinal epithelium of testes**.