Give the function of sertoli cells.

Explanation

**Step-by-Step Solution:**

1. **Definition of Sertoli Cells**: Sertoli cells are somatic cells located in the seminiferous tubules of the testes. They play a crucial role in the male reproductive system.

2. **Role in Spermatogenesis**: Sertoli cells are essential for the process of spermatogenesis, which is the formation of sperm cells (spermatozoa) from spermatogonia.

3. **Nutritional Support**: Sertoli cells provide nutritional support to developing sperm cells (spermatids). They surround the spermatids and help in their growth and maturation by supplying necessary nutrients.

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