In human male testes , the regions outside the seminiferous tubules are called interstitial speces, and they contain

Options

A. Immunologically competent cells
B. Leydig cells
C. Sertoli cells
D. Both (A) & (B)

Answer

To solve the question regarding what is contained in the interstitial spaces of human male testes, we can break it down step by step:

### Step-by-Step Solution:

1. **Understanding the Structure**: The testes are composed of seminiferous tubules where sperm production occurs. The regions outside these tubules are referred to as interstitial spaces.

2. **Identifying Contents of Interstitial Spaces**: The interstitial spaces contain various types of cells and substances that play a role in testicular function.

3. **Evaluating the Options**:
- **Option A: Immunologically competent cells**: These cells include lymphocytes, macrophages, and mast cells which are involved in immune responses. While they may be present, they are not the primary components of interstitial spaces.
- **Option B: Leydig cells**: These are specialized cells located in the interstitial spaces and are responsible for producing testosterone, a key hormone in male reproductive function. This option is correct.
- **Option C: Sertoli cells**: These cells are found within the seminiferous tubules and are responsible for supporting and nourishing developing sperm cells. They are not located in the interstitial spaces, making this option incorrect.
- **Option D: Both A and B**: This option suggests that both immunologically competent cells and Leydig cells are present in the interstitial spaces. While Leydig cells are present, the presence of immunologically competent cells is not definitive.

4. **Conclusion**: The most accurate answer is that the interstitial spaces primarily contain Leydig cells, which are crucial for testosterone production. Therefore, the best answer to the question is **Option B: Leydig cells**.

### Final Answer:
The interstitial spaces in human male testes contain **Leydig cells**.

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