Secretion of the androgen by Leydig cells of testis is under the regulatory influence of

Options

A. STH
B. FSH
C. ACTH
D. ICSH

Answer

To solve the question regarding the regulatory influence on the secretion of androgens by Leydig cells of the testis, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Role of Leydig Cells**:
- Leydig cells, located in the testes, are responsible for the production of androgens, primarily testosterone.

2. **Identify Hormonal Regulation**:
- The secretion of androgens is regulated by hormones released from the pituitary gland.

3. **Review the Options Provided**:
- The options given are STH (Somatotropic Hormone), FSH (Follicle Stimulating Hormone), ACTH (Adrenocorticotropic Hormone), and ICSH (Interstitial Cell Stimulating Hormone).

4. **Eliminate Incorrect Options**:
- STH primarily influences growth and metabolism, not androgen secretion.
- FSH is mainly involved in spermatogenesis and does not directly stimulate Leydig cells.
- ACTH primarily stimulates the adrenal cortex and is not directly involved in the regulation of Leydig cells.

5. **Identify the Correct Hormone**:
- ICSH, also known as Luteinizing Hormone (LH), specifically stimulates Leydig cells to produce testosterone.

6. **Conclude the Answer**:
- Therefore, the secretion of androgens by Leydig cells is under the regulatory influence of ICSH (Interstitial Cell Stimulating Hormone).

### Final Answer:
The secretion of androgen by Leydig cells of the testis is under the regulatory influence of ICSH (Interstitial Cell Stimulating Hormone).

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