Question

The structures present in the seminiferous tubule of testis are:
A. Spermatogonial cells
B. Spermatids
C. Spermatozoa
D. Leydig cells
E. Sertoli cells
Choose the correct answer from the options given below:

• A. A, B, C and E only
• B. A, B, D and E only
• C. A, C, D and E only
• D. A, B, C and D only

Hint:

Think of the seminiferous tubule as an enclosed tube: everything involved in direct sperm support and development (Sertoli cells + germ cells) is inside, while the hormone-producing Leydig cells are situated outside in the interstitial spaces.

Answer 1

The Correct Option is A

Step 1: Understanding the Concept:
The parenchyma of the testis is divided into the seminiferous tubules (where sperm are produced) and the surrounding interstitial tissue (which contains endocrine and supportive cells).

Step 2: Detailed Explanation:
Let us analyze where each cell type is located within the testicular tissue:
- Spermatogonial cells (A), spermatids (B), and mature spermatozoa (C) represent different development stages of the spermatogenic lineage, all of which are located directly inside the germinal epithelium lining the seminiferous tubules.
- Sertoli cells (E) are large, supporting "nurse" cells that are also located inside the seminiferous tubules, providing structural and metabolic support to the developing sperm.
- Leydig cells (D), also known as interstitial cells, are located outside the seminiferous tubules, within the loose connective tissue of the interstitium. They produce testosterone in response to luteinizing hormone.
Therefore, the structures present *within* the seminiferous tubules are A, B, C, and E only.

Step 3: Final Answer
The correct option is (A).