From the secculus arises a narrow tube called

Options

A. Ductus endolymphaticus
B. Endolymphatic sac
C. Cochlea
D. None of the above

Answer

**Step-by-Step Solution:**

1. **Identify the Structure**: The question asks about a narrow tube that arises from the saccule. The saccule is a part of the inner ear, specifically within the membranous labyrinth.

2. **Recognize the Tube**: The narrow tube that arises from the saccule is known as the "ductus endolymphaticus." This term can also be referred to as the endolymphatic duct.

3. **Location of the Ductus Endolymphaticus**: The ductus endolymphaticus originates from the posterior wall of the saccule.

4. **Connection to Other Structures**: This duct connects to the utriculo-saccular duct, indicating its role in the inner ear's fluid dynamics.

5. **Function of the Ductus Endolymphaticus**: The primary function of this duct is to maintain the flow of endolymph, which is crucial for the proper functioning of the inner ear. Additionally, it helps block the entry of pathogens into the inner ear.

6. **Select the Correct Answer**: Based on the information provided, the correct answer to the question is "ductus endolymphaticus."

**Final Answer**: The narrow tube that arises from the saccule is called the **ductus endolymphaticus**.

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