The space within the coiled portion of the membranous labyrinth is called ……...
Which is filled with ……….

Options

A. Scala vestibuli , perilymph
B. Scala tympani , perilymph
C. Scala vestibuli , endolymph
D. Scala media , endolymph

Answer

To answer the question, we need to identify the space within the coiled portion of the membranous labyrinth and the fluid that fills it.

### Step-by-Step Solution:

1. **Understanding the Structure of the Ear**:
- The ear is divided into three main parts: the outer ear, middle ear, and inner ear. The inner ear contains the cochlea, which is a coiled structure.

2. **Identifying the Membranous Labyrinth**:
- The inner ear consists of two types of labyrinths: the bony labyrinth and the membranous labyrinth. The membranous labyrinth is a series of fluid-filled sacs and ducts.

3. **Focusing on the Cochlea**:
- The cochlea is the coiled portion of the membranous labyrinth. It plays a crucial role in hearing.

4. **Determining the Space Within the Cochlea**:
- Within the cochlea, there are different chambers. The specific space we are looking for is called the **scala media**.

5. **Identifying the Fluid in the Scala Media**:
- The scala media is filled with a specific fluid known as **endolymph**. This fluid is essential for the function of the cochlea in the auditory process.

### Final Answer:
The space within the coiled portion of the membranous labyrinth is called **scala media**, which is filled with **endolymph**.

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