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 solve the question, we need to identify the correct terms for the space within the coiled portion of the membranous labyrinth and the type of fluid it is filled with.

### Step-by-Step Solution:

1. **Understanding the Structure**: The membranous labyrinth is a complex structure within the inner ear, which includes various parts such as the cochlea, vestibule, and semicircular canals.

2. **Identifying the Coiled Portion**: The coiled portion of the membranous labyrinth refers specifically to the cochlea. Within the cochlea, there are several spaces.

3. **Naming the Spaces**: The main spaces within the cochlea are:
- Scala vestibuli
- Scala tympani
- Scala media (also known as the cochlear duct)

4. **Filling of the Spaces**:
- The scala vestibuli and scala tympani are filled with perilymph.
- The scala media (cochlear duct) is filled with endolymph.

5. **Final Answer**: Therefore, the space within the coiled portion of the membranous labyrinth is called **scala media**, and it is filled with **endolymph**.

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