The cochlea of ear contains

Options

A. perilymph
B. aqueous humour
C. perilymph and endolymph
D. only endolymph

Answer

**Step-by-Step Solution:**

1. **Understanding the Structure of the Ear:**
- The ear is divided into three main parts: the external ear, the middle ear, and the inner ear. The cochlea is located in the inner ear.

2. **Identifying the Components of the Cochlea:**
- The cochlea is a coiled structure that contains three main chambers: Scala Vestibuli, Scala Media, and Scala Tympani.

3. **Differentiating Between the Chambers:**
- The Scala Vestibuli and Scala Tympani are part of the bony labyrinth, while the Scala Media is part of the membranous labyrinth.

4. **Understanding the Fluids in the Cochlea:**
- The fluid in the Scala Vestibuli and Scala Tympani (bony labyrinth) is called perilymph.
- The fluid in the Scala Media (membranous labyrinth) is called endolymph.

5. **Eliminating Incorrect Options:**
- The question presents options that include perilymph, endolymph, and aqueous humor. Aqueous humor is related to the eye, not the ear, so it can be eliminated.
- The cochlea contains both perilymph and endolymph, thus options stating only one of these fluids are also incorrect.

6. **Conclusion:**
- The cochlea contains both perilymph and endolymph, making the correct answer the combination of both fluids present in the cochlea.

**Final Answer:**
The cochlea of the ear contains both perilymph and endolymph.

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