Which of the following statements is incorrect ?

Options

A. Sympathetic neural system controls and coordinates organs which are under voluntary control
B. Deficiency of vitamin A can causes night blindness
C. Malleus is the largest ear ossicle
D. Cranial nerve IX is a mixed nerve

Explanation

To determine which statement is incorrect, we will analyze each of the provided statements one by one.

1. **Sympathetic neural system controls and coordinates organs which are under voluntary control.**
- The sympathetic nervous system is part of the autonomic nervous system, which primarily regulates involuntary functions. It does not control voluntary muscles or organs. Therefore, this statement is incorrect.

2. **Deficiency of vitamin A can cause night blindness.**
- This statement is true. Vitamin A is essential for the production of rhodopsin, a pigment in the retina that is necessary for low-light vision. A deficiency can lead to night blindness.

3. **Malleus is the largest ear ossicle.**
- This statement is true. The malleus (or hammer) is indeed the largest of the three ear ossicles, which also include the incus (anvil) and stapes (stirrup).

4. **Cranial nerve which is 9 is a mixed nerve.**
- This statement is true. Cranial nerve IX, known as the glossopharyngeal nerve, is a mixed nerve, meaning it has both sensory and motor functions.

Based on the analysis above, the incorrect statement is:

**Answer: Option 1 - Sympathetic neural system controls and coordinates organs which are under voluntary control.**