Question

Which of the following statement is INCORRECT ?

• A. Superior colliculi are involved in visual reflexes.
• B. Inferior colliculi are relay centers for auditory reflexes.
• C. The corpora quadrigemina are four rounded elevations on the ventral surface of the mid brain.
• D. Superior colliculi and inferior colliculi together form corpora quadrigemina.

Hint:

The four lobes of the corpora quadrigemina lie on the dorsal surface of the midbrain, not the ventral surface.

Answer 1

The Correct Option is C

Step 1: Understanding the Concept
The dorsal part of the midbrain has four rounded lobes called corpora quadrigemina.

Step 2: Check the statements
Superior colliculi (upper pair) are centres of visual reflexes.
Inferior colliculi (lower pair) relay auditory reflexes.
Together the two pairs form the corpora quadrigemina.

Step 3: Find the error
These lobes lie on the dorsal surface. The ventral side of the midbrain has the cerebral peduncles.

Step 4: Conclusion
The statement placing them on the ventral surface is incorrect.

Final Answer:
The corpora quadrigemina are on the dorsal surface, so option (C) is incorrect. \[ \boxed{\text{(C) }\text{The corpora quadrigemina are four rounded elevations on the ventral surface of the mid brain.}} \]