The number of lobes present on dorsal surface of midbrain mainly are

The number of lobes present on dorsal surface of midbrain mainly are four.

The dorsal surface of the midbrain typically consists of two main lobes or colliculi, not four. These are known as the superior colliculi and the inferior colliculi.

• Superior colliculi: There are two superior colliculi on the dorsal surface of the midbrain. They are involved in visual processing and play a role in directing eye movements and visual attention.
• Inferior colliculi: Similarly, there are two inferior colliculi on the dorsal surface of the midbrain. They are a part of the auditory system and play a crucial role in processing auditory information, including sound localisation and auditory reflexes.