MID BRAIN -
Optics lobes 4 in number (Corpora Quadrizemmini) in frog corpora bizemmini.
Solid, optocoel is absent. 2 superior coculi and 2 inferior coculi are present.
Attached to each other by crura cerebri.
Superior coculli are concerned with sense of sight. Inferior coculi are concerned with hearing.
Note :- Brain with large optic lobes is avian brain.