1.Optic chiasm 2.Describe where the structure is (hindbrain,midbrain,forebrain,at the level of which ventricle) 3.Describe the function of the brain structure. 4.Find this structure in 3 different species... One must be human. Provide pictures. 5 Describe the differences between the three species(shape,size compared to rest of brain) Respond in terms of ratio.