Brain of a Bird
In birds the hemispheres are not united as in humans; the cerebellum is proportionately larger than the medulla oblongata, and the comparative weight of the brain to the body is less than in mammals. Labels: 1, Cerebrum. 2, Optic ganglion. 3, Cerebellum. 4, Medulla oblongata.
Cutter, Calvin First Book on Analytic Anatomy, Physiology and Hygiene, Human and Comparative (Philadelphia: J. B. Lippincott & Co., 1875) 150