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The Anatomy of the Sheep Brain Anatomically, the human brain shares many basic structures and brain areas with the brains of other animals. For example, in the sheep brain (see Image below), one observes a cerebrum, a brain stem, cerebellum, medulla oblongata and glands, such as the pineal gland and the pituitary gland. Like the human brain it's surface is also thrown into many convolusions, called gyri and fissures. In variation to the human brain, however, the sheep brain possesses a rather large olfactory bulb, a pronounced optic nerve (CN II) and a large optic chiasma. Cerebral peduncles are found on the ventral aspect of the midbrain, posterior to the single mammilary body. The same number of cranial nerves as observed in the human brain, which is 12, emerge from the base of the sheep brain. Internally, the sheep brain reveals a thalamus, a corpus callosum, four ventricles, i.e. 2 lateral, one third and one fourth ventricle, a hypothalamus, a pineal gland, the corpora quadrigemina of the midbrain, the pineal gland, the pons and the medulla oblongata. The inner anatomy of a sheep brain