The brain stem lies between the cerebral hemispheres above and the spinal cord at the foramen magnum. It consists of the midbrain (cerebral peduncles ventrally and tectum dorsally), the pons, and the medulla oblongata. The pons extends to the cerebellar peduncles on either side, attaching the cerebellum dorsal to the brain stem.
In the dorsal view, the pineal gland is seen above the colliculi of the midbrain tectum. Between the cerebellar peduncles is the diamond-shaped fossa of the fourth ventricle on the dorsal side of the pons and upper medulla.
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