Brain

===The brain is an organ of soft nervous tissue contained in the skull of vertebrates, functioning as coordinating center of sensation and intellectual and nervous activity. Cerebrum is the principal and most anterior part of the brain in vertebrates, located in the front area of the skull and consisting of two hemispheres, left and right, separated by a fissure. It is responsible for integration of complex sensory and neural functions and the initiation and coordination of voluntary activity in the body. Thalamus is either of two masses of gray matter lying between the cerebral hemispheres of either side of the third ventricle, relaying sensory information and acting as center of pain perception. Hypothalamus is below the thalamus coordinates both autonomic nervous system and activity of the pituitary, controlling body temperature, thirst, hunger, and other homeostatic systems, and involved in emotinal activity and sleeping. Pineal gland is a small endocrine in the brain, situated beneath the back part of the corpus callosum, secretes Melatonin. Pituitary gland is the master gland of the endocrine system, it's located at the base of the brain, it's secretions control other endocrine glands and influence growth, metabolism, and maturation. Cerebellum is part of the brain at the back of the skull in vertebrates, it's function is to coordinate and regulate muscle activity. Brain stem is part of the brain continuous with the spinal cord and comprising the medulla oblongata and pons. Neurons within the brain stem control basic functions such as heart rate and breathing. Spinal cord is a cylindrical bundle of nerve fibers and associated tissue that is enclosed in the spine and connects nearly all parts of the body to the central nervous system. Corpus callosum is a broad band of nerve fiber joining two hemispheres of the brain. Hippocampus is elongated ridges on the floor of each lateral ventricle of the brain, thought to be the center of emotion, memory, and autonomic nervous system. Midbrain is a short part of the brainstem just rostral to the pons. Contains nerve pathways between the cerebral hemisphere and medulla oblongata. Center for visual and auditroy reflexes, such as moving the head and eyes.===