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Across 1. A connection between nerve cells, by which nervous excitation is transferred from one cell to the other 4. the process occurring when some mechanism within a biological system detects and adjusts for changes within the system 9. a neurochemical made in the brain that is involved in many brain activities, including movement and emotion 12. beneath the tentorium of the cerebellum 14. One of the membranes that sheathes the spinal cord and brain 17. a common chronic neurological disorder that is characterized by recurrent unprovoked seizures 19. a molecule released by neurons at the neuromuscular junction that causes muscle contraction 23. surgical repair of a defect or deformity of the skull 25. Also called adrenalin, a secretion of the adrenal glands (along with norepinephrine) that helps the liver release glucose and limits the release of insulin 28. An altered sensation often described as burning, tingling, or pin pricks 29. The largest portion of the brain, including practically all the parts within the skull except the medulla, pons, and cerebellum and now usually referring only to the parts derived from the telencephalon and including mainly the cerebral hemispheres that are joined at the bottom by the corpus callosum. It controls and integrates motor, sensory, and higher mental functions, such as thought, reason, emotion, and memory 30. complete paralysis of the lower half of the body including both legs, usually caused by damage to the spinal cord 31. the surgical removal of a portion of an intervertebral disk

Down 2. Rhythmic, oscillating motions of the eyes 3. cold-blooded 5. a weak point in a blood vessel where the pressure of the blood causes the vessel wall to bulge outwards 6. The usually long process of a nerve fiber that generally conducts impulses away from the body of the nerve cell 7. one of the threadlike extensions of the cytoplasm of a neuron; dendrites branch into treelike processes and compose most of the receptive surface of a neuron 8. series of membranous layers of connective tissue that protect the central nervous system (brain and spinal cord) 10. surgical repair of a defect or deformity of the skull 11. Spaces in the brain that are located between portions of the brain and filled with cerebrospinal fluid 13. paralysis of all four extremities; quadriplegia 15. A sudden attack, spasm, or convulsion 16. A membranous cover or horizontal partition 18. Extreme sensitivity to light 20. surgical removal of a portion of the cranium 21. an operation in which the surgeon cuts through the covering of a vertebra to reach a herniated disk in order to remove it 22. The trilobed structure of the brain, lying posterior to the pons and medulla oblongata and inferior to the occipital lobes of the cerebral hemispheres, responsible for the regulation and coordination of complex voluntary muscular movement and the maintenance of posture and balance 24. defective vision or blindness in half of the visual field of one or both eyes 26. The cells within the body which make up the nervous system, specifically those along which information travels 27. A subjective sensation or motor phenomenon that precedes and indicates the onset of a neurological episode, such as a migraine or an epileptic seizure