Navigation and Organization of the Nervous System

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Across
  1. 6. the making of new neurons
  2. 8. a condition in which children have too many folds (gyri) in the cerebral hemispheres
  3. 11. a reduced ability to produce myelin
  4. 12. (Greek for “front part of the front”) or cerebral hemispheres. becomes the cerebral cortex, basal ganglia, and olfactory bulbs
  5. 15. hindbrain, develops into the myelencephalon (Greek for “the back of the back”; i.e., the medulla)
  6. 16. the brain’s mass will be abnormally small because it lacks the correct number of nervous system cells
  7. 18. By the fourth week of development, the neural plate bends and wraps around itself to form _________
  8. 19. extra connections of the synapses are eliminated
  9. 20. a failure in brain cleavage
  10. 22. is a rare condition characterized by abnormal openings or clefts in the cerebral hemispheres
  11. 23. the spinal cord, spinal fluid, and meninges protrude from the spine
Down
  1. 1. two major nervous system divisions are made: the sensory (or afferent) system and the motor (or efferent) system
  2. 2. period of 3-7 weeks (GA) where the neural tube is formed
  3. 3. involves failure of the neuropores to close properly
  4. 4. a neurodevelopmental period (2-3 months GA) when the face and brain develop out of the superior end of the neural tube
  5. 5. openings of the neural tube
  6. 6. the dorsal ectoderm thickens to form the ___________ ___________
  7. 7. an embryos outer layer that later forms the skin and nervous system
  8. 9. a NTD in which neurological development ceases at the brainstem, leaving the infant without cerebral hemispheres and thus without higher cortical functions
  9. 10. caused by a lack of reelin, resulting in the brain having a smooth appearance, absent of its characteristic hills and valleys
  10. 13. organize structures of the nervous system based on what can be seen by the eye
  11. 14. malformation of the skull in which a malformed portion of the brain, usually the occipital lobe, protrudes from the skull in a sac
  12. 17. when dendrites and axons form connections in order to communicate
  13. 21. The process of forming the neural tube