Nervous system

Edit Answers
123456789101112131415161718
Across
  1. 2. cells- they develop as columnar or cuboidal cells of the ependyma which lines the fluid filled ventricles of the brain and central canal of the spinal cord
  2. 5. this surrounds groups of axons which are joined by tight junctions to make a blood nerve barrier.
  3. 7. Sheath- it carries impulses from the central nervous system to the organs and from the organs back to the central nervous system.
  4. 8. cells- they are sometimes called neurolemmocytes, occurs only in the peripheral nervous system and differentiate from precursors in the neural crest.
  5. 9. it is rhe middle layer of meninges lying directly underneath the dura mater
  6. 11. they are typically longer than dendrites and in most neurons they only have one of this.
  7. 12. these are found exclusively in the central nervous system which comprises the brain and spinal cord. They are the most widespread cell lineage.
  8. 13. Mater- it is the thick and outermost layer of meninges which consists of dense irregular connective tissue organized as an outer periosteal layer.
  9. 14. these form the structural and functional units of the central and peripheral nervous system.
  10. 15. it represents sites where nerve impulses are transmitted from one neuron to another.
  11. 17. these are star shaped glial cells in the central nervous system that support and protect neurons by providing metabolic and structural support.
Down
  1. 1. - each nerve fiber individually wrapped by a delicate layer of what connective tissue?
  2. 3. these are intermediate filaments that primarily provide structural support in neuronal axons
  3. 4. mater- it is the innermost layer of meninges which consists of mesenchymally derived cells closely applied to the entire surface of the central nervous system tissue.
  4. 6. a cellular response of a neurons cell body to injury.
  5. 7. this is comprised of 3 protective membranes that surround and protect the brain and spinal cord
  6. 10. - these recieve and integrates signals from other neurons and their number can vary.
  7. 16. these are specialized immune cells in the brain that act as its primary defense system performing immune surveillance and cleanup functions.
  8. 18. ganglia- these ganglia are located in the dorsal root of the spinal nerve and transmits signals from the environment to the central nervous system.