49.1 glia in the brain and spinal cord

Question 1

glial cells in the PNS

Answer 1

• ependymal
• microglia
• oligodendrocytes
• astrocytes
• radial glia

Question 2

ependymal

Answer 2

-line ventricles and have cilia that circulate cerebrospinal fluid

Question 3

microglia

Answer 3

-protect nervous system from invading microorganisms

Question 4

oligodendrocytes

Answer 4

-axon myelination

(like Schwann cells do in the PNS)

Question 5

astrocytes

Answer 5

• structural support for neurons
• regulate extracellular concentrations of ions/ neurotransmitters
• facilitate synapses
• blood brain barrier
• stem cell: can generate neurons and more glia

Question 6

blood brain barrier

Answer 6

in development, astrocytes induce cells that line the capillaries in the CNS to form tight junctions so that most substances can’t get int the brain

Question 7

Radial Glia

Answer 7

-important in development of nervous system
-in embryo, it forms tracks neurons can migrate through from the neural tube
(which forms the CNS later)
-stem cells : can generate neurons and more glia