Brain Cells

1. Satellite cells, or ________ surround the neuron cell bodies in ganglia. They regulate the environment around the neuron, (like astrocyte in CNS).

2. Schwann cells (only in PNS) or _________ form a sheath around peripheral axons. The outer surface of the Schwann cell is called the __________.

3. ___________ line the central canal and ventricles. They are filled with CSF.

4. What are the largest and most numerous neuroglia in the CNS.

5. _____________ is the membranous insulation called myelin which increases the speed of the action potential. When the sheath is lined it is said to be myelinated (white matter), unmyelinated (gray matter).

1. Amphicytes

2. Neurilemmal cells, neurilemma

3. Ependymall cells

4. Astrocytes

5. Oligodendrites

6. __________ is a “wondering police force” and “janitorial service” engulfing cellular debris, waste products, and pathogens.

7. _________ are changes in the transmembrane potential that cannot spread far from the area surrounding the site of stimulation.

8. ­­­­________ are Na+ ions that enter the cell and are attracted to the negative changes along the inner surface of the membrane.

9. The transmembrane potential at the ______ ______ and ______ segment represent an integration of all the excitatory and inhibitory stimuli affecting the neuron at that moment.

10. Excitatory and inhibitory stimuli are integrated through interactions between _______ ______. This interaction is the simplest level of information processing in the nervous system.

6. Microglia

7. graded potentials

8. Leak channels

9. axon hillock and initial segment

10. Postsynaptic potentials.

11. The basic functional unit of the nervous system is ______.

12. _______ separate and protect the neurons, provide a supportive framework, act as phagocytes and help regulate composition of interstitial fluid.

13. The CNS consists of the ______...