Nerves 1 Flashcards
what 2 systems make up the nervous system?
central nervous system
peripheral nervous system
what does the CNS and PNS consist of?
CNS - brain and spinal cord
PNS - autonomic NS and somatic NS
describe the movement of autonomic and somatic NS in the PNS
autonomic - involuntary (controls thing you aren’t consciously aware of)
somatic - voluntary (controls things you are aware of)
how many pairs of spinal nerves does the spinal cord have?
31 pairs
spinal nerves in the spinal cord differs from 8 to 7? true or false
true it is 8 ONLY in the spinal cord nerves though
what is the role of the dorsal and ventral root?
ventral - travels sensory/afferent information from the PNS to the CNS
dorsal root- travels motor/efferent information from the CNS to the PNS
why is the white matter & grey matter of the brain called this
white ; as it contains axons
grey matter; contain cell bodies
describe the different neuron types ; bipolar, pseudounipolar and multipolar
bipolar and psuedounipolar neurons have their soma in the middle
multipolar; just a normal neuron
what is Glial?
other 90% of cells
list the 4 Glial cell types in the CNS
astrocytes, oligodendrocytes,microglia and epindimal cells
what are the Glial cells in the PNS?
Schwann cells
satelitte cells
state 4 roles of astrocytes
-maintain chemical concentrations and gradients
-remove waste
-repair
-play important role in blood brain barrier
what do satellite cells surround ?
surround the autonomic & sensory ganglia
what glial cells are responsible for providing the myelin sheath around the axons
oligiodendrocytes and schwann cells
function of microglia cells
immune role, engulf cells/pathogens
