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:silhouettes: NERVOUS SYSTEM nervous…
:silhouettes:
NERVOUS SYSTEM
Neurons
Parts:
Axon
groups called nerves
covered by myelin sheath
white matter
Dendrites
projections connected to others
Cell body
nucleus
grey matter
Types:
Sensory neurons
messages from receptors to CNS
Motory neurons
messages from CNS to effectors
Interneurons
connect others
Nerve impulse
Synaptic transmission
nerve impulse at end of axon
passes from synapse to next dendrite
through neurotransmitters
Organisation
Anatomic division
Peripheral (PNS)
neurons outside CNS
catagories:
spinal nerves
cranial nerves
reflex acts
sensory input
"short circuit", response
Central (CNS)
neurons of brain and spinal cord
parts:
spinal cord:
central canal
brain:
functions:
emotions
language
sensory processing and coordination
parts:
<= cerebrum
cerebellum
brainstem
protective layers:
hard=> bone
soft=> meninges
cerebrospinal fluid
regions:
white matter
axons
grey matter
cell bodies and dendrites
Functional division
Autonomic
involuntary regulation
dual network:
Parasympathetic branch
relaxation
Sympathetic branch
stress
Somatic
under conscious control
Routes of information
Combined pathways
both
Motor pathways
from CNS to effectors
Sensory phatways
from sensory organst to CNS
