Week 1:1 Flashcards
Divisions of the CNS
- brain
- spinal cord
brain functions
- receives and processes sensory information
- initiates responses
- stores memories
- generates thoughts and emotions
spinal cord functions
- conducts signals to and from the brain
- controls reflex activities
divisions of the PNS
- motor neurons
- sensory neurons
motor neurons
CNS to muscles and glands
sensory neurons
sensory organs to CNS
divisions of motor neurons
- somatic nervous system
- autonomic nervous system
somatic nervous system controls
voluntary movements
autonomic nervous system controls
involuntary responses
divisions of autonomic nervous system
- sympathetic
- parasympathetic
sympathetic
fight or flight
parasympathetic
rest or digest
Good way to know if something’s part of the PNS
if it’s not encased in bone
soma
body
afferent
sensory, ascending, toward the brain
efferent
motor, descending, away from the brain
white matter
- consists of myelinated axons
- conducts information
gray matter
- cell bodies
- information integrated
dendrites
receive messages
Where is information carried in a neuron?
down the axon via an action potential to the axon terminals
Why are cell bodies important?
integration of information
gray matter in the spinal cord
horns
white matter in the spinal cord
columns
sensory aspect of the spinal cord
- enters the dorsal horn via dorsal root ganglia
- processed into motor command if necessary
motor aspect of the spinal cord
exits ventral horn
What are the protective components?
- blood brain barrier
- CSF
- spinal column
- meninges
blood brain barrier
cells of the nervous system
CSF made of
- salts, sugars, water
- keeps osmotic balance
Through which system does CSF flow?
ventricular system
What helps the brain “float”?
CSF
Why does the brain need to float?
- shock absorption
- prevents compression
- gravity would exert major effect without it
layers of the meninges
- dura mater
- arachnoid mater
- subarachnoid space
- pia mater
mater =
mother
What does the dura mater contain?
- sinuses that help drain the brain
- has own blood supply
What is the arachnoid mater?
- weblike membrane
- helps keep brain suspended along with dura mater
What does the pia mater do?
- follows all brain’s contours
- encases the vessels
subarachnoid space significance
CSF flows through here
Which of the meninges is pain sensitive?
dura mater only
What is present in the spinal meninges but not the cerebrum?
epidural space
subdural space
no subdural space
significance of meninges
- inflammation can be deadly
- nervous system complications
hematoma
- blood supply to meninges is damaged or disrupted
- can have primary or secondary injuries
