Central Nervous System Flashcards
general reflex
automatic and rapid motor response= no brain input needed
what is found between a sensory and motor neuron in a polysynaptic reflex?
axon terminals of sensory neurons connected via one or more interneurons to a motor neuron
where is CSf produced?
continuously produced via ependymal cells of capillary. rich choroid plexus
how is CSF returned to blood post circulation?
arachnoid granulations
arachnoid granulations
; portions of arachnoid mater that extend to dural sinuses
hydrocephalus
overproduction of CSF
cranial pressure causes damage to brain
treat. with shunt to deliver excess CSF to abdominal cavity
PET scan
glu utilization; high metabolic areas
Meninges superficial to deep
dura mater
arachnoid mater
pia mater
where is CSF located?
subarachnoid space : between arachnoid and pia mater
dura mater
dense irregular CT
-periosteal layer attached to skull
-meningeal layer true external covering of brain
arachnoid mater
reticular CT
weblike extensions attach to underlying pia ; extensive blood supply
pia mater
very thin, loose areolar CT
rich vascularization
subdural space
between dura mater and arachnoid mater
what kinds of substances can cross the BBB?
lipid soluble substances readily cross
which cell junctions (glial cells) help form BBB
astrocytes
