Nervous System 2 Flashcards
structural role, providing a structural backbone for nerve dendrites and axon extensions
neurofilaments
play a role in transport of cargo, including vesicles with NT’s
microtubules
extends from soma to axon terminal, occasionally associated with axonal and vesicular membranes
SER
enhance neurotransmission
functions: biochemical, structural, immune, nutritive
glia
more efficient conduction
less energy consuming
faster impluse
sensory = acute pain
myelinated axons
leak Na+ ions
slower impulse velocity
sensory = chronic pain/pleasure
motor = autonomic
unmyelinated axons
wrap many times around and axon to form many layers of plasma membrane
schwann cells (myelinated)
single schwann cells can “swallow” 10 axons, continue to communicate with extracellular space
schwann cells (unmyelinated)
myelinate neurons in CNS and increase impulse velocity
ogliodendrocytes (CNS)
scavenge ions and maintain homeostasis
facilitate transport b/t blood and CNS that can be nutritive for both neurons and glia
facilitate transport across BBB
protoplasmic and fibrous astrocytes (CNS)
immune scavengers
continually extend and retract their processes and are attracted to neurons by paracrine factors that they release when injured
microglia (CNS)
synthesize, secrete and excrete cebrospinal fluid
form simple ep. lines
ependymal cells (CNS)
dense irregular CT, strong
epineurium
dense irregular CT, thin
perinerium
loose irregular CT
endoneurium
