nevrous system
neurons
single nerve cell that conduct nerve impulses are electricaly excitable.connect all regions of the body to the brain and spinal cord through generation and conduct of nerve impulses
neurogical cells
support,nourish insulate and protect neurouns
structure:Dendrites
are receiving signals
cell body
does the processing,thinking,sorting,deciding
trigger zone
gets triggered
axon
sends fibres,sends nervous impulses
myelin sheath
wraps around the axon and insulates it
synaptic end bulb
sends message to the next cell
function of nerves tissue (sensory function )
receptors sences changes in internal/external environment
sensory(afferent) neurouns conduct sensory impulses from receptors into the CNS
integrative function
interneurons
analyse and store sensory information
make decisions regarding appropriate responces
motor function
respond to stimuli by initiating action
motor neurons conduct motor impulses from CNS to effectors
Grey matter
consists of neuronal cell bodies,dentrites,axon terminals,neuroglia
function: integration and processing
white matter
primarily consists of myelinated axons
Fuction:transmisson of impulses
cns Astrocytes
physically support neuron,create the blood brain barrier,maintain the chemical environment for generation of nerve impilse
cns Oligodendrocytes
forms and maintain myelin sheath,use lipid protein cover to electrically insulate
cns Microglia
function as a phagocytes to protect
cns Ependymal
help produce cerebrospinal fluid
pns Schawann cells
form and maintain myelin sheath,use lipid protein cover to electrically insulate