Organization and Nervous tissue Flashcards
Nervous tissue
- vascular tissue comprised of 2 types of cells: neurons and neuroglia
Neurons
circuitry of the NS
highly specialized cells
no mitotic division
Neuroglia
smaller cells
greatly outnumber neurons
support nourish and protect neurons
continue to divide throughout indv life
Dendrites
receive stimuli
start depolarization of nerve
cell body of neuron
maintains cell structures and components
going to have organelles
axon hillock
concentrates action potential
axon
propogates electrical information longest axon (can be one M - ex. motor)
axom terminal
prepares neurochemical release
synaptic bulb
release of communicative chem substance into synapse
unipolar
one continuous axon containing both dendrites
ex. provides info from finger tips to SC with cell body sitting really close to SC
bipolar
one concentrated set of denditres and one axon
multipolar
multiple extensions (most dendritic)
motor neurons inSC (like the M long neurons)
pryamidal neurons in cortex
purkinje
AtCh
neuromuscular junctions
ANS
cognition
seratonin
well-being, happiness, appetite, sleep
DA
motor pathways to brain, reward
NE + Epinephrine
sympathetic response
CO, respiration, vessel constiction
fight or flight mode - where energy is going
GABA
inhibition of signalling (regulatory)
responsible for everything we associate with drinking
6 types of glial cells
CNS - astrocytes, oligodendrocytes, microglia, ependymal cells
PNS - Shcwann cells, Satelitte Cells
Non-myelinating glia
astrocytes
microglia
epenymal cells
Astrocytes
- chemical enviro neuronal connection promotion learning and mem strength create permeability in BB
Microglia
phagocytosis of debris and microbes
ependymal cells
CSF production
blood-CSF barrier
Myelinating
oligodendrycytes
shwann
LOOKS WHITE
Oligodendryutes
found in CNS - coil around many axons
