nervous system Flashcards
oligodendrocytes
makes myelin in CNS
schwann cells
makes myelin in PNS
astrocytes
support + nutrition in CNS
satellite cells
support + nutrition in PNS
ependymal cells
makes CSF in CNS
microglia
immune/phagocytic cells in CNS
transduction
conversion of environmental stimuli to electrical impulses
sensory functions
special senses, somatic senses, afferent fibers
motor functions
control bodily movement, ANS, efferent fibers, + somatic/visceral muscle
integrative function
process incoming information
nucleus
a group of nerve cell bodies in CNS
ganglion
group of nerve cell bodies in PNS
tract
group of axons in CNS
nerve
group of axons in PNS
what is the inner covering in the CNS?
pia mater
what is the inner covering in the PNS?
endoneurium
what is the middle covering in the CNS?
arachnoid mater
what is the middle covering in the PNS?
perineurium
what is the outer covering in the CNS?
dura mater
what is the outer covering in the PNS?
epineurium
functional classification of bipolar neurons
sensory
functional classification of pseudo-unipolar neurons
sensory
functional classification of multipolar neurons
motor + interneurons
receptors of pseudo-unipolar neurons
nociceptor, proprioceptor, osmoreceptor, baroreceptor, chemoreceptor,etc
nociceptor
detects pain
proprioceptor
detects body position/spatial awareness
osmorecpetors
detect if blood is hyper/hypotonic
barorecptor
detects stretch/pressure in a vessel
chemoreceptor
detects the chemistry of blood (usually)
pseudo-unipolar neuron axon
central process to axon terminal
where do action potential originate in pseudo-unipolar neurons?
1st node of ranvier
where does summation occur in multipolar neurons?
axon hillock
multipolar neuron axon
carries info AWAY from cell body
electrical synapses
rapid bidirectional, contain gap junctions
chemical synapses
one way, synaptic delay, + synaptic fatigue
electrical synapses characteristics
physical fusions between cells allowing electrical info to transfer
chemical synapses characteristics
most common. neuron secretes a neurotransmitter to proceed
types of chemical synapses
axodendritic, axosomatic, axoaxonic, + dendrodenritic
axodendritic synapse
releases NT. to end of the next cell. MOST COMMON
axosomatic synapse
releases NT to cell body of next cell. excitatory
axoaxonix synapse
releases NT to axon of another cell. inhibitory
dendro-dendritic synapse
dendrite to dendrite NT. RARE
CN I foramen
cribiform plate
CN II foramen
optic canal
CN III foramen
superior orbital fissure
CN IV foramen
superior oblique
CN V1 foramen
superior orbital fissure
CN V2 foramen
foramen rotundum
CN V3 foramen
foramane ovale
CN VI foramen
lateral rectus
CN VII foramen
internal acoustic meatus
CN VIII foramen
internal acoustic meatus
CN IX foramen
jugular foramen
CN X foramen
jugular foramen
CN XI foramen
jugular foramen
CN XII foramen
hypoglossal canal
somatic senses
from the body. tactile/touch sensations, pain, temperature, + proprioception
visceral sensations
from the organs
special senses
sight, sound, smell, taste
what makes + releases acetylcholine?
cholinergic neurons
what makes and releases norepinephrine?
adrenergic neurons
what does norepinephrine bind to?
adrenergic receptors
what makes + releases gamma-amino-butyric acid (GABA)?
GABA-nergic neurons
what makes + releases glutamate?
glutaminergic neurons
what makes + releases serotonin?
serotoninergic neurons
what makes + releases dopamine?
dopaminergic neurons
what kind of channel is cholinergic neurons?
ligand gated sodium channels
what kind of channel is adrenergic neurons?
ligand gated sodium channel
what kind of channel is GABA-nergic neurons?
ligand gated chloride channels