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26 Cards in this Set

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  • Back
neurons
masses of nerve cells that react with changes in surroundings (nervous tissue)
dendreite
recieves
branched=communicate with other neurons
receptive
may have spines
may have many dendrites
axon
carries information in or out of brain or to other neurons
vary in size and shape
neuroglial cells
supporting cells in nervous tissue
synapse
small space between neurons
allows electrochemical messages to be sent between neurons
neurotransmitter
carries info from one neuron to another
Central Nervous System
brain
spinal cord
Peripheral Nervous System
nerves and cell bodies outside the CNS that connect them to other body parts: cranial nerves and spinal nerves
Sensory Receptors
picks up sensory information and delivers it to the CNS.
ends of peripheral neurons receive input
"afferent"
motor division
carries information to muscles and/or glands nuerons carry info to effectors
"efferent"
somatic nervous system
carries information to skeletal muscle usually concious activities
autonomic nervous system
carries information to smooth muscle, cardiac muscle, and glands
subconsious
Cell Body
contains: cytoplasm, mitochondria, lysosomes, golgi app, microtubules
neucleus
mature neurons don't divide
sensory neurons
afferent
carry impulse from periphery to CNS
specialized receptor ends or are near receptor cells
interneurons
in the CNS
link neurons
carry out integrativ functions and transmit from one part to another
motor neurons
carry impulses away from CNS to muscles glands etc.
can be accelerators or inhibitory can be voluntary or involuntary
schwann cells
peripheral nervous system
myelin sheath around axon
oigodendrocytes
CNS
mylinating cell
one cell myelinate many axon
microglial cells
CNS
Phagocytice bacteria and debris
go up in numbers when CNS is injured
Astrocytes
shaped like star
many processes
form scar tissue that fills spaces following injury to cns
aid in ion concentration regulation
myelin
insulating layer around an axon
like rubber insulation on a wire
moostly lipids and proteins
Nodes of Ranvier
gaps in sheaths between schwann cells
Neurilemma
cytoplasm and nuclei of cell outside myelin sheath
white matter
contains myelinated axons
gray matter
contains unmyelinated structures
cell bodies, dendrites
multiple sclerosis
symptoms: blurred vision, numb legs or arms, can lead to paralysis
causes: myelin destroyed in various parts of CNS
hard scars form
nerve impulses blocked