Cells of the Nervous System Flashcards
Central nervous system components (2)
Brain
Spinal cord
Peripheral nervous system components (2)
Cranial nerves
Spinal nerves
About how many neurons in the human brain?
Over 86 billion
2 types of cells in nervous system
Neurons
Glia
Dendrite function
Receive signals
Soma function
Integrate signal
Axon function
Send signal
How many axon(s) does a neuron have?
1
Relatively speaking, how many dendrite(s) does a neuron have?
More than 1
Synapse
Point of contact between neurons
Post-synaptic: dendrite or axon?
Dendrite
Pre-synaptic: dendrite or axon?
Axon
Synaptic cleft
Space between axon and dendrite
Soma
Neuron cell body
Axon hillock
Site of action potential initiation
Golgi
Protein packaging and delivery
Endoplasmic reticulum: what is it, what is synthesized there
Processing center
Synthesized: proteins (rough), lipids (smooth)
Nucleus
Command center
DNA replication and transcription
Ribosomes
Protein synthesis
5 ways neurons are classified
Location Connections Morphology Functionality Gene expression
Projection neuron: definition and example
Neuron that has dendrites and cell body in one region, but axon projects to and synapses in another region (ex: motor neuron- cell body in spinal cord, synapses on muscle)
Efferent
Exiting from
Ex: motor neuron is efferent from spinal cord
Afferent
Going to
Ex: motor neuron is afferent to muscle
Interneurons
Receive and send signals in the same region