Nervous System Flashcards
two major types of cells in the nervous system are what?
neurons (transport electrical impulses) and glial cells (support cells for neurons).
collection of neurons in the PNS are what?
ganglion
unipolar neuron is what? bipolar (rare but where is one present?) multipolar (most common)?
a neuron with one process
a neuron with 2 processes (IN THE RETINA)
a neuron with many processes (more than 2)
two types of sensory neurons?
unipolar/bipolar
what type of neuron is multipolar?
motor
What is a perikaryon?
cell body or soma
do neurons have large amounts of mitochondria?
YES. highly active in protein synthesis, lots of euchromatin.
axon hillock is the point where what occurs?
axon originates and where initiation of AP occurs.
mylenation is the wrapping of what kind of cell around the axon?
glial cells.
nissl bodies are what?
dark stained mitochondria
what produces myelin in the CNS? PNS? is mylenation found in all neurons?
oligodendrocyte in CNS
schawnn in PNS
NO. usually in vertebrate neurons though.
neurofilaments correspond to what system? neurotubules?
intermediate filament system (structural and organization) microtubule system (transport highway)
type of tissue in neurons?
neuronal or nervous tissue
how can you tell the difference between a nucleus and nucleolus in a neuron image? difference between axons and dendrites?
nucleus is white due to high amount of euchromatin nucleolus is dark
cant tell the difference between these unless labelled.
what are the four types of synapses?
- axosomatic synapse (axon synapsing on cell body)
- axoaxonic synapse (axon synapsing on axon)
- axodendritic synapse (axon synapsing on dendrite)
- axospinous synapse (axon synapsing on specialized part of dendrite called a spine)