Neuron Structure Flashcards
Dendrite or axon?
Can be single or multiple extensions of the cell body
Dendrite
Dendrite or axon?
Can contain all cytoplasmic organelles except for the Golgi apparatus, especially in proximal dendrites.
Dendrite
Dendrite or axon?
Tapers in a proximo-distal direction
Dendrite
Dendrite or axon?
can branch profusely and can have spines; spines contain spine apparatus and receive the bulk of the synapses
Dendrite
Dendrite or axon?
Almost never myelinated
Dendrite
Dendrite or axon?
Usually ramify close to the cell body
Dendrite
Dendrite or axon?
Responds with graded depolarization or hyperpolarizatino that decrements spatially and temporaly; some can generate action potentials
Dendrite
Dendrite or axon?
Major receptive site of synapses (postsynaptic), but may also be presynaptic
Dendrite (e.g. dendrodendritic synapses)
Dendrite or axon?
Structurally absent but functionally present in unipolar cells
Dendrite
Dendrite or axon?
Major energy consuming portion of a neuron
Dendrite
Dendrite or axon?
Single extension from the cell body or from a dendrite
Axon
Dendrite or axon?
Can contain most cytoplasmic organelles except for Golgi apparatus, rough ER, and ribosomes
Axon
Dendrite or axon?
Trunk stays cylindrical, can branch profusely
Axon
Dendrite or axon?
Terminals enlarge to form boutons that contain synaptic vesicles
Axon
Dendrite or axon?
Varicosities can occur along the trunk for en passant synapses
Axon
Dendrite or axon?
Can be myelinated or unmyelinated
Axon
Dendrite or axon?
Can ramify close to or far away from the cell body
Axon
Dendrite or axon?
APs are generated at the initial segments
Axon
Dendrite or axon?
Major effector site of synapse (presynaptic), but may also be postsynaptic (e.g. axoaxonal synapse)
Axon
Dendrite or axon?
May be absent (e.g. amacrine cells)
Axon
Dendrite or axon?
Energy consumption is low in the axon trunk, but may be low, moderate, or high in the terminals
Axon
What is the perikaryon?
Soma or cell body
Active chromatin
Euchromatin