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Type I (asymmetric) thought
to be excitatory
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cleft about 30 nm across
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large (50 nm) round synaptic vesicles
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Tyoe II (symmetric)
throught to be inhibitory
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cleft about 20 nm across
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synaptic vesicles are smaller, and (as fixed)
ellipsoidal or flattened
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zone of apposition usually smaller than for type I
(not in this photo)
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Note that the inhibitory
synapse might by providing negative feedback to stabilize transmission
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gem = gemmule protruding
from granule cell dendrite
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Olfactory bulb of Rhesus
monkey
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S X 80,000
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(PPW fig.5-19, p. 152;
PDP2, 338-9)
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