A Summary of Axon Nomenclature

Adapted from Bodian (1970)

Identification

Characteristics

S-Type Axon, En Passant

Varicosities along axon's length in which clouds of spherical synaptic vesicles are clustered.

Mitochondrion (M)

F-Type Axon, En Passant

Adjacent varicosities contain predominantly flat or elongate synaptic vesicles.

P-Type Axon, En Passant

Varicosities contain pleiomorphic vesicles with or without dense cores.

S/C-Type Axon, En Passant

Varicosities contain co-localized spherical and dense core vesicles.

F/C-Type Axon, En Passant

Varicosities contain co-localized elongate and dense core vesicles.

P/T-Type Axon, En Passant

Varicosities contain pleiomorphic vesicles and many intracytoplasmic tubules.