Key result
Ultrastructural analysis of two FR-type cat gastrocnemius α-motoneurons revealed that boutons covered 40-50% of the cell body and about 80% of proximal dendrites, with 70% being F-type.
This study details the ultrastructural synaptic organization of FR-type alpha-motoneurons in cats, showing high bouton coverage on proximal dendrites.
Maps bouton coverage on feline alpha-motoneurons; extends ultrastructural mapping in animal models but leaves open human translation.
Two intracellularly stained cat gastrocnemius α‐motoneurons of the FR‐type (Burke et al., '73) were studied ultrastructurally. The architecture and synaptology of the cell body and proximal parts of the dendrites were analyzed from a long series of consecutive sections, according to a method presented in a preceding paper (Conradi et al., '79a). Several of the dendrites had a base diameter exceeding 10 μm. The proportion of the surface covered by boutons was 40‐50% for the cell body and about 80% for the proximal dendrites. In both regions, about 20% of the boutons were of the S‐type and 70% of the F‐type. The large C‐boutons were clustered around the dendritic roots and were also present on the axon hillock. M‐boutons of dorsal root origin were located on the proximal parts of the majority of the dendrites.
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Kellerth et al. (1979) studied this question. Ultrastructural analysis was evaluated on Architecture and synaptology of the cell body and proximal parts of the dendrites. Ultrastructural analysis of two FR-type cat gastrocnemius α-motoneurons revealed that boutons covered 40-50% of the cell body and about 80% of proximal dendrites, with 70% being F-type.