Synaptic Remodelling During the Postnatal Differentiation of Peroneal Motoneurones in Kittens
In the adult cat, ultrastructural features of alpha (α) motoneurones (MNs) differ from those of gamma (γ) MNs and it was shown in peroneal motor nuclei that α and γ MNs of similar size could be distinguished without ambiguity (Destombes, Horcholle-Bossavit, Thiesson & Jami, 1992): α MNs have a vacuolated nucleolus and a somatic membrane with a rich equipment of various axonic terminals. They are contacted by five types of synaptic boutons, namely F, S, M, P, C types according to the terminology of Conradi (1969). γ MNs have a compact nucleolus and a somatic membrane with few synaptic boutons, they only receive F and S terminals.
KeywordsActive Zone Axonic Terminal Postnatal Development Somatic Membrane Synaptic Remodelling
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- Conradi, S. (1969) Ultrastructure and distribution of neuronal and glial elements on the motorneurone surface of the spinal cord of the adult cat. Acta physiol. scand. 332, pp 5–48.Google Scholar