An ultrastructural study of the synaptic contacts of α-motoneurone axon collaterals. I. Contacts in lamina IX and with identified α-motoneurone dendrites in lamina VII
1981; Elsevier BV; Volume: 207; Issue: 2 Linguagem: Inglês
10.1016/0006-8993(81)90363-2
ISSN1872-6240
AutoresPer‐Åke Lagerbäck, Lars‐Olof Ronnevi, Staffan Cullheim, Jan‐Olof Kellerth,
Tópico(s)Cellular transport and secretion
ResumoHorseradish peroxidase (HRP) was injected intracellularly in triceps surae alpha-motoneurones. The axons and axon collaterals of these neurones were traced light and electron microscopically. Synaptic boutons of collaterals, in Rexed's lamina IX or in synaptic contact with HRP-stained motoneurone dendrites in lamina VII, were studied ultrastructurally. The boutons exhibited spherical synaptic vesicles and made synaptic contacts of two different types with HRP-stained alpha-motoneurone dendrites in lamina IX and VII, dendrites and cell bodies of large neurones in lamina IX, dendrites of unknown origin in lamina IX and with one cell body of a medium size neurone in lamina IX. The observations are discussed in relation to earlier qualitative and quantitative studies on the synaptology of cat spinal alpha-motoneurones.
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