Summary
The parasympathetic ganglia of the guinea-pig trachea have been investigated by scanning and transmission electron microscopy. They are covered by a continuous perineurium and connective tissue is found between the neural elements. Blood vessels inside the ganglia have continuous endothelia and are sometimes accompanied by pericytes and a sheath of perineurial cells. Individual neuronal cell bodies and large processes are almost completely covered by a thin layer of satellite cells, except for very small areas that directly face the basal lamina and connective tissue space. Nerve fibres are also completely and individually ensheathed by Schwann cell processes; naked fibres are not found. In some regions of the nerve cell body, there are complex interdigitations between short neuronal processes and satellite cells. Large differences in the size of neurons may indicate the presence of different neuronal populations. Nerve endings containing mainly small clear vesicles are the most common type, and these form synapses on dendrites, but some profiles have many large granular vesicles. These ganglia resemble other parasympathetic, sympathetic and sensory ganglia and not the enteric ganglia. However, an unusual feature of the cytoplasm of the satellite and Schwann cells is the abundance of 10 nm intermediate filaments.
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Baŀuk, P., Fujiwara, T. & Matsuda, S. The fine structure of the ganglia of the guinea-pig trachea. Cell Tissue Res. 239, 51–60 (1985). https://doi.org/10.1007/BF00214902
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DOI: https://doi.org/10.1007/BF00214902