Abstract
Pronounced ultrastructural changes in the presynaptic terminals of central nervous tissues of rats were observed after various durations of sustained hypoxia or hypercapnic hypoxia. Two distinct types of morphological alterations were found. In the first type, the presynaptic terminal was greatly enlarged, measuring 3–10 μm in the greatest diameter. These terminals contained unusual multilamellar bodies in the form of compact lamellar whorls or loosely arranged concentric lamellae. The second type of terminal changes consisted of aggregated or clumped vesicles, often surrounded by attenuated glial processes. The first type of altered terminals occurred predominantly in the deep cerebellar nuclei, while the second type was present in all regions of the central nervous system examined.
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