Figure 1.

Electron Microscopic Examination of the CA1 Stratum Radiatum/Pyramidale Area of the Rat Hippocampus Reveals the Ultrastructure of Mitochondrial Protrusions

(A–G, and L) Some of the protrusions are relatively small (∼100 nm) with either wide or narrow necks (arrowheads in A, C, D, F, and G), whereas others are long tubulovesicular structures extending from the mitochondria (arrowheads in B and E). Typically, these protrusions are derived from the outer mitochondrial membrane; only some of them also include the inner mitochondrial membranes (double arrowheads in H–K). I is an enlarged view of (H). Scale bars in (H)–(J), 100 nm; scale bar in (H) applies to all other micrographs. Note: (A), (F), axonal terminals; (B), (E), and (J), large or small dendrites; (C), (D), (K), and (L), neurites of unclear identity; (H) and (I), glial process. sv, synaptic vesicle clusters. A total of three rats were examined.