LM of an anterior motor neuron in the spinal cord. Parts of two processes, which are dendrites, project from the soma. The cytoplasm of the cell and its processes is heavily laden with basophilic clumps of Nissl substance. 520×. Luxol fast blue and cresyl violet.
EMs showing ultrastructural features of the neuron soma. Above. The euchromatic nucleus contains a prominent nucleolus (*). A striking feature of the cytoplasm is the presence of multiple cisternae of rough endoplasmic reticulum (RER) (arrows) and an elaborate juxtanuclear Golgi complex. The cytoplasm also contains many slender mitochondria (Mi) and free ribosomes. 13,000×. Left. Throughout the cytoplasm are numerous elements of smooth endoplasmic reticulum (SER) and RER interspersed with mitochondria (Mi). Several lysosomes (arrows) and Golgi complexes (G) G are also seen. 10,000×.