Confocal micrograph of mouse embryos at different stages of division from the one-cell to two-cell stage. The green fluorescence shows the microtubules which support the structure of the cell and form a spindle during division of the nucleus. The red stain indicates chromatin in the nucleus which contains the genetic information. The embryos each measure about 0.1 mm in diameter.
Nerve cells. Coloured scanning electron micrograph (SEM) of nerve cells, known as neurones. Nerve cells occur in the brain, spinal cord, and in ganglia. Each nerve cell has a large cell body (brown) with several long processes extending from it. The processes usually consist of one thicker axon and several thinner branched dendrites. The dendrites collect information in the form of nerve impulses from other nerve cells and pass it to the cell body.