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Baroque Blood Vessels. Credit: Alfonso Rodríguez-Baeza and Marisa Ortega-Sánchez, 2009.A scanning electron microscope (SEM) image zooms in on the baroque branching structures that send blood to the human brain's cortex. The vessels are organized such that the large blood vessels surround the surface of the brain (top of image), sending thin, dense projections down into the depths of the cortex (bottom of image).

Retina. Coloured scanning electron micrograph (SEM) of rods (yellow) and cones (green) in the retina of the eye. The outer nuclear layer is purple. Magnification x1800 when printed at 10 centimetres wide. [F0010041]

Brain lining.Coloured scanning electron micrograph (SEM) of the lining of the brain, showing the ciliary hairs (orange) of ependymal cells. Ependymal cells are a type of neuroglia (glial cells) that line the ventricles of the brain and produce cerebrospinal fluid (CSF). CSF has a number of functions, including buffering the brain from shock, transporting hormones around the brain and absorbing waste products. The ciliary hairs are used to help circulate the CSF.Magnification: x2000 when printed.