The cerebral vasculature is a complex network that allows only 18% of the total blood volume of the body through the delicate tissues of the brain. This allows the transport of oxygen and nutrients that are essential to brain function. In the wide field, plane-projection confocal image above, the superficial cerebral vasculature of a mouse - specifically the actin, α-N-acetylgalactosamine residues, and DNA in cell nuclei - are labeled in situ.
Image Source: The Cell Picture Show.