Detail of the 3D organisation of mitochondria in the retina revealed
The backs of our eyes are studded with millions of photoreceptors, cells in the retina triggered by light to help send electrical impulses to the brain. Differently-shaped ‘rod’ and ‘cone’ photoreceptors work to keep our vision precise and sensitive – and require a constant supply of energy. Here we see bundles cellular power stations – or mitochondria – highlighted in different colours around a single cone cell from a macaque monkey’s eye. To capture this level of detail, the retina was set in resin and a series of pictures taken while shaving away thin layers of tissue. The technique, called serial block face scanning electron microscopy, reveals the mitochondria have pointy 'tops' (left) and swollen bases (right), 10,000 times smaller than a bunch of asparagus. Researchers believe this arrangement helps with mitochondrial fusion – when the powerhouses join and rejuvenate, important to the health of retinal cells in monkeys and humans alike.
BPoD stands for Biomedical Picture of the Day. Managed by the MRC London Institute of Medical Sciences the website aims to engage everyone, young and old, in the wonders of biomedicine. Images are kindly provided for inclusion on this website through the generosity of scientists across the globe.
BPoD is also available in Catalan at www.bpod.cat with translations by the University of Valencia.