The retina is the light-sensitive layer of tissue inside our eyes. At the top we see the axons going to the optic nerve, to the right of the image. The photoreceptor cells are supported by the pigmented epithelium: the rods (black and white and dim-light vision), and the cones (colour and day-time vision).
This is the type of muscle attached to bones and tendons, the ones that move your limbs. The voluntary muscle, the one that does your bidding. It is striated, made of long and thing fibres that create wonderful patterns. Regular patterns that suggest regular movements. Most of my muscles images take a hint of inspiration from Gustav Klimt.