The rhabdome (from Greek rhabdos = " rod, bar ") is the light-guiding axle rod within a Ommatidiums of the compound eye, or a point of the eye ( ocellus ) an arthropod. It is called by the 5-9 of microvilli Retinulazellen, also rhabdomeres formed. There are large amounts of visual pigment (such as rhodopsin ), which absorbs the light energy. The light is directed thereto via Cornealinse and crystal cells and a crystal cone.

It may secondarily lead to a separation of the rhabdomeres, this is called "open rhabdome " and is in the neural superposition eyes, for example, in some Hymenoptera, or to find beetle species.