At the very center of each
ommatidium are the dendrites of one or more neurons called eccentric cells that are electrically coupled to the retinular cells (Fahrenbach, 1969, 1975).
Printed images were magnified, and optical microscope images were used to obtain measurements of dorso-ventral distance (eye width) and anterior-posterior distance (eye length) of the compound eyes, and the SEM images were used to obtain measurements of individual square
ommatidium area per eye using a slide caliper (GB/T1214.1-1214.4, Shanghai Hengsheng Tools Co., Ltd., Shanghai, China).
Watching carefully, the man's mind is helplessly mesmerized by the instantaneous images playing in each
ommatidium: it could be an erupting undersea volcano, might be a falcon's-eye view of a landscape, perhaps just a leaf about to fall.
Each
ommatidium has a cornea to focus the light, a long cone full of photoreceptors, and a single axon (neuron) link to the optic nerve at the end, to connect it to the brain.
Each small eye, known as an
ommatidium, consists of a corneal lens, a crystalline cone, and a light sensitive organ at the base.
Each
ommatidium has its own cornea, lens, and photoreceptor cells for distinguishing brightness and color.
Most of the fossils are fully articulated (excluding macrophytes) and many preserve soft tissues, and organic patterns and structures rarely found in the fossil record: patterns of colouring, nerviation, gut tracts, and
ommatidium of insects, stomach contents and muscles of fishes, skin and integumentary tissues of such as frogs, salamanders, lizards, crocodiles and dinosaurs.
Ant compound eye: size-related
ommatidium differences within a single wood ant nest.
Eyes reduced to 1
ommatidium. Lamellae of metapleural lobes low.
The insect nervous system is adept at setting up a temporary rule of thumb such as, "Steer a course such that the light rays hit your eye at an angle of 30[degrees]." Since insects have compound eyes, this will amount to favoring a particular
ommatidium (individual optical tube radiating out from the center of the compound eye).
No apparent borders between each
ommatidium or between the compound eye and the head were observed.