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An ommatidium contains a cluster of photoreceptor cells surrounded by support cells and pigment cells. The outer part of the ommatidium is overlaid with a transparent cornea . Each ommatidium is innervated by one axon bundle (usually consisting of 6–9 axons , depending on the number of rhabdomeres ) [ 2 ] : 162 and provides the brain with one ...
Compound eye of Antarctic krill as imaged by an electron microscope. A compound eye is a visual organ found in arthropods such as insects and crustaceans.It may consist of thousands of ommatidia, [1] which are tiny independent photoreception units that consist of a cornea, lens, and photoreceptor cells which distinguish brightness and color.
Each ommatidium contains 8 photoreceptor cells, each of which forms a rhabdomere (rhabdomeres 7 and 8 overlap vertically; therefore, only rhabdomere 7 is visible externally). Neurodegeneration leads to loss or degradation of photoreceptors. [3] By visualizing and counting the intact rhabdomeres, degradation level can be measured.
These DNA kits for dogs give you way more information than your dog’s breed composition. Many of the kits can be upgraded to include more health and trait testing or allergy and age tests.
Skin conditions in dogs are very common, so it's important to recognize the symptoms and understand the factors that cause them. Dr. Rebecca MacMillan, a vet with over 15 years of experience, says ...
This list of dog diseases is a selection of diseases and other conditions found in the dog. Some of these diseases are unique to dogs or closely related species, while others are found in other animals, including humans.
Dogs with very short hair may have sensitive skin on their paws from cracking through the icy crust on top of snow. Some Vaseline applied before a walk can protect their fragile feet, Fine says ...
Head of Polistes with two compound eyes and three ocelli (circled). A simple eye or ocellus (sometimes called a pigment pit [1] [2]) is a form of eye or an optical arrangement which has a single lens without the sort of elaborate retina that occurs in most vertebrates.