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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 ...
Signs of ear infection include shaking of the head, and scratching at or under the ear. Some animals may also paw the ear or try to rub it on other objects to relieve pain and discomfort. Ear infections often result in a darker red ear, dirt in the ear, or a general inflamed appearance. Chronic allergic otitis externa in a dog with atopic ...
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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.
However, Shola, an English Shepherd who was forced to retire as a mountain rescue dog due to the condition, has helped scientists create a new test that could mean the end of PRA.
Some causes of transient or secondary diabetes are Cushing's syndrome, glucocorticoid, progestin or other steroid use, and the hormones of pregnancy or heat. In these cases, correcting the primary medical issue may mean a return to non-diabetic status. [91] [93] [94] Common signs include weight loss, increased drinking and urination, and cataracts.
8. Corgi. The corgi—aka, everyone’s favorite short-legged pup—is one of the most recognizable dogs with pointy ears. Beloved by Queen Elizabeth II, these dogs have been favored by the kings ...
Cats, as well as dogs with erect ears that have control over ear direction, may be seen with one or both ear pinnas held at an odd or flattened angle. The most common lesion associated with ear mites is an open or crusted ("scabbed") skin wound at the back or base of the ear, caused by abrasion of the skin by hind limb claws, as the ear has ...