ommatidium वाक्य
उदाहरण वाक्य
मोबाइल
- R1 through R9 . These " R cells " tightly pack the ommatidium.
- The pigment cells line the outside of each ommatidium.
- The cornea and pseudocone form the outer ten percent of the length of the ommatidium.
- Each ommatidium contains eight photoreceptor cells ( R1-8 ), support cells, pigment cells, and a cornea.
- Simultaneously, the rhabdomeres in adjacent ommatidia are aligned such that the field of view within an ommatidium is the same as that between ommatidia.
- The portion of the R cells at the central axis of the ommatidium collectively form a light guide, a transparent tube, called the rhabdom.
- Hartline contrasted the response signal of the ommatidium when a single concentrated beam of light was directed at one receptor unit as opposed to three surrounding units.
- To prevent light entering at an angle from being detected by the ommatidium it entered, or by any of the neighboring ommatidia, six pigment cells are present.
- Hence the one ommatidium at the apex of the triangle was the original " eye " of the larval organism, with subsequent rows added as the organism grew.
- The typical apposition eye has a lens focusing light from one direction on the rhabdom, while light from other directions is absorbed by the dark wall of the ommatidium.
- The retinula ( literally, " small retina " ) cells of the ommatidium of the compound eye contain areas from which membranous organelles of conceivable size ( rhabdomeres ) extend.
- In all arthropods, there is always a rhabdom below a crystalline cone, on or near the center of the ommatidium, and always aligned with the path of light.
- Light entering at an angle passes through the thin cross-section of the photoreceptor cell, with only a tiny chance of exciting it, and is absorbed by the pigment cell, before it can enter a neighboring ommatidium.
- The inner 90 % of the ommatidium contains 6 to 9 ( depending on the species ) long and thin photoreceptor cells in the case of some butterflies often abbreviated " R cells " in literature and often numbered, e . g.
- The infraorder Cucujiformia includes the vast majority of phytophagous ( plant-eating ) beetles, united by cryptonephric Malpighian tubules of the normal type, a cone ommatidium with open rhabdom, and lack of functional spiracles on the eighth abdominal segment.
- In true flies, the rhabdom has separated into seven independent rhabdomeres ( there are actually eight, but the two central rhabdomeres responsible for color vision sit one atop the other ), such that a small inverted 7-pixel image is formed in each ommatidium.
- In some species there is a complete separation . for instance, one way to tell adult " Bemisia " from " Trialeurodes " is that the upper and lower parts of the compound eyes are connected by a single ommatidium in Bemisia, while in Trialeurodes they are completely separate.
- :( ec ) I found a rather cute write-up at a quirky site . First it points out the obvious : an ommatidium contains only about 8 rhabdomeres ( photoreceptor cells-see [ http : / / cistron . ca / ommatidia . shtml here for the fruit fly example ).
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