Abstract
The present Study Showed that the falciform process and vitereal vessels is extended upper to retina, which are found only in S. triostegus . The visual cells in both fishes have cones and rods with myoid element, myoids are inconspicuous in S. triostegus . The cones in S. triostegus are large but in L. abu found in four types, long single cones, short single cones, dwarf cones and twin cones. It appears that the cones in L. abu arranged as mosaic include square and row patterns, but they are distributed randomly in S. triostegus , also the cones in L. abu have lateral fins which are lack in S. triostegus .The result showed that three types of ganglion cells, long, medium and small as well as there is additional type called Giant ganglion cell found in L. abu .The head of optic nerve has multiple papillae in S. triostegus , while it is smooth in L. abu
Highlights
The present Study Showed that the falciform process and vitereal vessels is extended upper to retina, which are found only in S. triostegus
(22 تٕ١د دساعح (23) Bowmaker et al.ػٍ ٝعثؼح ػشش ٔٛػاً ِٓ اعّان اٌّ١اٖ اٌؼزتح اٌر ٟذؼ١ف فيِ ٟغير٠ٛاخ ِخرٍفيح ِٓ ػّك اٌثؽ١شج ،فالاعّان اٌر ٟذؼ١ف لشب اٌغطػ ذى ْٛشيثى١رٙا راخ ِخياس٠ؾ شٕائ١يح ٔٚيٛع ٚاؼيذ ِيٓ اٌّخياس٠ؾ اٌّفيشدج اٌمظ١شج ٚالاعّان اٌر ٟذؼ١ف فِٕ ٟرظف ػّيٛد اٌّياء ٌٙيا ِخياس٠ؾ شٕائ١يح وث١يشج اٌؽعيُ ٌٙٚيا اٌرؽغيظ ٔفغيٗ اٌّٛظيٛد فيٟ ِخاس٠ؾ الاعّان اٌغطؽ١ح اِا ف ٟالاعّان اٌر ٟذؼ١ف ف ٟالاػّاق فلا ٚظٛد ٌٍّخاس٠ؾ فٙ١ا ٘ٚ.يزٖ اٌذساعيح ذشياتٗ ٔٛػياً ِيا اٌذساعيح اٌؽاٌ١يح ار في ٟشيثى١ح عيّىح اٌعيش ٞالاعي ٞٛ١ذىي ْٛاٌمؼيثاْ اٌطٍ٠ٛيح ٘ي ٟاٌغيائذج ٚذرٕياشش تٕٙ١يا تؼيغ اٌّخياس٠ؾ اٌّفشدج ٚلذ ٠ؼٛد اٌغثة ف ٟرٌه ٌىٙٔٛا ذؼ١ف ف١ِ ٟاٖ ػىشٖ ٚفي ٟاٌمياع ٌيزا ذىئ ْٛغيثح الاػياءج في٘ ٟيزٖ اٌث ١يح ٚػٍي٘ ٝيزا اٌّغر ِٓ ٜٛاٌؼّك لٍٍ١ح ٌٚزٌه ذى ْٛؼاظرٙا اٌ ٝلٛج ذؽغظ ػاٌ١ح ِّا ذغثة ف ٟص٠ادج ؽٛي اٌمؼثاْ ٘ٚزا ِا اوذذيٗ تؼيغ اٌذساعاخ اٌغاتمح اٌر ٟاٚػؽد اْ ص٠ادج ؽٛي اٌمطؼح اٌخاسظ١ح ٌٍخلا٠ا اٌثظش٠ح ٠ض٠ذ ِٓ لذسذٙا ػٍ ٝاِرظاص اوثش وّ١ح ِيٓ اٌؼيٛء ( ) 16,5اِيا تخظيٛص عيّىح اٌخشيٕ ٟفظٙيشخ في ٟشيثى١رٙا اٌّخياس٠ؾ اٌرٛأِ١يح ٚاٌّخياس٠ؾ اٌّفيشدٖ اٌطٍ٠ٛيح ٚاٌمظي١شج ٚاٌمضِ١يح ٘ٚيزٖ إٌر١عيح ليذ ذشياتٗ تؼيغ اٌذساعياخ ففي ٟاٌغيّىح اٌشيثٛؽ١ح ٚ Carassius auratusظيذخ فيٟ شثى١رٙا ِخاس٠ؾ شٕائ١ح غ١ش ِرغا٠ٚح ِٚخاس٠ؾ ِفشدج ؽٍ٠ٛح ٚتذٕ٠ح ٚاخش ٜؽٍ٠ٛيح ٔٚؽ١فيح ِٚخياس٠ؾ ِفيشدج لظي١شج ٚتذٕ٠يح ٚاخش ٜلظ١شج ٔٚؽ١فح ٚػٕيذ اعيرخذاَ اٌّط١ياف اٌؼيٛئٌٍ ٟرؽيش ٞػيٓ اٌظيثغح اٌثظيش٠ح ٌىيً ٔيٛع ِيٓ اٌّخياس٠ؾ ذثي ٓ١اْ اٌٛؼذج اٌشئ١غح ٌٍّخاس٠ؾ اٌصٕائ١ح ٚتؼغ اٌّخاس٠ؾ اٌّفشدجاٌطٍ٠ٛح ذؽر ٞٛػٍ ٝطيثغح ؼغاعيح ٌٍؼيٛء الاؼّيش ٚاْ اٌٛؼيذج اٌّغاػذج ٌٍّخاس٠ؾ اٌصٕائ١يح ٚاٌّخياس٠ؾ اٌّفيشدج اٌطٍ٠ٛيح الاخيش ٜذؽري ٞٛػٍي ٝطثغيـح ؼغاعيح ٌٍؼيٛء الاخؼيـش ٚاْ اؼيذ اٌّخاس٠ؾ اٌّفشدج اٌمظ١شج ذؽر ٞٛػٍ ٝطثغح ؼغاعح ٌٍؼٛء الاصسق) (24اِا اٌذساعح اٌر ٟاظش٠د ػٍي ٝعيّىح اٌغياٌّْٛ ٚ)25( Salmo salarعّىح اٌضسد (26) Zebrafishفمذ اوذخ ذؽغظ اٌّخشٚؽ اٌمظ١ش ظذاًٚاٌّغّ ٝتاٌّخشٚؽ اٌمضِيٟ ٌ Dwarf Coneلاش يؼح ف يٛق اٌثٕفغيع١ح ٚتٕ يا ًء ػٍ ي ٝرٌيه فثالاِى ياْ الاعيرٕراض تٛظ يٛد اِىأ ١يح ذؽغيظ ٌٍ ي ْٛالاؼّييش ،الاصسق،الاخؼشٚ،الاشؼح فٛق اٌثٕفغع١ح ف ٟعّىح اٌخشٕ ٟالا اْ عّىح اٌعش ٞالاع ٞٛ١ذش ٜالاشي١اء تيالات١غ ٚالاعيٛد ٚلذ ذى ْٛراخ ذؽغظ ِؽذٚد ٌٍـ ْٛالاؼّش ا ٚالاخؼش ِّا ٠ـذي ػٍ ٝاْ اٌغّىـح الاٌٚـ ٝاوصش ذؽغغاً ٌلاٌيـٛاْ ٚؼيـذج فيـٟ
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