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The ceiling of the midbrain has a couple of optic lobes which
are prominent and used as an optic center that reflex what it
receives from eye retina fibers. The histology of optic tectum has
been studied in Iraqi fish Barbus luteus (Heckel) . It was found that
the number of optic tectum were six main strata organized from the
outside to the inside as follows : the stratum marginal (SM), the
stratum opticum (SO), the stratum fibrosum et griseum superficialis
(SFGS), the stratum griseum central (SGC), the stratum album central
(SAC), the stratum periventricular (SPV), . the tow last strata consider
deep layers on the optic tectum. It was noticed that the superficial
strata was the first (SM), while the thickest strata was the four
(SGC), whic
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