The presence of a cortex and medulla in the superficial pineal gland has been a controversial point in the morphology of this structure in mammals. The published reports indicate contradictory data especially in rodents. In this study the pineal gland of 15-day-old male rats (Rattus norvegicus) were studied, using scanning electron microscopy, in an attempt to determine whether or not a cortex and medulla are apparent in the pineal gland of young rats. The superficial pineal gland of the 15-day-old rat exhibited both a cortex and a medulla; these areas exhibited different structural organizations. The cortex had a thickness of 40-80 μm and the cells did not show a particular arrangement. The center of the gland was composed of a medulla, which had a width of 1000-1200 μm, and consisted of cells arranged in cords; its morphology was distinctly different from that of the cortex.
|Original language||English (US)|
|Number of pages||3|
|Journal||Journal of Veterinary Medicine Series C: Anatomia Histologia Embryologia|
|State||Published - Jun 1 2004|
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