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A study on the optic glands of Sepioteuthis lessoniana from the Red Sea
Waheed M. Emam and Tarek A. Ghareb
Zoology Department, Faculty of Science, Ain Shams University
In the present work the optical glands of the reef squid Lessoniana lessoniana were are found in young and adult individuals. They are paired small elongated organs that lie at the aboral end of the olfactory lobe, on a level with the optic tract. Histologically, the cells of the optical gland are large, with about 60 um in diameter and have spherical nuclei (20 um in diameter). Their cytoplasm is coarsely granulated. Neurosecretory granules were seen in cells of optical glands and stained with paraldehyde fuchsin. No distinct neuropil was observed in these glands and these glands are rich in blood supply. The optic glands were found to be connected with optic nerve fibres to the dorso-lateral lobes of the brain.The function of the optical glands of Sepioteuthis lessoniana was also discussed in this study.
Key words: Optic gland, reef squid, Sepioteuthis lessoniana, Cephalopods, Histology, Neurosecretion.