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9.2.11. Pineal Gland
Unit 9 - Endocrine system
9.2.11. Pineal Gland The pineal organ,outgrowth from the roof of the brain,is recognized as a photoreceptor in fishes (it is vestigial in the hag fish), but its glandular structure suggests endocrine activity.removal of the pineal organ of the guppy (Lebistes) is followed by reduced growth rate,skeletal abnormalities,are marked stimulation of both pituitary and thyroid glands.The pineal gland is a light sensitive neuroendocrine structure that lies in the anterior brain and is a well-vascularized organ. This gland secretes melatonin that may play a role in controlling reproduction, growth, and migration.
Last modified: Tuesday, 26 June 2012, 4:59 AM