Internal Factor - Factors Controlling Metamorphosis in Insects
Likewise to the amphibian metamorphosis, moulting and metamorphosis in insects has been found to be initiated internally via hormones. Hormonal control involves at least three organs of endocrine secretions. They are
(1) Prothoracic gland
(2) Corpora allata
(3) Brain (protocerebrum)
Figure depicts the endocrine glands associated with the brain in moths that is protocerebrum and corpora allata.
Figure: The endocrine glands associated with the brain in meal moths. a) Dorsal view of the brain in a meals moth pupa, b) Transverse section of the protocerebrum in a caterpillar of the meal moth