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parotoid
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Definitions of parotoid in various dictionaries:
noun - a gland of certain toads and frogs
PAROTOID - The parotoid gland (alternatively, paratoid gland) is an external skin gland on the back, neck, and shoulder of toads and some frogs and salamanders....
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Possible Dictionary Clues |
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Resembling the parotid gland applied especially to cutaneous glandular elevations above the ear in many toads and frogs. |
A parotoid gland. |
Parotoid description |
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The parotoid gland (alternatively, paratoid gland) is an external skin gland on the back, neck, and shoulder of toads and some frogs and salamanders. It can secrete a number of milky alkaloid substances (depending on the species) known collectively as bufotoxins, which act as neurotoxins to deter predation. These cutaneous glands are called parotoid as they are somewhat similarly positioned to mammalian parotid gland, although these have a different function, excreting saliva within the mouth rather than externally excreted defensive chemicals. * A study of the parotoid glands of the Colorado River toad in 1976 found that the parotoid glands were "composed of numerous lobules", each of which is a separate unit with a lumen surrounded by a double cell layer. The cell layers have interlocking microvilli. The study found that the outer cell layer resembled smooth muscle cells, with some organelles hypothesised to "function in some aspects of venom synthesis, active cellular transport and contraction in the discharge of the secretory product". The inner layer was hypothesised to be "involved in venom formation and release". The study noted that the structure of the parotoid glands of the Colorado River toad is very different from the structure of the same glands in the cane toad. There is extensive blood supply to the parotoid glands to deliver cholesterol and other toxin precursor chemicals to the gland.Parotoid glands are sometimes said to be wart-like in appearance, though warts are abnormal growths caused by viral infections while parotoid glands are normal, healthy parts of the animals that bear them. The vague similarity in appearance, however, is the reason behind the mistaken belief that touching a toad causes warts. |