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Pectoral fin is supported by a series of both endoskeletal and endoskeletal elements.the endoskeleton has pterygiophores of cartilage to which muscles are attached for moving the fin,the proximal pterygiophores are basals and diastal ones are radials.there are three thick basals an outer propterygium,a middle mesopterygium and an inner metapterygium.extending from the basals are three rows of numerous radials forming proximal,mesial and distal cartilage called somactidia arising from distal somactidia are horny,unjointed exoskeletal ceratotrichia or fin rays,they support the fin hole.

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