Why is there a pearl in a mussel

Mussels are the common name, mainly used to refer to bivalve mollusks (Bivalvia). They are animals with a reduced head, yellowish ax-shaped legs that help it move in the sand, a 2-piece shell held together by ligaments, and two muscles that open and close the shell. On the inner surface and operating on the principle of a window, the shell is surrounded by a horny layer on the outer surface, a layer of limestone in the middle and finally a mother-of-pearl layer behind the shell, which is the lapel of the mussel, and then two gill plates located in the middle mantle cavity. legs and body.

Giải thích: Vì sao trong trai, sò có viên ngọc?

The birthplace of pearls is molluscs such as scallops, beach mussels and freshwater mussels. There are many people who have the following thoughts: the bigger the mussels, the bigger the pearls inside. Reality is not so. Only live parasites or foreign objects penetrate into the body of clams and mussels can have pearls.

Try to separate a mussel or scallop shell and see that the innermost layer of the shell has the brightest light, flashing pearl-like colors, this is called the “pearl layer”, it is the pearly substance secreted by the outer membrane. constitutive. When the parasite enters the shell, the shell is hard, for protection, the outer membrane of the clam, the mussel will quickly secrete the pearly substance surrounding this parasite, so it will take a long time to form. out pearls.

Sometimes when some sand particles fall into the shell, the mussels make them temporarily unable to push it out. After suffering a lot of painful stimulation, they quickly secrete a substance from the outer membrane. to gradually encircle it.

Over time, the outside of the sand grain is covered with a very thick pearl, and has also turned into a round pearl.


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