2
The hinge ligament hold the two shells together as well as the adductor muscles which controls the opening and closing of the bivalve.
posterior and anterior adductor muscles
Clams close their shells with powerful adductor muscles which pull the two valves together. A springy ligament at the hinge pulls the shell open when the muscles relax. Just like us, the clam needs to use nerve cells to signal the muscle to do its thing.
The hinge ligament is a flexible structure that connects the two halves (valves) of a clam shell at the hinge. It acts as a spring to allow the shell to open and close. When the adductor muscles relax, the hinge ligament helps the clam's shell to open.
Clams have developed strong adductor muscles to keep out predators.,
Some stoves are referred to as clam shells because they resemble the form and function of the shells of a clam. They are compact with hinge joining two halves.
The clam does. Clams and other bivalves have very strong muscles that hold the shells tightly closed whenever they're in danger.
Diaphragm and intercostal muscles.
the adductor
The two facial muscles that are circular are the Orbicularis Oculi(around eye), and the Orbicularis Oris(around mouth).
The shell of a clam consists of two valves hinged together along the dorsal side (front). On the opposite end of where the clam opens is a swollen region (the umbo) where the shell of the clam starts to grow.
In clams, it's used to open and close the shell.