Question:
Two halves of a typical bivalve shell are held dorsally by
Two halves of a typical bivalve shell are held dorsally by
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Bivalve Shell Mechanics:
Dorsal Connection & Valve Opening = HINGE LIGAMENT (Elastic spring).
Valve Closing = ADDUCTOR MUSCLES.
Dorsal Connection & Valve Opening = HINGE LIGAMENT (Elastic spring).
Valve Closing = ADDUCTOR MUSCLES.
Updated On: Sep 7, 2026
- Adductor muscle
- Mantle
- Hinge ligament
- Refractor muscle
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The Correct Option is C
Solution and Explanation
Step 1: Understanding the Concept:
Molluscan conchology and functional anatomy: the dorsal hinge ligament acts as an elastic spring mechanism antagonistic to the adductor muscles.
Step 2: Detailed Explanation:
In bivalve shell morphology and biomechanics:
- The two calcified lateral valves (left and right) of a bivalve mollusc are articulated and held together along the dorsal margin by the Hinge Ligament (an uncalcified, elastic conchiolin protein structure consisting of the outer tensile lamellar layer and inner compressible resilium).
- The hinge ligament exerts spring tension to naturally force the valves open when the internal adductor muscles relax.
Step 3: Final Answer:
Thus, the two halves are held dorsally by the Hinge ligament, corresponding to option (C).
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