Which of the following statements is true regarding the extensor mechanism of the fingers?
A) Lumbricales and interossei allow active metacarpophalangeal (MCP) joint flexion,and proximal interphalangeal (PIP) and distal interphalangeal (DIP) joint extension.
B) Extensor digitorum extends the PIP and DIP joints,but not the MCP joint.
C) Lumbricales and interossei work to extend the MCP joint against the force of the long finger flexors.
D) Extensor digitorum is the only muscle that can extend the DIP joint.
Correct Answer:
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