This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Upper Extremity, Subject name: Anatomy
Function of the lumbricals is - 
Select and explain. 
A. Flexion at MCP joint, B. Flexion at IP joints, C. Adduction of the fingers, D. Abduction of the fingers
A: Flexion at MCP joint
Answer: A: Flexion at MCP joint 
Explanation: Ans. is 'a' i.e., Flexion at MCP joint MuscleNerve supplyActionLumbricals (4)First and second: Median nerve; Third and fourth: Deep branch of ulnar nerve.Flex the MP joints & extend the IP joints of the fingers.Palmar interossei (4)Deep branch of ulnar nerve.Adducts digits, flex the MP joints and extends the IP joints.Dorsal interossei (4)Deep branch of ulnar nerve.Abducts fingers, flex MP joints and extends IP joints.