This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Anatomy
Flexion of metacarpophalangeal joint is produced by? 
Select and explain. 
A. Lumbricals, B. Dorsal interossei, C. Palmar interossei, D. All of the above
D: All of the above
Answer: D: All of the above 
Explanation: Ans. is 'd' i.e., All of the aboveMetacarpophalangeal joints o These are ellipsoid joints between head of metacarpals and base of proximal phalanx. Movement at MCP joints are flexion, extension, abduction and adduction.Movement Muscles producing movementsFlexion Main muscles :- The lumbricals and the interossei. Suppoive :- Flexor digitorum profundus and superficialis.Extension Main muscles :- Extensor digitorum.Suppoive muscles :-Extensor indicis (for index finger), Extensor digiti minimi (for little finger)Adduction Palmar interosseiAbduction Dorsal interosseiImpoant fact MCP joint is functionally an ellipsoid joint, but it is condylar joint structurally.