Muscles and Tendons MCQs

The extensor carpi radialis brevis muscle originates from the common extensor tendon off the lateral epicondyle of the humerus. So, an injury to this tendon would result in pain near the lateral epicondyle. Tennis elbow is due to the repetitive use of superficial extensor muscles of the forearm the pain is often felt at the lateral epicondyle and it radiates down the posterior surface of the forearm. None of the other bony landmarks are associated with the common extensor tendon, although the medial epicondyle is the origin of the common flexor tendon. Reference: Textbook of Gray's Anatomy for students, 3rd Edition, Upper Limb Page number - 801

This question is asking you to pick what joint, of the joints listed, is the synovial joint. And the only one which fits the bill is the metacarpophalangeal joint, which is a condyloid synovial joint, meaning that it can move in a sagittal and coronal plane. Condyloid joints permit flexion and extension, abduction and adduction, and circumduction. Beyond the synovial membrane, synovial joints have a variety of important characteristics, including: hyaline cartilage to cover the weight bearing surface of the joint, a joint capsule made of accessory ligaments to reinforce the synovial membrane, and accessory structures (such as accessory ligaments, articular discs or menisci, muscles and tendons, and subsynovial fat). Reference: Textbook of B d Chaurasia's handbook of General Anatomy, 4th Edition, Page number - 57