There are five CMC joints connecting carpal and metacarpal bones. The thumb's trapeziometacarpal joint is the most specialized and flexible. The medial four joints are plane synovial joints. The joints increase in range of motion from immobile to highly mobile
Located in posterior forearm, one of five deep extensor muscles. Originates from proximal radius, ulna and interosseous membrane. Forms lateral border of anatomical snuffbox. Innervated by posterior interosseous nerve (C7, C8)
Place thumb pad against middle finger pad without using tips. Keep ring finger and pinky against palm base. Press thumb and middle finger together until tips turn red. Slide thumb from middle to index finger, making cracking sound
Radial deviation moves hand towards thumb side of forearm. Normal range of motion is 15-20 degrees. Main muscles are flexor carpi radialis and extensor carpi radialis. Essential for grasping objects and daily activities
Hand consists of 8 carpal, 5 metacarpal, and 14 phalangeal bones. Fingers are arranged in concentric arches, not straight lines. Fingernails start halfway up top joint, vary in width and curvature
Basic movements include walking, running, jumping, sitting, standing, bending, crawling, climbing. Advanced movements involve reaching, stretching, dancing, and various body positions