Lesson 2: The Skeletal System Lesson 2 The Skeletal System Explore Quiz Flashcards scapula clavicle humerus radius ribs ulna coccyx fibula talus (short bone) phalanges cranium mandible sternum (flat bone) vertebrae (irregular bones) sacrum carpals metacarpals phalanges femur (long bone) patella (sesamoid bone) tibia tarsals metatarsals