Describe the function of the patella

Evan is 25 years old. Would you expect to find synchondroses at the ends of his femur? Explain

If the primary action of digastric is to elevate the hyoid bone, explain its reverse muscle action (RMA)

Most of the limb joints in the human skeleton are of synovial type. Identify and briefly explain the function of the six features that make synovial joints unique from other joint types. (answer max 12 sentences)