joints

Question 1

joint capsule

Answer 1

• synovial membrane
  attaches at margin of joint surfaces between cartilage + bone
  produces synovial fluid
  composed of synovial bursae / tendon sheaths
• fibrous membrane
  surrounds + stabilises joint
  parts may thicken to form ligaments

Question 2

plane joints

Answer 2

• articular surfaces are flat so bones slide over each other

- acromioclavicular joint

Question 3

hinge joint

Answer 3

• resembles door hinge
• permits flexion + extension
• elbow joint , interphalangeal joints

Question 4

ball + socket joint

Answer 4

• rounded head fits into a concavity
• permits widest range of motion in several axes
• glenohumeral (shoulder) joint

Question 5

saddle joint

Answer 5

• reciprocal concave / convex articular surfaces
• permits flexion / extension + ad/abduction
• at thumb between metacarpal 1 + trapezium