* Joints of hand 
    * first carpometacarpal joint 
      * Type 
        * Saddle 
      * Articular surface 
        * Distal surface of trapezium 
        * Proximal surface of base of first metacarpal bone
      * Ligaments 
        * Capsular ligament 
        * Lateral ligament 
        * Anterior ligament 
        * Posterior ligament 
      * Relations
        * Anteriorly 
          * Covered by muscles of thenar eminence 
        *  Posteriorly 
          * Long and short extensors of thumb 
        * Medially 
          * First dorsal interosseus muscle , radial artery 
        * Laterally - tendon of abductor pollicis longus 
      * Blood supply 
        * Radial vessels supply blood to synovial membrane 
      * Nerve supply 
        *  First digital branch of median nerve 


  * Metacarpophalangeal joints 
  * .ellipsoid