2 Wrist ArticulationsRadiocarpal: Radius with the Scaphoid, Lunate, Triquetrum.IntercarpalDistal RadioulnarTriangular Fibro cartilage Complex stabilizes the Radioulnar joint.
3 Hand Articulations Carpometacarpal (CM) Intermetacarpal (IM) Metacarpophalangeal (MP)Interphalangeal (IP)
4 Carpometacarpal and Intermetacarpal Joints CM of the thumb is a saddle jointCM of the four fingers gliding jointsIM reinforced by joint capsules comprised of the dorsal, volar, and two interosseous CM ligaments
5 Metacarpophalangeal Joints Rounded distal heads of the metacarpals articulate with the concave proximal ends of the phalangesReinforced by strong collateral ligaments
6 Interphalangeal Joints The Proximal (PIP), Distal (DIP), and the IP joint of the thumb are all hinge jointsThe articular capsule made up of volar and collateral ligaments surround each IP joint
7 Muscles Retinacula of the Wrist: Tendon Sheaths: The fascial tissue surrounding the wrist thickened into strong fibrous bands called retinacula that form protective passageways through which tendons, nerves, and blood vessels pass.Tendon Sheaths:Sealed at both ends containing synovial fluid, annular pulleys that prevent tendon bowstringing with flexion.