HAND_1

HAND_1

1. Bones

   • Carpals
     • She Looks Too Pretty; Try To Catch Her = Scaphoid, Lunate, Triquaterate, Pisiform; Trapezium (ThUMb), Trapezoid, Capitate (head), (hook) Hamate
   • Metacarpals
   • Phalanges
     • Proximal, Middle and Distal Phalanx

2. Ligaments

   • Radial and ulnar collateral ligaments on each finger and thumb joint.
   • Volar plate on PIP joint Palmar surface prevents hyperext of PIP
   • Pulleys
     • Annular

3. Tendons

   • Extensor tendons (become extensor hoods. They originate from extensor mms from back of forearm. Attach to central slip on the distal phalanx.
   • Flexor tendons : travel through carpal tunnel. 2 tendons each travel into the volar side of each finger. Flexor policis longus tendon

4. Muscles

   • Hypothenar (little digit)Eminence
   • Thenar (thumb)Eminence
     • Abductor policis brevis
     • Flexor policis brevis
     • Adductor policis
     • Oponnens policis
   • Intrinsic muscles: hold the finger steady and guides during activity
   • Flexors
     • Flexor digitorum profundis. I: Distal phalanx
     • Flexor digitorum superficialis. I: Middle phalanx

5. Nerves

   • Radial.N: Runs along thumb side edge of forearm. Gives sensation to the back of the hand from the thumb to 3rd finger.
   • Median.N: Goes through carpal tunnel. Gives sensation to the thumb, index and ring finger. Innervates thenar mm (opposition)
   • Ulnar.N: Passes through GUOYON's canal between pisiform and hamate. Gives sensation to little finger and half ring finger,

6. Blood Vessels

7. Joints

   • MCP (knuckles): hinge joints
   • PIP (proximal interphalangeal joints) hinge
   • DIP (distal interphalangeal joints) hinge
   • Articular cartilage: absorbs shock and facilitate motion on smooth surface
   • Systemic disease: RA esp in thumb

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