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2011-11-17 23:13:18
Flexors Extensors Arm

Forearm anatomy business
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  1. Head of radius
    articulates with humerus and ulna
  2. humeroradial joint
    shallow concave upper surface articulates with capitulum of humerus
  3. proximal radioulnar joint
    circumference of the head of the radius articulates with the radial notch of the ulna and the inner surface of the annular ligament
  4. radial tuberosity
    • insertion of the biceps tendon
    • (on radius because biceps is also a pronator)
  5. shaft of radius
    • convex laterally
    • medially interosseous membrane attaches to the interosseous border
  6. anterior oblique line of the radius
    • descends laterally from the radial tuberosity
    • for the origin of the radial head of the flexor digitorum superficialis
  7. lower end of the radius
    • carpal articular surface
    • ulnar notch
    • styloid process
  8. radiocarpal joint
    formed by the concave carpal articular surface articulating with the scaphoid and lunate
  9. distal radioulnar joint
    concave ulnar notch on the medial side of the radius articulates with the head of the ulna
  10. styloid process of radius
    • lateral side, palpable
    • projects downward beyon the rest of the bone
  11. dorsal tubercle
    • palpable on the posterior surface of the radius.
    • grooved on its medial side by the tendon of the extensor policis longus
  12. Upper end of ulna
    • 2 processes - olecranon and coronoid
    • 2 articular areas - trochlear and radial notches
    • 1 tuberosity
  13. olecranon
    • highest part of the bone
    • forms the point of the elbow
  14. coronoid process
    project from the fron of the bone just below the olecranon
  15. trochlear notch
    • sellar shaped
    • articulates with humerus to form humeroulnar joint
  16. ulnar tuberosity
    • ANT surface of coronoid process
    • insertion for the brachialis
  17. shaft of ulna
    • convex posterioly
    • laterally the enterossesous membrance is attached to the interosseous borner
    • posterior border is subcutaneous from olecranon to styloid process
  18. lower end of ulna
    • small rounded head and styloid process
    • convex lateral surface of head articulates with ulnar notch of radius
    • inferior surface is separated from wrist by an articular disc
  19. median nerve in forearm
    • enters forearm between pronator teres goes down forearm deep to flexor digitorum superficialis
    • appears on radial side of tendons of this muscle just above the wrist.
    • through carpal tunnel
    • supplies all of flexors except flexor Carpi ulnaris and 1/2 FDP
  20. Ulnar nerve in forearm
    • enters between 2 heads of flexor carpi ulnaris
    • descends along the ulnar side of forearm between this muscle and the underlying flexor digitorum profundus
    • crosses superficial to the flexor retinaculum on radial side of pisiform to hand
    • Innervates flexor carpi ulnaris and the FDP
  21. Radial artery in forearm
    • pass alon the radial side of the forearm to wrist
    • pulse felt between the flexor carpi radialis tendon and the radius
    • goes around the lateral border of the wrist deep to the extensor tendons of the thum to the 1st metacarpal space
    • passes between 2 heads of 1st dorsal interosseous muscle and become deep palmar arch
  22. branches of radial artery
    • radial recurrent - anastomoses with the profunda brachii artery in fornt of the lateral epicondyle
    • to muscle on radial side of the forearm
  23. ulnar artery
    • larer of 2 terminal branches
    • passes obliquely deep to the superficial flexors to the ulnar side of the forearm
    • runs straight to the ulnar side of the wrist w/ nerve
    • crosses the flexor retinaculum continues into palm as the superficial palmar arch
  24. Branches of ulnar artery
    • ulnar recurrent artery
    • common interosseous artery
    • unnamed muscular branche to the muscles on ulnar side of forearm
  25. ulnar recurrent arteries
    anastomose around the medial epicondyle with the ulnar collateral branches of the brachial artery
  26. common interosseous artery
    • short stem that passes backward to upper border of the interosseous membrane
    • divides into the anterior and posterior interosseous arteries which supply bood to the muscles innervated by the nerves of the same name
  27. Radial nerve terminal branches
    • superficial radial nerve - cutaneous
    • deep radial nerve (posterior interosseous nerve) - muscular branch
  28. superficial radial nerve
    • descends down the forearm deep to brachioradialis
    • emerges above the wrist
    • goes to skin on the radial half of dorsal hand, dorsal thumb, dorsal index and middle fingers as far as PIP
  29. Deep radial nerve / posterior interosseous nerve
    • pierces supinator to reach the posterior surface of the forearm where it lies between the superficial and deep extensors along with the posterior interosseous artery
    • innervates extensor muscles of forearm except for brachioradialis and extensor carpi radialis longus which are radial nerve before it branches