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Slideshow: Ulna

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Slideshow: Ulna

The Funky Professor videos can viewed here:
http://publishing.rcseng.ac.uk/journal/video?videoTaxonomy=FUNK

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Slideshow: Ulna

  1. 1. The Ulna
  2. 2. The Ulna The Ulna is one of two bones in the forearm
  3. 3. The Ulna lies medially The Ulna
  4. 4. The Radius lies laterally The Ulna
  5. 5. The Ulna is a long bone
  6. 6. It is divided into thirds along its length
  7. 7. It is divided into thirds along its length
  8. 8. It is divided into thirds along its length Proximal third
  9. 9. It is divided into thirds along its length Proximal third Middle third
  10. 10. It is divided into thirds along its length Proximal third Middle third Distal Third
  11. 11. The Proximal Ulna is expanded and has a number of interesting projections Medial view Lateral view Right Ulna
  12. 12. Anterior View Posterior View The Proximal Ulna is expanded and has a number of interesting projections Right Ulna
  13. 13. Proximal Ulna Lateral View Radial Notch The Ulna articulates with the Radial Head at the Proximal Radioulnar Joint Right Ulna
  14. 14. The Ulna Proximal Radio-Ulnar Joint The Ulna articulates with the Radial Head at the Proximal Radioulnar Joint
  15. 15. The Ulna articulates with the Humerus at the Elbow Joint Lateral View Trochlear Notch Right Ulna
  16. 16. Distal Humerus Posterior view Trochlea The Trochlear Notch of the Ulna articulates with the Trochlea of the Humerus This joint permits flexion and extension
  17. 17. Lateral View Olecranon The Triceps Muscle inserts here Right Ulna
  18. 18. Distal Humerus Posterior view Olecranon Fossa In extension the Olecranon Process of the Ulna engages with the Olecranon Fossa of the Distal Humerus
  19. 19. Medial View Coronoid Process
  20. 20. Distal Humerus Anterior View Coronoid Process In Elbow Flexion the Coronoid Process of the Ulna articulates with the Coronoid Fossa of the distal Humerus
  21. 21. In Elbow Flexion the Coronoid Process of the Ulna articulates with the Coronoid Fossa of the distal Humerus
  22. 22. The distal end of the Ulna is much smaller than the proximal end It helps form the wrist joint
  23. 23. The Ulna articulates at both ends with the Radius Proximal Radio-Ulnar Joint Distal Radio-Ulnar Joint
  24. 24. The Distal Ulna has a Rounded Head
  25. 25. The Distal Ulna has a Rounded Head and a small Styloid Process
  26. 26. Muscles attaching to the Ulna
  27. 27. Proximal Ulna Volar Aspect Flexor Digitorum Superficialis Ulnar Head
  28. 28. Pronator Teres Proximal Ulna Volar Aspect The Ulnar head attaches to the medial border of the Coronoid Process Pronates the forearm and flexes the elbow
  29. 29. Volar Aspect Forearm Brachialis
  30. 30. Volar Aspect Forearm Attaches to Coronoid Process and Tuberosity of the Ulna Flexes Elbow Brachialis
  31. 31. Supinator Proximal Ulna Lateral View Posterior View Forearm
  32. 32. Supinator Deep part attaches to the supinator crest and ulna tuberosity Supinates the forearm Proximal Ulna Lateral View Posterior View Forearm
  33. 33. Proximal Ulna Lateral View Supinator Crest Ulna Tuberosity
  34. 34. Flexor Digitorum Profundus Volar Aspect Forearm
  35. 35. Flexor Digitorum Profundus Arises from the medial aspect of olecranon and proximal 3/4 of medial and anterior surfaces of ulna Flexes distal interphalangeal joints, proximal interphalangeal joints, metacarpophalangeal joint of digits 2-5; flexes wrist Volar Aspect Forearm
  36. 36. Pronator Quadratus Volar Aspect Forearm
  37. 37. Pronator Quadratus Volar Aspect Forearm Distal 1/4 of anterior surface of ulna Pronates forearm
  38. 38. Triceps
  39. 39. Triceps Attaches to olecranon process of ulna Extends elbow joint
  40. 40. Anconeus
  41. 41. Anconeus Attaches to postero- lateral aspect of olecranon process of the ulna Extends the elbow joint, abducts ulna in pronation
  42. 42. Flexor Digitorum Profundus Posterior View Anterior View
  43. 43. Flexor Digitorum Profundus Posterior View Anterior View Arises from medial olecranon, proximal 3/4 of medial and anterior surfaces of ulna Flexes distal interphalangeal, proximal interphalangeal, metacarpophalangeal joints of digits 2-5; flexes wrist
  44. 44. Aponeurotic attachment of Flexor Digitorum Profundus Flexor Carpi Ulnaris Extensor Carpi Ulnaris Dorsal aspect of right forearm
  45. 45. Abductor Pollicis Longus
  46. 46. Abductor Pollicis Longus Arises from posterior surface of proximal shaft of ulna Abducts thumb, extends thumb at carpometacarpal joint
  47. 47. Extensor Pollicis Longus
  48. 48. Extensor Pollicis Longus Posterior surface of middle 1/3 of ulna Extends distal phalanx of thumb at carpometacarpal and interphalangeal joints
  49. 49. Extensor Indicis
  50. 50. Extensor Indicis Distal aspect posterior surface of ulna Extends index finger and hand
  51. 51. Abductor Pollicis Longus Anconeus Brachialis Extensor Carpi Ulnaris Extensor Indicis Extensor Pollicis Longus Flexor Carpi Ulnaris Flexor Digitorum Profundus Flexor Digitorum Superficialis Pronator Quadratus Pronator Teres Supinator Triceps Summary of Muscles attaching to the Ulna
  52. 52. Posterior Forearm Abductor Pollicis Longus Origin Posterior surfaces of proximal shaft of ulna and middle third radius and intervening interosseous membrane Insertion Dorsal aspect base of 1st metacarpal, trapezium Action Abducts thumb, extends thumb at carpometacarpal joint Nerve Supply Posterior interosseous nerve (deep branch of radial nerve C7, C8) Blood Supply Posterior interosseous artery
  53. 53. Posterior Forearm Anconeus Origin Distal and posterior aspect lateral epicondyle of humerus Insertion Postero-lateral aspect olecranon process of the ulna Action Extends the elbow joint, abducts ulna in pronation Nerve Supply Posterior interosseous nerve (deep branch radial nerve C7, C8) Blood Supply Posterior interosseous artery
  54. 54. Anterior Arm Brachialis Origin Distal half of anterior surface of humerus Insertion Coronoid process and tuberosity of ulna Action Flexes elbow Nerve Supply Musculocutaneous nerve (C5, C6) Blood Supply Muscular branches of brachial artery, recurrent radial artery
  55. 55. Posterior Forearm Extensor Carpi Ulnaris Origin Common extensor origin on anterior aspect lateral epicondyle of humerus Insertion Base of 5th metacarpal via groove in ulnar styloid Action Extends and adducts hand at wrist joint Nerve Supply Posterior interosseous nerve, (deep branch of radial nerve C7, C8) Blood Supply Ulnar artery
  56. 56. Posterior Forearm Extensor Indicis Origin Distal aspect posterior surface of ulna and interosseous membrane Insertion Extensor expansion of index finger Action Extends index finger and hand Nerve Supply Posterior interosseous nerve (deep branch radial nerve C7, C8) Blood Supply Posterior interosseous artery
  57. 57. Posterior Forearm Extensor Pollicis Longus Origin Posterior surface of middle 1/3 of ulna and interosseous membrane Insertion Base of distal phalanx of thumb Action Extends distal phalanx of thumb at carpometacarpal and interphalangeal joints Nerve Supply Posterior interosseous nerve (deep branch of radial nerve C7, C8) Blood Supply Posterior interosseous artery
  58. 58. Anterior Forearm Flexor Carpi Ulnaris Origin Humeral head: common flexor origin, medial epicondyle of humerus Ulnar head: olecranon and upper 2/3rds posterior border of ulna Insertion Pisiform, hook of hamate, 5th metacarpal Action Flexes and adducts hand (at wrist) Nerve Supply Ulnar nerve (C7 and C8) Blood Supply Ulnar artery
  59. 59. Anterior Forearm Flexor Digitorum Profundus Origin Medial olecranon, proximal 3/4 of medial and anterior surfaces of ulna and interosseous membrane Insertion Base of the distal phalanx of digits 2 - 5 Action Flexes distal interphalangeal joints, proximal interphalangeal joints, metacarpophalangeal joint of digits 2-5; flexes wrist Nerve Supply Medial part: ulnar nerve Lateral part: anterior interosseous branch of median nerve (C8 and T1) Blood Supply Ulnar and anterior interosseous arteries
  60. 60. Anterior Forearm Flexor Digitorum Superficilais Origin Humeral head: common flexor origin, medial epicondyle of humerus Ulnar head: ulnar collateral ligament, and coronoid process of ulna Radial head: superior half of anterior border of radius, anterior oblique line Insertion Tendons split and insert of either side of middle phalanges digits 2 –5 Action Flexes middle phalanges at proximal interphalangeal joints of 2-5 digits; flexes proximal phalanges at metacarpophalangeal joints and hand Nerve Supply Median nerve (C7, C8 and T1) Blood Supply Ulnar artery
  61. 61. Pronator Quadratus Origin Distal 1/4 of anterior surface of ulna Insertion Distal 1/4 of anterior surface of radius Action Pronates forearm Nerve Supply Anterior interosseous nerve from median nerve (C8 and T1 Blood Supply Anterior interosseous artery Anterior Forearm
  62. 62. Anterior Forearm Pronator Teres Origin Humeral head: medial epicondyle, supracondylar ridge of humerus Ulnar head: medial border coronoid process of ulna Insertion Middle of lateral surface of radius Action Pronates forearm, flexes elbow Nerve Supply Median nerve (C6 and C7) Blood Supply Ulnar artery, anterior recurrent ulnar artery
  63. 63. Posterior Forearm Supinator Origin Superficial part (downwards): Lateral epicondyle of humerus, radial collateral and annular ligaments Deep part (horizontal): supinator fossa and crest of ulna Insertion Lateral, posterior and anterior surfaces of proximal 1/3 of radius Action Supinates forearm Nerve Supply Posterior Interosseous nerve (C5 and C6) Blood Supply Recurrent interosseous artery
  64. 64. Triceps Origin Long head: infraglenoid tubercle of scapula; Lateral head: posterior surface of humerus, superior to radial groove Medial head: posterior surface of humerus, inferior to radial groove Insertion Olecranon process of ulna, fascia of forearm Action Extends elbow joint Nerve Supply Radial nerve (C6, C7 and C8) Blood Supply Branches of deep brachial artery Posterior Arm
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Slideshow: Ulna The Funky Professor videos can viewed here: http://publishing.rcseng.ac.uk/journal/video?videoTaxonomy=FUNK

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