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

1. The Ulna

2. The Ulna
The Ulna is one of two bones in the forearm

3. The Ulna lies medially
The Ulna

4. The Radius lies laterally
The Ulna

5. The Ulna is a long bone

6. It is divided into
thirds along its
length

7. It is divided into
thirds along its
length

8. It is divided into
thirds along its
length
Proximal third

9. It is divided into
thirds along its
length
Proximal third
Middle third

10. It is divided into
thirds along its
length
Proximal third
Middle third
Distal Third

11. The Proximal Ulna is expanded and has a number
of interesting projections
Medial view Lateral view
Right Ulna

12. Anterior View Posterior View
The Proximal Ulna is expanded and has a number
of interesting projections
Right Ulna

13. Proximal Ulna
Lateral View
Radial Notch
The Ulna articulates with the Radial Head at the
Proximal Radioulnar Joint
Right Ulna

14. The Ulna
Proximal Radio-Ulnar Joint
The Ulna articulates with the Radial Head at the
Proximal Radioulnar Joint

15. The Ulna articulates with the Humerus at the Elbow Joint
Lateral View
Trochlear
Notch
Right Ulna

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. Lateral View
Olecranon
The Triceps Muscle inserts here
Right Ulna

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. Medial View
Coronoid Process

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. In Elbow Flexion the
Coronoid Process of the Ulna
articulates with the
Coronoid Fossa of the distal Humerus

22. The distal end of the Ulna is much smaller
than the proximal end
It helps form the wrist joint

23. The Ulna articulates at both ends with the Radius
Proximal Radio-Ulnar Joint
Distal Radio-Ulnar Joint

24. The Distal Ulna has a
Rounded Head

25. The Distal Ulna has a
Rounded Head
and a small
Styloid Process

26. Muscles attaching to the Ulna

27. Proximal Ulna
Volar Aspect
Flexor Digitorum Superficialis
Ulnar Head

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. Volar Aspect
Forearm
Brachialis

30. Volar Aspect
Forearm
Attaches to
Coronoid Process
and Tuberosity of the
Ulna
Flexes Elbow
Brachialis

31. Supinator
Proximal Ulna
Lateral View
Posterior View
Forearm

32. Supinator
Deep part attaches
to the supinator
crest and ulna
tuberosity
Supinates the forearm
Proximal Ulna
Lateral View
Posterior View
Forearm

33. Proximal Ulna
Lateral View
Supinator Crest
Ulna Tuberosity

34. Flexor Digitorum Profundus
Volar Aspect
Forearm

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. Pronator Quadratus
Volar Aspect
Forearm

37. Pronator Quadratus
Volar Aspect
Forearm
Distal 1/4 of anterior
surface of ulna
Pronates forearm

38. Triceps

39. Triceps
Attaches to olecranon
process of ulna
Extends elbow joint

40. Anconeus

41. Anconeus
Attaches to postero-
lateral aspect of
olecranon process of
the ulna
Extends the elbow
joint, abducts ulna in
pronation

42. Flexor Digitorum Profundus
Posterior
View
Anterior
View

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. Aponeurotic attachment of
Flexor Digitorum Profundus
Flexor Carpi Ulnaris
Extensor Carpi Ulnaris
Dorsal aspect of right forearm

45. Abductor Pollicis
Longus

46. Abductor Pollicis
Longus
Arises from posterior
surface of proximal
shaft of ulna
Abducts thumb,
extends thumb at
carpometacarpal joint

47. Extensor Pollicis Longus

48. Extensor Pollicis Longus
Posterior surface of
middle 1/3 of ulna
Extends distal phalanx of
thumb at carpometacarpal
and interphalangeal joints

49. Extensor Indicis

50. Extensor Indicis
Distal aspect posterior
surface of ulna
Extends index finger and
hand

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. 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. 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. 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. 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. 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. 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. 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. 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. 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. 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. 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. 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. 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