1.
The Radius

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

3.
The Radius
The Radius is one of two bones in the forearm
It lies laterally

4.
The Ulna lies medially

5.
The Radius
The Radius is a long bone
Right side, posterior view

6.
The Radius
It is divided into
thirds along its
length
Right side, posterior view

7.
The Radius
It is divided into
thirds along its
length
Right side, posterior view

8.
The Radius
It is divided into
thirds along its
length
Proximal third
Right side, posterior view

9.
The Radius
It is divided into
thirds along its
length
Proximal third
Middle third
Right side, posterior view

10.
The Radius
It is divided into
thirds along its
length
Proximal third
Middle third
Distal Third
Right side, posterior view

11.
The Radius
The Radius Articulates at the proximal end with the
Humerus at the Elbow Joint

12.
The Radius
The Radius Articulates at the distal end with the Carpus
at the Wrist Joint

13.
The Radius
The Radius Articulates at both ends with the ulna at the
Proximal Radio-Ulnar Joint

14.
The Radius
The Radius Articulates at both ends with the ulna at the
Proximal Radio-Ulnar Joint
Distal Radio-Ulnar Joint

15.
The Radius
Oblique View Anterior View
(Supination)
Proximal Radius
Right side

16.
The Radius
Oblique View Anterior View
(Supination)
Head of Radius
Right side

17.
The Radius
Oblique View Anterior View
(Supination)
Head of Radius articulates with
Capitulum of the Distal Humerus
Right side

18.
Capitulum of
Distal Humerus
articulates with
Head of Proximal Radius
The Radius
Right side

19.
The Radius
Oblique View Anterior View
(Supination)
Neck of Radius
Right side

20.
The Radius
Oblique View Anterior View
(Supination)
Neck of Radius surrounded by the Annular Ligament
Right side

21.
The Radius
Oblique View Anterior View
(Supination)
Neck of Radius surrounded by the Annular Ligament
This allows the Radius to rotate around the Ulna in
Pronation and Supination
Right side

22.
Elbow Joint
Supination Pronatio
n

23.
Elbow Joint
Supination
Pronatio
n

24.
The Radius
Oblique View Anterior View
(Supination)
Radial Tuberosity
Right side

25.
The Biceps muscles attaches
distally to the radius
It flexes the elbow joint and
supinates the forearm
Radial Tuberosity
The Radius

26.
The Radius
Dorsal aspect
Distal Radius
Lateral Medial
Right side

27.
The Radius
Dorsal aspect
Radial Styloid
This is the
lateral side
because the
Radial Styloid
is prominent
distally
Medial
Right side

28.
The Radius
Distal Radius – Lateral View
Anterior / Volar Surface
Posterior / Dorsal Surface

29.
The Radius
Distal Radius – Lateral View
The Volar Surface has a gentle curve in
the Anterior or Volar direction
Anterior / Volar Surface
Posterior / Dorsal Surface

30.
The Radius
Radial Styloid – Lateral View
Anterior / Volar Surface
Posterior / Dorsal Surface

31.
The Radius
Dorsal aspect
Lister’s Tubercle
Lateral Medial
Right side

32.
The Radius
Dorsal View
Lister’s Tubercle
Lateral Medial
Tendon of Extensor
Pollicis Longus
courses just medial to
the Tubercle

33.
The Radius
The groove for tendon of
Extensor Carpi Radialis
Brevis
lies just lateral to
Lister’s Tubercle
Dorsal aspect
Lister’s Tubercle
Lateral Medial

34.
The Radius
The groove for tendon of
Extensor Carpi Radialis
Longus
lies just lateral to the groove
for Extensor Carpi Radialis
Brevis
Dorsal aspect
Lister’s Tubercle
Lateral Medial

35.
The Radius
Dorsal aspect
Lister’s Tubercle
Lateral Medial
The groove for tendon of
Extensor Pollicis Longus
lies just medial to
Lister’s Tubercle

36.
The Radius
Dorsal aspect
Lister’s Tubercle
Lateral Medial
The groove for tendons of
Extensor Digitorum
Extensor Indicis
lies just medial to
Extensor Pollicis Longus

37.
The Radius
Distal Radius Articular Surface
Posterior / Dorsal
Surface
Anterior / Volar
Surface

38.
The Radius
Distal Radius Articular Surface
Posterior / Dorsal
Surface
Anterior / Volar
Surface
Lateral Fossa
articulates
with the
Scaphoid

39.
The Radius
Distal Radius Articular Surface
Posterior / Dorsal
Surface
Anterior / Volar
Surface
Medial Fossa
articulates
with the
Lunate

40.
The Radius
Posterior / Dorsal
Surface
Anterior / Volar
Surface
This region – the Ulnar Notch
articulates with the distal ulna at the
Distal Radio-Ulnar
Joint

41.
Posterior view
Muscles attaching to dorsal
aspect of Radius
Supinator

42.
Posterior view
Muscles attaching to dorsal
aspect of Radius
Supinator

43.
Posterior view
Muscles attaching to dorsal
aspect of Radius
Pronator Teres

44.
Posterior view
Muscles attaching to dorsal
aspect of Radius
Pronator Teres

45.
Posterior view
Muscles attaching to dorsal
aspect of Radius
Pronator Teres

46.
Posterior view
Muscles attaching to dorsal
aspect of Radius
Abductor Pollicis Longus

47.
Posterior view
Muscles attaching to dorsal
aspect of Radius
Extensor Pollicis Brevis

48.
Posterior view
Muscles attaching to dorsal
aspect of Radius
Extensor Pollicis Brevis

49.
Posterior view
Muscles attaching to dorsal
aspect of Radius
Brachioradialis

50.
Posterior view
Muscles attaching to dorsal
aspect of Radius
Brachioradialis

51.
The Radius
Muscles attaching to Volar Aspect
Biceps

52.
The Radius
Muscles attaching to Volar Aspect
Biceps

53.
The Radius
Muscles attaching to Volar Aspect
Supinator

54.
The Radius
Muscles attaching to Volar Aspect
Supinator

55.
The Radius
Flexor Digitorum Superficialis
Radial Head
Muscles attaching to Volar Aspect

56.
The Radius
Flexor Digitorum Superficialis
Radial Head
Muscles attaching to Volar Aspect

57.
The Radius
Flexor Pollicis Longus
Muscles attaching to Volar Aspect

58.
The Radius
Flexor Pollicis Longus
Muscles attaching to Volar Aspect

59.
Muscles attaching to Volar Aspect
The Radius
Pronator Teres

60.
Muscles attaching to Volar Aspect
The Radius
Pronator Teres

61.
The Radius
Pronator Quadratus
Muscles attaching to Volar Aspect

62.
The Radius
Pronator Quadratus
Muscles attaching to Volar Aspect

63.
The Radius
Brachioradialis
Muscles attaching to Volar Aspect

64.
The Radius
Brachioradialis
Muscles attaching to Volar Aspect
Posterior view

65.
Summary of Muscles Attaching to the Radius
• Abductor Pollicis Longus
• Biceps
• Brachioradialis
• Extensor Pollicis Brevis
• Flexor Digitorum Superficialis
• Flexor Pollicis Longus
• Pronator Teres
• Pronator Quadratus
• Supinator