The Radius

The Radius

The Radius is one of two bones in the forearm

The Radius

The Radius is one of two bones in the forearm

It lies laterally

The Ulna lies medially

The Radius

The Radius is a long bone

Right side, posterior view

The Radius

It is divided into

thirds along its

length

Right side, posterior view

The Radius

It is divided into

thirds along its

length

Right side, posterior view

The Radius

It is divided into

thirds along its

length

Proximal third

Right side, posterior view

The Radius

It is divided into

thirds along its

length

Proximal third

Middle third

Right side, posterior view

The Radius

It is divided into

thirds along its

length

Proximal third

Middle third

Distal Third

Right side, posterior view

The Radius

The Radius Articulates at the proximal end with the

Humerus at the Elbow Joint

The Radius

The Radius Articulates at the distal end with the Carpus

at the Wrist Joint

The Radius

The Radius Articulates at both ends with the ulna at the

Proximal Radio-Ulnar Joint

The Radius

The Radius Articulates at both ends with the ulna at the

Proximal Radio-Ulnar Joint

Distal Radio-Ulnar Joint

The Radius

Oblique View Anterior View (Supination)

Proximal Radius

Right side

The Radius

Oblique View Anterior View (Supination)

Head of Radius

Right side

The Radius

Oblique View Anterior View (Supination)

Head of Radius articulates with Capitulum of the Distal Humerus

Right side

Capitulum ofDistal Humerusarticulates with

Head of Proximal Radius

The Radius

Right side

The Radius

Oblique View Anterior View (Supination)

Neck of Radius

Right side

The Radius

Oblique View Anterior View (Supination)

Neck of Radius surrounded by the Annular Ligament

Right side

The Radius

Oblique View Anterior View (Supination)

Neck of Radius surrounded by the Annular LigamentThis allows the Radius to rotate around the Ulna in

Pronation and Supination

Right side

Elbow Joint

Supination Pronation

Elbow Joint

Supination

Pronation

The Radius

Oblique View Anterior View (Supination)

Radial Tuberosity

Right side

The Biceps muscles attaches distally to the radius

It flexes the elbow joint and supinates the forearm

Radial Tuberosity

The Radius

The Radius

Dorsal aspect

Distal Radius

Lateral Medial

Right side

The Radius

Dorsal aspect

Radial Styloid

This is the lateral side because the

Radial Styloid

is prominent distally

Medial

Right side

The Radius

Distal Radius – Lateral View

Anterior / Volar Surface

Posterior / Dorsal Surface

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

The Radius

Radial Styloid – Lateral View

Anterior / Volar Surface

Posterior / Dorsal Surface

The Radius

Dorsal aspect

Lister’s Tubercle

Lateral Medial

Right side

The Radius

Dorsal View

Lister’s Tubercle

Lateral Medial

Tendon of Extensor Pollicis Longus courses just medial to the Tubercle

The Radius

The groove for tendon of

Extensor Carpi RadialisBrevis

lies just lateral to Lister’s Tubercle

Dorsal aspect

Lister’s Tubercle

Lateral Medial

The Radius

The groove for tendon of

Extensor Carpi RadialisLongus

lies just lateral to the groove for Extensor Carpi Radialis Brevis

Dorsal aspect

Lister’s Tubercle

Lateral Medial

The Radius

Dorsal aspect

Lister’s Tubercle

Lateral Medial

The groove for tendon of

Extensor Pollicis Longus

lies just medial to Lister’s Tubercle

The Radius

Dorsal aspect

Lister’s Tubercle

Lateral Medial

The groove for tendons of

Extensor DigitorumExtensor Indicis

lies just medial to Extensor Pollicis Longus

The Radius

Distal Radius Articular Surface

Posterior / Dorsal Surface

Anterior / Volar Surface

The Radius

Distal Radius Articular Surface

Posterior / Dorsal Surface

Anterior / Volar Surface

Lateral Fossa articulates with the Scaphoid

The Radius

Distal Radius Articular Surface

Posterior / Dorsal Surface

Anterior / Volar Surface

Medial Fossa articulates with the Lunate

The Radius

Posterior / Dorsal Surface

Anterior / Volar Surface

This region – the Ulnar Notch articulates with the distal ulna at the Distal Radio-Ulnar Joint

Posterior view

Muscles attaching to dorsal aspect of Radius

Supinator

Posterior view

Muscles attaching to dorsal aspect of Radius

Supinator

Posterior view

Muscles attaching to dorsal aspect of Radius

Pronator Teres

Posterior view

Muscles attaching to dorsal aspect of Radius

Pronator Teres

Posterior view

Muscles attaching to dorsal aspect of Radius

Pronator Teres

Posterior view

Muscles attaching to dorsal aspect of Radius

Abductor Pollicis Longus

Posterior view

Muscles attaching to dorsal aspect of Radius

Extensor Pollicis Brevis

Posterior view

Muscles attaching to dorsal aspect of Radius

Extensor Pollicis Brevis

Posterior view

Muscles attaching to dorsal aspect of Radius

Brachioradialis

Posterior view

Muscles attaching to dorsal aspect of Radius

Brachioradialis

The Radius

Muscles attaching to Volar Aspect

Biceps

The Radius

Muscles attaching to Volar Aspect

Biceps

The Radius

Muscles attaching to Volar Aspect

Supinator

The Radius

Muscles attaching to Volar Aspect

Supinator

The Radius

Flexor Digitorum SuperficialisRadial Head

Muscles attaching to Volar Aspect

The Radius

Flexor Digitorum SuperficialisRadial Head

Muscles attaching to Volar Aspect

The Radius

Flexor Pollicis Longus

Muscles attaching to Volar Aspect

The Radius

Flexor Pollicis Longus

Muscles attaching to Volar Aspect

Muscles attaching to Volar Aspect

The Radius

Pronator Teres

Muscles attaching to Volar Aspect

The Radius

Pronator Teres

The Radius

Pronator Quadratus

Muscles attaching to Volar Aspect

The Radius

Pronator Quadratus

Muscles attaching to Volar Aspect

The Radius

Brachioradialis

Muscles attaching to Volar Aspect

The Radius

Brachioradialis

Muscles attaching to Volar Aspect

Posterior view

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