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Forearm & Wrist Anatomy
Wrist
Skeletal Anatomy
8 carpal bones (Short)
Scaphoid
Lunate
Trapezoid
Pisiform
Triquetrium
Trapezium
Capitate
Hamate
Forearm Skeletal Anatomy
Radius
Ulna
Large Amounts of Movement
 Roughly 19 joints are found in the wrist & forearm
 Range of Motion
 Wrist Flexion = 80°
 Wrist Extension = 70°
 Wrist Ulnar Deviation = 30°
 Wrist Radial Deviation = 20°
 Pronation = 90°
 Supination = 90°
Muscles
Wrist Flexors
 Flexor Carpi Radialis
Origin: Medial Epicondyle of Humerus
Insertion: 1st & 2nd Metacarpals
 Flexor Carpi Ulnaris
Origin: Medial Epicondyle of Humerus &
Olecranon Process of Ulna
Insertion: Pisiform, Hamate, 5th metacarpal
Muscles
Wrist Extensors
 Extensor Carpi Radialis Longus
Origin: Just above Lateral Epicondyle of humerus
Insertion: 2nd metacarpal
 Extensor Carpi Radialis Brevis
Origin: Lateral Epicondyle of Humerus
Insertion: 3rd metacarpal
 Extensor Carpi Ulnaris
Origin: Lateral Epicondyle of Humerus
Insertion: 5th Metacarpal
Muscles of the Forearm
 Pronator Teres
 Origin: Medial Epicondyle & Coronoid Process of the Ulna
 Insertion: Mid 1/3 of the radius
 Pronator Quadratus
 Origin: Distal 1/3 of anterior ulna
 Insertion: Distal 1/3 of anterior radius
 Supinator
 Origin: Lateral side of the elbow (bone & ligaments)
 Insertion: Upper 1/3 of radius
Nerve Supply to the Wrist & Forearm
 Radial Nerve, Ulnar Nerve, Median Nerve