1. The Elbow and Radioulnar Joints

2. Bones Humerus Ulnar Radius trochlea of the humerus
capitulum: spherical knob on lateral side
medial and lateral epicondyle
Ulnar
Trochlear notch of ulna
Olecranon Process on posterior aspect
radial notch
coronoid process
ulnar tuberosity
Radius
Head
radial tuberosity

3. The Elbow Joint Classified as a ginglymus (hinge) joint
The ELBOW consists of 2 joints:
humeroulnar
olecranon process of the ulnar
distal aspect of humerus
radiohumeral
radial head has small amount of articulation with humerus (capitulum)

4. Proximal Radioulnar Joint
articulation between radius and ulnar
not part of “hinge” joint
trochoid (pivot) joint
allows for forearm pronation/supination

5. Movements Elbow Forearm movements about the Proximal Radioulnar joint
Flexion
Extension
Forearm movements about the Proximal Radioulnar joint
Supination: Lateral rotation
Pronation: Medial Rotation

6. Muscles Posterior Triceps brachii Anconeus Supinator Anterior
Biceps brachii
Brachialis
Brachioradialis
Pronator teres
Pronator quadratus
Posterior
Triceps brachii
Anconeus
Supinator

7. Muscles Elbow Flexors biceps brachii brachialis brachioradialis
pronator teres

8. Muscles Elbow Extensors Forearm Pronators triceps brachii anconeus
pronator teres
pronator quadratus
brachioradialis*

9. Muscles
Forarm Supinators
supinator
biceps brachii
brachioradialis*

10. Anconeus (p56) Origin Insertion Action
posterior surface of lateral epicondyle of humerus
Insertion
ulna, posterior surface of olecranon process
Action
elbow extension

11. Biceps Brachii (p 57)
Origin:
long head: supraglenoid tubercle
short head: coracoid process
Insertion
radial tuberosity
Action: elbow flexion, supination, (weak shoulder flexor)

12. Brachialis (p58) Origin Insertion Action
Lower portion of anterior surface of humerus
Insertion
coronoid process of ulna
ulna tuberosity
Action
elbow flexion (‘true’ flexor)

13. Brachioradialis (p59) Origin Insertion Action
upper 2/3 of lateral supracondylar ridge of humerus
Insertion
styloid process of radius
Action
elbow flexion
supination (from pronated position to neutral)
*pronation (from supinated position to neutral)

14. Pronator Quadratus (p60)
Origin
ulna, anterior-distal fourth aspect
Insertion
radius, anterior-distal fourth
Action
pronation

15. Pronator teres (p61) Origin Insertion Action
humerus, medial epicondyle
ulna, cornoid process
Insertion
radius, middle third, lateral surface
Action
pronation
elbow flexor

16. Supinator (p62) Origin Insertion Action Humerus, lateral epicondyle
Ulna, supinator crest of ulna
Insertion
radius, lateral surface, upper 1/3
Action
supination

17. Triceps Brachii (p63) Origin Insertion
long head: scapula, infraglenoid tubercle
lateral head: humerus, 1/3 lagteral-posterior surface
medial head: humerus, lower 3/4 of posterior surface
Insertion
olecranon process of ulna
Action
All heads: elbow extension
Long head: arm extension, arm adduction

18. Summary Elbow and Proximal Radioulnar Joints Bones Actions
Humerus, ulna, radius
Actions
Elbow (about humeralulnar joint)
flexion, extension
Forearm (about Proximal Radioulnar joint)
pronation, supination