1 / 18

The Elbow and Radioulnar Joints

The Elbow and Radioulnar Joints. Bones. Humerus 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

alban
Download Presentation

The Elbow and Radioulnar Joints

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript


  1. The Elbow and Radioulnar Joints

  2. Bones • Humerus • 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 • Proximal radioulnar joint • articulation between radius and ulnar • not part of “hinge” joint • trochoid (pivot) joint • allows for forearm pronation/supination

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

  6. Muscles • 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 • triceps brachii • anconeus • Forearm Pronators • pronator teres • pronator quadratus • brachioradialis*

  9. Muscles • Forarm Supinators • supinator • biceps brachii • brachioradialis*

  10. Anconeus (p56) • Origin • 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 • Lower portion of anterior surface of humerus • Insertion • coronoid process of ulna • ulna tuberosity • Action • elbow flexion (‘true’ flexor)

  13. Brachioradialis (p59) • Origin • 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 • humerus, medial epicondyle • ulna, cornoid process • Insertion • radius, middle third, lateral surface • Action • pronation • elbow flexor

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

  17. Triceps Brachii (p63) • Origin • 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 • Humerus, ulna, radius • Actions • Elbow (about humeralulnar joint) • flexion, extension • Forearm (about Proximal Radioulnar joint) • pronation, supination

More Related