The Elbow

1
The Elbow

• Chapter 6

2
Overview

• Bony anatomy
• Joints at the elbow
• Movements at the elbow
• Muscular anatomy

3
Bony Anatomy

• Humerus
• Medial lateral epicondyles
• Capitulum
• Trochlea

4
Bony Anatomy

• Radius
• Lateral (thumb side)
• Radial head
• Radial (biceps) tuberosity

5
Bony Anatomy

• Ulna
• Olecranon process
• Coronoid process
• Ulnar tuberosity

6
Bony Anatomy

• Ulna
• Radius
• Crosses over ulna during pronation

7
Joints at the Elbow

• Humeroulnar
• Ginglymus
• Hinge
• Which plane/axis?
• Olecranon process of ulna provides stability in
  extension, but does not lock into olecranon
  fossa of humerus

8
Joints at the Elbow

• Radioulnar
• Trochoid
• Pivot
• Which plane/axis?
• Annular ligament encircles radial head but allows
  the radius to spin (pronate supinate)

9
Movements at the Elbow

• Flexion and extension at the humeroulnar joint

10
Movements at the Elbow

• Pronation and supination at the radioulnar joint

11
Muscular Anatomy

• Anterior group
• Biceps brachii
• Brachialis
• Brachioradialis
• Pronator teres
• Pronator quadratus
• Posterior group
• Triceps
• Anconeus
• Supinator

12
Anterior Group Biceps Brachii

• O LH-Superior glenoid SH-Coracoid
• I Radial tuberosity
• A Elbow flexion supination, shoulder flexion
• N Musculocutaneous

13
Anterior Group Brachialis

• O Distal humerus
• I Proximal ulna
• A Elbow flexion
• N Musculocutaneous

14
Anterior Group Brachioradialis

• O Lateral distal humerus
• I Distal radius at the lateral styloid process
• A Elbow flexion
• N Radial

15
Anterior Group Pronator Teres

• O Medial distal humerus (condyle) ulna
• I Lateral radius, middle 1/3
• A Elbow pronation flexion
• N Median

16
Anterior Group Pronator Quadratus

• O Distal anterior ulna
• I Distal anterior radius
• A Pronation
• N Median

17
Posterior Group Triceps Brachii

• O LoH- infraglenoid lip of scapula LaH-
  posterior humerus MH- medial posterior humerus
• I Olecranon process
• A Elbow extension, shoulder extension
• N Radial

18
Posterior Group Anconeus

• O Posterior humerus, lateral condyle
• I Olecranon process
• A Elbow extension
• N Radial

19
Posterior Group Supinator

• O Lateral epicondyle of humerus
• I Lateral proximal radius
• A Supination
• N Radial

20
Lab Activity

• Palpate and list the muscles primarily
  responsible for the following movements
• Flexion
• Extension
• Pronation
• Supination

21
Lab Activity

• List the plane and respective axis in which each
  of the following elbow and radioulnar joint
  movements occurs.
• Flexion
• Extension
• Pronation
• Supination

22
Lab Activity

• Discuss the difference between chinning with the
  palms toward the face and chinning with the palms
  away from the face. Consider this muscularly and
  anatomically.

23
Lab Activity

• Form your own muscle action/innervation
  spreadsheet