the elbow and radioulnar joint - eastern illinois universitycfje/2440/elbow-bones.pdf · the elbow...
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The Elbow and Radioulnar Joint
Bone and ActionsChapter 6
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Terminology
Condyle – large round projection
Epicondyle – a projection located above a condyle
Fossa- hollow, depression or flattened surface
Tubercle - small round projection
*Supination – external rotation of the radius
*Pronation – internal rotation of the radius
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Radiusradial tuberosity
head
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Radiusradial tuberosity
head
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Ulna
coronoid process
trochlear (semilunar) notch
olecranon process
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Ulna 1. olecranon process
2. trochlear (semilunar) notch
3. coronoid process
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Humerus
medial epicondyle
lateral epicondyle
trochlea
capitulum
olecranon fossa
head
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Humerus
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Humerus
2. lateral epicondyle
3. capitulum
4. trochlea
5. medial epicondyle
7. olecranon fossa
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Scapula
glenoid fossa
coracoid process
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Scapula
2. glenoid fossa
1. coracoid process
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JointsHumeroulnar (elbow)
humerus (trochlea) and ulna ( trochlear notch)
hinge joint
Radioulnar
radius (head) and ulna
pivot joint
Radiohumeral
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Ligaments
Radial collateral
Ulnar collateral
Annular
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Ligaments
Ulnar collateral ligament
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ActionsFlexion and Extension
Elbow or Humeroulnar Joint
Sagittal plane
Supination and Pronation
Radioulnar
Transverse plane
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Actions
ELBOW EXTENSION ELBOW FLEXION
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Actions
Ulna
Posterior AnteriorHumerus
What is the action when an anterior muscle contracts?
What is the action when a posterior muscle contracts?
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Actions
Pronation & Supination
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PronationRadius moves medially
Ends up crossing the ulna
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SupinationRadius moves laterally
Ends up parallel to the ulna
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Neutral Position
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Actions
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Synergy between joints
Tightening a screw: supination and flexion
Loosening a screw: pronation and extension
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What positionhis right elbowin? His rightforearm? Hisleft elbow?
What positionis his rightforearm in?What is hisname?
What positionis his left elbowin?
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What positions are herright elbow and forearmin?
What positions areher left elbow andforearm in?