the power is in your hands…ulna and radius serve as distal attachments for these same muscles...
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The Power is in Your Hands
http://www.handsonlineeducation.com/Classes/K4/k4entry.htm[3/23/18, 1:29:53 PM]
Main Menu
1 The Elbow and RadioulnarJoints
click here
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The Power is in Your Hands
http://www.handsonlineeducation.com/Classes/K4/k4pg1.htm[3/23/18, 1:30:10 PM]
Bones
Ulna is much larger proximally than radius
Radius is much larger distally than ulna
Scapula and humerus serve as proximal attachments for muscles that flex & extend the elbow
Ulna and radius serve as distal attachments for these same muscles
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The Power is in Your Hands
http://www.handsonlineeducation.com/Classes/K4/k4pg2.htm[3/23/18, 1:30:25 PM]
Bones
Copyright 2007 McGraw-Hill Higher Education. All rights reserved.
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The Power is in Your Hands
http://www.handsonlineeducation.com/Classes/K4/k4pg3.htm[3/23/18, 1:30:38 PM]
Bones
Ulna is much larger proximally than radius
Radius is much larger distally than ulna
Scapula and humerus serve as proximal attachments for muscles that flex & extend the elbow
Ulna and radius serve as distal attachments for these same muscles
Scapula, humerus, and ulna serve as proximal attachments for muscles that pronate and supinate theradioulnar joints
Distal attachments of radioulnar joint muscles are located on radius
Bony Landmarksmedial condyloid ridge
olecranon processcoranoid processradial tuberosity
Bony Landmarks for Wrist and Hand Musclesmedial epicondylelateral epicondyle
lateral supracondylar ridge
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The Power is in Your Hands
http://www.handsonlineeducation.com/Classes/K4/k4pg4.htm[3/23/18, 1:30:51 PM]
Bones
Copyright 2007 McGraw-Hill Higher Education. All rights reserved.
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The Power is in Your Hands
http://www.handsonlineeducation.com/Classes/K4/k4pg5.htm[3/23/18, 1:31:03 PM]
Bones
Copyright 2007 McGraw-Hill Higher Education. All rights reserved.
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The Power is in Your Hands
http://www.handsonlineeducation.com/Classes/K4/k4pg6.htm[3/23/18, 1:31:16 PM]
Joints
Ginglymus or hinge-type joint
Allows only flexion and extension
2 interrelated joints
humeroulnar joint
radiohumeral joints
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The Power is in Your Hands
http://www.handsonlineeducation.com/Classes/K4/k4pg7.htm[3/23/18, 1:31:29 PM]
Elbow Motions
Primarily involves movement between articular surfaces of humerus and ulna
specifically humeral trochlear fitting into ulna trochlear notch
radial head has a relatively small amount of contact with capitulum of humerus
As elbow reaches full extension, olecranon process is received by olecranon fossa
increased joint stability when fully extended
As elbow flexes 20 degrees or more, its bony stability is unlocked, allowing for more side-to-side laxity
Stability in flexion is more dependent on the lateral (radial collateral ligament) and the medial or (ulnarcollateral ligament)
Ulnar collateral ligament is critical in providing medial support to prevent elbow from abducting whenstressed in physical activity
Many contact sports and throwing activities place stress on medial aspect of joint, resulting ininjury
Radial collateral ligament provides lateral stability & is rarely injured
Annular ligament provides a sling effect around radial head for stability
Elbow moves from 0 degrees of extension to 145 to 150 degrees of flexion
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The Power is in Your Hands
http://www.handsonlineeducation.com/Classes/K4/k4pg8.htm[3/23/18, 1:31:41 PM]
Joints
Copyright 2007 McGraw-Hill Higher Education. All rights reserved.
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The Power is in Your Hands
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Joints
Copyright 2007 McGraw-Hill Higher Education. All rights reserved.
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The Power is in Your Hands
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Copyright 2007 McGraw-Hill Higher Education. All rights reserved.
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The Power is in Your Hands
http://www.handsonlineeducation.com/Classes/K4/k4pg11.htm[3/23/18, 1:32:23 PM]
Radioulnar Joint
Trochoid or pivot-type joint
Radial head rotates around at proximal ulna
Distal radius rotates around distal ulna
Annular ligament maintains radial head in its joint
Joint between shafts of radius and ulna held tightly together between proximal and distal articulations by aninterosseus membrane (syndesmosis)
substantial rotary motion between the bones
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The Power is in Your Hands
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Synergy between Glenohumeral, Elbow, and Radioulnar Joint Muscles
As the radioulnar joint goes through its ROM, glenohumeral & elbow muscles contract to stabilize or assist inthe effectiveness of movement at the radioulnar joints
Ex. when tightening a screw with a screwdriver which involves radioulnar supination, we tend toexternally rotate and flex the glenohumeral and elbow joints, respectfully
Conversely, when loosening a tight screw with pronation, we tend to internally rotate & extend the elbow &glenohumeral joints, respectfully
we depend on both the agonists and antagonists in the surrounding joints to assist in anappropriate amount of stabilization and assistance with the required task
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The Power is in Your Hands
http://www.handsonlineeducation.com/Classes/K4/k4pg13.htm[3/23/18, 1:32:49 PM]
Movement
Flexion
movement of forearm to shoulder by bending the elbow to decrease its angle
Extension
movement of forearm away from shoulder by straightening the elbow to increase its angle
Pronation
internal rotary movement of radius on ulna that results in hand moving from palm-up to palm-down position
Supination
external rotary movement of radius on ulna that results in hand moving from palm-down to palm-up position
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The Power is in Your Hands
http://www.handsonlineeducation.com/Classes/K4/k4pg14.htm[3/23/18, 1:33:03 PM]
Movement
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The Power is in Your Hands
http://www.handsonlineeducation.com/Classes/K4/k4pg15.htm[3/23/18, 1:34:17 PM]
Movement
Copyright 2007 McGraw-Hill Higher Education. All rights reserved.
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The Power is in Your Hands
http://www.handsonlineeducation.com/Classes/K4/k4pg16.htm[3/23/18, 1:34:48 PM]
Movement
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The Power is in Your Hands
http://www.handsonlineeducation.com/Classes/K4/k4pg17.htm[3/23/18, 1:35:03 PM]
Movement
Copyright 2007 McGraw-Hill Higher Education. All rights reserved.
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The Power is in Your Hands
http://www.handsonlineeducation.com/Classes/K4/k4pg18.htm[3/23/18, 1:35:16 PM]
Muscles
Anterior
Primarily flexion and pronation
Biceps brachii
Brachialis
Brachioradialis
Pronator teres
Pronator quadratus
___________________________________
Posterior
Primarily extension and supination
Triceps brachii
Anconeus
Supinator
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The Power is in Your Hands
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Anterior Muscles
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The Power is in Your Hands
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Biceps Brachii Muscle
Flexion of elbow
Supination of forearm
Weak flexion of shoulder joint
Weak abduction of shoulder joint when externallyrotated
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The Power is in Your Hands
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Brachialis Muscle
True Flexion of muscle
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The Power is in Your Hands
http://www.handsonlineeducation.com/Classes/K4/k4pg22.htm[3/23/18, 1:36:11 PM]
Brachioradialis Muscle
Flexion of muscle
Pronation from supinated position to neutral
Supination from pronated position to neutral
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The Power is in Your Hands
http://www.handsonlineeducation.com/Classes/K4/k4pg23.htm[3/23/18, 1:36:26 PM]
Triceps Brachii Muscle
All heads:
extension of elbow
Long head:
extension of shoulder joint;
adduction of shoulder joint
horizontal abduction
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The Power is in Your Hands
http://www.handsonlineeducation.com/Classes/K4/k4pg24.htm[3/23/18, 1:36:39 PM]
Anconeus Muscle
Extension of elbow
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The Power is in Your Hands
http://www.handsonlineeducation.com/Classes/K4/k4pg25.htm[3/23/18, 1:36:52 PM]
Pronator Teres Muscle
Pronation of Forearm
Weak Flexion of Elbow
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The Power is in Your Hands
http://www.handsonlineeducation.com/Classes/K4/k4pg26.htm[3/23/18, 1:37:11 PM]
Pronator Quadratus Muscle
Pronation of Forearm
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The Power is in Your Hands
http://www.handsonlineeducation.com/Classes/K4/k4pg27.htm[3/23/18, 1:37:25 PM]
Supinator Muscle
Supination of Forearm
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The Power is in Your Hands
http://www.handsonlineeducation.com/Classes/K4/k4pg28.htm[3/23/18, 1:37:37 PM]
Elbow Flexion
Agonists
Biceps brachii
Brachialis
Brachioradialis
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The Power is in Your Hands
http://www.handsonlineeducation.com/Classes/K4/k4pg29.htm[3/23/18, 1:37:51 PM]
Elbow Extension
Agonists
Triceps Brachii: Anconeus
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The Power is in Your Hands
http://www.handsonlineeducation.com/Classes/K4/k4pg30.htm[3/23/18, 1:38:03 PM]
Radioulnar Pronation
Agonists
Pronator teres
Pronator quadratus
Brachioradialis
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The Power is in Your Hands
http://www.handsonlineeducation.com/Classes/K4/k4pg31.htm[3/23/18, 1:38:16 PM]
Radioulnar Supination
Agonists
Biceps brachii
Supinator muscle
Brachioradialis
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