Post on 19-Dec-2015
The Elbow and Radioulnar JointThe Elbow and Radioulnar Joint
Bone and ActionsChapter 6
Bone and ActionsChapter 6
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
JointsHumeroulnar (elbow)
humerus (trochlea) and ulna ( trochlear notch)
hinge joint
Radioulnar
radius (head) and ulna
pivot joint
Radiohumeral
MovementsFlexion and Extension
Elbow or Humeroulnar Joint
Sagittal plane
Supination and Pronation
Radioulnar
Transverse plane
MovementsFlexion
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
Actions
Ulna
Posterior Anterior
What is the action when an anterior muscle contracts?
What is the action when a posterior muscle contracts?
MovementsPronation
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
Actions
QuickTime™ and aMicrosoft Video 1 decompressorare needed to see this picture.
QuickTime™ and aMicrosoft Video 1 decompressorare needed to see this picture.
Synergy between joints
Tightening a screw: supination and flexion
Loosening a screw: pronation and extension
What positionhis right elbowin? His rightforearm? Hisleft elbow?
What positionhis right elbowin? His rightforearm? Hisleft elbow?
What positionis his rightforearm in?What is hisname?
What positionis his rightforearm in?What is hisname?
What positionis his left elbowin?
What positionis his left elbowin?