ACTIVITY Understanding the Types of Movements at Synovial Joints Rotational and

Question

ACTIVITY Understanding the Types of Movements at Synovial Joints Rotational and Special Movements Rotational movemeats occur around the kong axis of a bone Leftaal right rotation referto the ing of a body part to the right or le around the midline of th body Rotation of the head so signify "no" is an examgle 3 Medial (insernal) rotation ocues when the anterioe surface of the moving part is Right (external) rotation occurs when the anterior surface is beought away from the median O Perfore medial and lateral rotation of the arm At what joist do these actions occur Identify another joint where these movements Proaation and supination specifically apply to the eotation of the radius around the ulna at the proximal and distal radioulnar joints. Identity these joints on a skelleton 0 Froes the anatomical position. pronate the forearm by rotating it medially so that the palm of the hand faces posberiorly Supinate forearm by fotating i·laterally so that the palm faces anteriorly. Notice that you have returned to the anatomical position O Descrie the relationship betwees the radiua and ulna when a the forearm is promated 82

Explanation / Answer

The radius is designed in such a way that it can rotates around the ulna in wrist joint and elbow joint.

Relationship between radius and ulna during Pronation of forearm

The distal end of the radius rotates around the ulna from its position from the lateral side of the wrist to the medial side of the wrist

Relationship between radius and ulna during supination of forearm

The proximal end of the radius remains lateral to the ulna rotates around the ulna from its position from the medial side of the wrist to the lateral side of the wrist.

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