Activity 9.4 Understanding the Rotational and Special Movements A Rotatonal movt

Question

Activity 9.4 Understanding the Rotational and Special Movements A Rotatonal movtments ocucound the long azik ofa XERCIS Types of Movements at Synovial Joints Left Right O Left and right rotation refer to the turning of a body part to the right or left around the midline of the body Medial (internal) rotation occurs when the anterior surface of the moving part is brought toward the median plane. Lateral (external) rotation occurs when the anterior surface is brought away from the median plane. Lateral (external) rotation joint do these actions occur? Identify another joint where these movements occur Pronation and supination specifically apply to the rotation of the radius around the ulna at the proximal and distal radioulnar joints. Identify these joints on a skeleton. 9 From the anatomical position, pronate the forearm by rotating it medially so that the palm of the hand faces posteriorly. Supinate the forearm by rotating it laterally so that the palm faces anteriorly. Notice that you have returned to the anatomical position. 6 Describe the relationship between the radius and ulna when: a the forearm is pronated: b the forearm is supinated: 136 EXERCISE9 Articulations

Explanation / Answer

Ball and Socket joints is involved in the lateral and medial rotation of arm

6a. During pronation, the distal end of the radius rotates around the ulna(styloid process) from its position on the lateral side of the wrist to the medial side of the wrist. pronation turns the hand, wrist, and forearm almost 180 degrees so that the palm faces posteriorly or inferiorly, depending on the position of the arm.

6b. During supination the distal end of the radius moves back to its position on the lateral side of the wrist. Full supination moves the hand, wrist, and forearm almost 180 degrees so that the palm faces anteriorly or superiorly, depending on the position of the arm.

The distal end of ulna moves slightly posterolaterally during pronation and anteromedially in supination.

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