At ball and socket joints, a rounded head articulates with . On a skeleton, iden

Question

At ball and socket joints, a rounded head articulates with . On a skeleton, identify the shoulder joint. At this joint the head of the humerus articulates with the glenoid cavity Ball-and-socket joints are triaxial, allowing movements in three planes flexion and extension in the fhrst plane, abduction and adduction in the second, and medial and lateral rotation in the third. Circumduction can also be performed at these joints, From the anatomical position perform the following movements at the shoulder joint Flexion of the arm Extension of the arm Abduction of the arm Adduction of the arm Medial rotation of the arm Lateral rotation of the arm Circumduction of the arm The other ball-and-socket joint is the hip. Identify this joint on the skeleton. Notice that the head of the femur articu lates with the acetabulum of the hip bone How are the articulations of the shoulder and hip joints similar? At the hip joint perform flexion/extension, abduction/adduction, and mediallateral rotation of the thigh. How does the range of motion at the hip compare with the shoulder? MAKING CONNECTIONS List two activities that involve circumduction of the arm. How are they different? 2.

Explanation / Answer

3) similarities between shoulder and hip joint are as follows:

differences:

4)range of motion in the shoulder joint:

flexion,extension,adduction,abduction and medial roration

range of motion in the hip joint:

flexion, extension,adduction,abduction, medial and lateral roration

range of motion at the hip places an additional demand on the shoulder that lead to injury

activities which involve circumduction of the arm are :

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