Rotation of arm in a full circle is possible due to:a)Hinge jointb)Piv...
The arm is joined to the shoulder girdle/ pectoral girdle by the ball and socket type of joint. The ball and socket joint is the strongest type of joint in the human body. This makes possible the rotation of the arm in a full circle.
Rotation of arm in a full circle is possible due to:a)Hinge jointb)Piv...
Ball and socket joint:
A ball and socket joint is a type of synovial joint that allows for a wide range of movement in various directions. It is formed by the rounded head of one bone fitting into the cup-shaped socket of another bone. This type of joint allows for rotation and movement in multiple planes.
Rotation of arm:
The rotation of the arm in a full circle is possible due to the ball and socket joint, specifically the shoulder joint. The shoulder joint is a prime example of a ball and socket joint, as it is formed by the head of the humerus (arm bone) fitting into the shallow socket of the scapula (shoulder blade).
Range of movement:
The ball and socket joint allows for a wide range of movement, including flexion, extension, abduction, adduction, and rotation. In the case of the arm, rotation is possible due to the ability of the head of the humerus to rotate within the socket of the scapula.
Flexion and extension:
Flexion refers to the movement of bending the arm at the elbow joint, bringing the forearm closer to the upper arm. Extension, on the other hand, refers to straightening the arm at the elbow joint, moving the forearm away from the upper arm.
Abduction and adduction:
Abduction refers to the movement of lifting the arm away from the body, moving it laterally. Adduction, on the other hand, refers to bringing the arm back towards the body, moving it medially.
Rotation:
Rotation of the arm in a full circle involves the movement of the arm around its axis. This is made possible by the ball and socket joint, as the head of the humerus can rotate freely within the socket of the scapula. This allows for movements like circling the arm in a complete rotation.
Conclusion:
In conclusion, the rotation of the arm in a full circle is possible due to the ball and socket joint. This type of joint allows for a wide range of movement, including flexion, extension, abduction, adduction, and rotation. The shoulder joint, specifically, is a prime example of a ball and socket joint, as it allows for the rotation of the arm in a full circle.