Question

Take your arm and hold it straight out to the side. Now place your hand on top of your head. Again, you will write a few sentences about this movement and these body parts. In your description, include three muscles, three bones, and three regions of the body that are inferior inferior to your hand. Identify the plane of movement that your hand moved on to touch the top of your head, and research whether your elbow uses flexion or extension to accomplish this movement; include these facts in your description.

Answer 1

Arm abduction involves muscles like the deltoid and trapezius, moving in the frontal plane. Bones like the humerus and scapula are engaged. The elbow uses flexion during the action, bringing the hand closer to the head.

The movement involves abduction of the arm as it is held straight out to the side and then elevated to touch the top of the head. Three muscles involved in this movement are the deltoid, trapezius, and supraspinatus. The bones associated with this action include the humerus, scapula, and clavicle. Three regions of the body that are inferior to the hand during this movement are the shoulder, upper arm, and neck.

The plane of movement that the hand follows is the frontal (coronal) plane, as it moves away from the midline of the body during abduction. The elbow primarily uses flexion during this movement, allowing the hand to reach the top of the head. Flexion occurs when the angle between the forearm and upper arm decreases, bringing the hand closer to the head in this case.