Correct Answer: Scapula protraction at the scapulothoracic joint.

Scapula protraction refers to the movement of the shoulder blade (scapula) away from the spine, toward the front of the body.

This movement is also known as scapular abduction or anterior scapular tilt.

The joint involved in scapula protraction is the scapulothoracic joint, which is not a true joint, but rather a functional joint formed by the articulation between the scapula and the thorax.

The scapula is a flat bone that glides over the back of the ribcage, allowing for a wide range of movements of the arm.

Other movements of the scapulothoracic joint include:

Scapula retraction: This refers to the movement of the shoulder blade towards the spine, away from the front of the body.

This movement is also known as scapular adduction or posterior scapular tilt.

Scapula elevation: This refers to the movement of the shoulder blade upwards towards the ears.

This movement is also known as the upward rotation of the scapula.

Scapula depression: This refers to the movement of the shoulder blade downwards towards the feet.

This movement is also known as a downward rotation of the scapula.

Scapula upward tilt: This refers to the movement of the upper border of the shoulder blade upwards, towards the head.

This movement is also known as superior scapular rotation.

Scapula downward tilt: This refers to the movement of the upper border of the shoulder blade downwards, towards the feet.

This movement is also known as inferior scapular rotation.

All of these movements are important for proper shoulder function and are necessary for a wide range of daily activities, such as reaching, lifting, pushing, and pulling.