Final answer:
The humerus glides anteriorly with shoulder horizontal adduction, facilitated by muscles like the pectoralis major and subscapularis, which are located on the anterior side of the body.
Step-by-step explanation:
The direction in which the humerus glides with shoulder horizontal adduction is anteriorly. When the shoulder performs horizontal adduction, the arm moves toward the midline of the body. The muscles involved in this movement, such as the pectoralis major and subscapularis, are located on the anterior side of the body and are responsible for pulling the humerus anteriorly as the arm is brought across the chest.
In the context of shoulder anatomy and movement, when considering the actions of muscles like the deltoids, subscapularis, and teres major, it is important to remember that horizontal adduction specifically refers to the motion of bringing the arm closer to the midline in a horizontal plane, which implies an anterior glide of the humerus within the shoulder joint.
The humerus glides anteriorly with shoulder horizontal adduction. When the arm moves horizontally across the body, the humerus slides forward in the glenoid cavity. The muscles that move the humerus anteriorly are generally located on the anterior side of the body and originate from the sternum or the anterior side of the scapula.