Vegetation acts as an interface between the atmosphere and the soil. It increases the permeability of the soil to rainwater, thus decreasing runoff. It shelters the soil from winds, which results in decreased wind erosion, as well as advantageous changes in microclimate.
The shoulder is a ball-and-socket type of joint and is anatomically referred to as the gleno-humeral joint, describing the two bony structures involved. The socket is the glenoid cavity, a cup-shaped piece of bone that juts out from a corner of the shoulder blade (scapula).
The shoulder joint is a synovial joint of the ball and socket variety. There is a 4 to 1 disproportion between the large round head of the humerus and the small shallow glenoid cavity. The glenoid labrum, a ring of fibrocartilage attached to the margins of the glenoid cavity, deepens slightly but effectively the depression of the glenoid âfossaâ.