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).
glenoid cavity, glenoid fossa - the concavity in the head of the scapula that receives the head of the humerus to form the shoulder joint. glenoid fossa, mandibular fossa - a deep concavity in the temporal bone at the root of the zygomatic arch that receives the condyle of the mandible.