7. 4 Each pectoral girdle consists of a clavicle and a scapula

summarize the two factors that this mobility is due to:

1.) Because only the clavicle attaches to the axial skeleton, the scapula can move quite freely across the thorax, allowing the arm to move with it. 2.)The socket of the shoulder joint (the scapula's glenoid cavity) is shallow and poorly reinforced, so it does not restrict the movement of the humerus (arm bone). Although this arrangement is good for flexibility, it is bad for stability—shoulder dislocations are fairly common.

what do the pectoral girdles attach and provide?

attach the upper limbs to the axial skeleton and provide attachment points for many of the muscles that move the upper limbs

what does the pectoral girdle consist of?

clavicle and scapula

does the pectoral girdle allow a high degree of mobility?

no

what is another name for the pectoral girdle?

shoulder girdle