Generally speaking, abbreviations such as sched. or SKDs. (SKDs capitalized is mostly within military/governmental usage) will not appear in prose or similarly written texts. They are reserved for titles, headlines, shorthand notes, or other areas where space is a concern.
The pectoral girdle is an imcomplete ring because it is open in the back between what? The KGB Agent answer: The pectoral girdle is an incomplete ring because it is open in the back between the scapulae.
The pectoral and pelvic girdles are both sturdy sockets for limb articulation. The pectoral girdle is larger but does not bear much weight, while the pelvic girdle is lightweight but weight-bearing.