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.
Credit: Steve Jurvetson CC-BY 2.0. The pectoral girdle includes the clavicles and scapulae, and it connects the upper arms to the axial skeleton. There is no anatomical joint between the scapula and the rib cage, but rather a connection made up of muscle and ligament. This allows for a greater range of mobility and flexibility. The pelvic girdle consists of the hip bones, the sacrum and the coccyx.