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 pelvic girdle is made up of three major joints: The two 'sacroiliac joints' formed by the base of the spine and the iliac bones of the pelvis, and the 'symphysis pubis' which is found at the front and centre of the pelvic ring.