d. Cranial, Cephalic, or Superior. The terms "cranial", "cephalic", and
"superior" refer to parts that are toward the head end of the body. ("Kranion" is the
Greek word for skull and "kephalo-" is the Greek prefix for head.) It the central ray (CR)
is cephalic, toward which end of the body is it angled? You were right it you said that
the ray would be angled toward the head (figure 3-11). Let's review some of the
alternate terms for caudal and cephalic (toward the head)--the terms inferior and
superior. Take a look the inferior-superior os calcis protection shown in figure 3-12.
cranial, cephalic, or superior: refers to parts that are towards the head of the body.
Figure 3-11. If the central ray is cephalic, it is angled toward the head.
Figure 3-12. In an inferior-superior os calcis projection, the central ray enters from the
inferior portion and exit s the superior portion of the foot.