Referring to the head:
* The cephalic region of the body is responsible for many vital functions.
* The cephalic presentation of the fetus is the most common during childbirth.
* A cephalic injury can be quite serious.
Referring to the head end of a body:
* The cephalic end of the worm contains its sensory organs.
* In some species, the cephalic region is highly specialized for feeding.
* The cephalic ganglion of the insect is its brain.
Figuratively:
* He's got a cephalic obsession with winning, always focusing on his goals.
Remember that "cephalic" is a formal word, so it's best to use it in scientific or medical contexts. In everyday speech, you would more likely use "head" or "cranial."