Glossary
CI
Cephalic Index — the ratio of head width to head length. It indicates whether the head shape tends toward brachycephaly or dolichocephaly.
Synonyms:cephalic indexcranial index
Glossary of cranial terms
Definition
CI = (head width / head length) × 100. Normal range is 78–90. >90 indicates brachycephaly (flat back of the head), <78 indicates dolichocephaly (long and narrow).