Practice: This cartilage is tough and functions to cushion and add stability to the joint. Fill in the blank Definition: Answer the following questions. Enter the medical terms for the following layman's terms. Fill in the blanks. collarbones Fill in the blank Practice: Bone diseases can strike at any age. Refer to the text regarding diseases of the bone for the correct terminology to identify each disease. Fill in the blanks. Rare, genetic disorder causing brittle bones Fill in the blank.