The document discusses cephalocaudal gradient of growth, which refers to the head-to-toe axis of increased growth during development. It begins in the head region and progresses down the body. Physical control follows the order of head, arms, then legs. The proportions of the head and face also change with growth. Terminologies covered include growth, development, endochondral ossification, intramembranous ossification, growth sites, growth centers, remodeling, growth movements, and displacements. Growth involves increasing size and complexity, while development is the progress towards maturity.