Physical growth and development follow the ____________ and _____________…

Physical growth and development in children are governed by two universal directional principles. The cephalocaudal principle states that growth and the ability to control movement proceed from the head toward the feet, a head-to-tail (top-down) direction. The proximodistal principle states that growth and motor control proceed from the central axis of the body outward toward the extremities, a centre-to-periphery (inner-to-outer) direction.

Applying this to how infants actually develop: a baby gains the ability to hold up the head and control the trunk well before gaining control over the legs and the ability to walk — this is the cephalocaudal (top-down) pattern. Likewise, a baby gains control over the shoulders and upper arms before gaining fine control over the wrists and fingers — this is the proximodistal (inner-to-outer) pattern. Together, these two directional patterns describe how physical growth spreads through the body.

The remaining options either confuse this pair of terms with an unrelated pair of principles, or assign each term the wrong direction:

• Integration and differentiation are principles describing how separate motor skills become coordinated into unified action as a child learns — they are not about the spatial direction of physical growth, so neither answers what this question asks.

• A pairing that assigns "top-down" to proximodistal and "inner-to-outer" to cephalocaudal puts each technical term with the direction that properly belongs to the other term.

Because physical growth spreads head-to-tail and centre-to-extremity, the correct pairing is cephalocaudal (top-down) and proximodistal (inner-to-outer).