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Initially, a baby grasps the object by using his whole palm. Gradually as growth and development continues the baby uses finger and thumb to pick up the object. This type of progression is

Initially, a baby grasps the object by using his whole palm. Gradually as growth and development continues the baby uses finger and thumb to pick up the object. This type of progression is Correct Answer Proximodistal progression

Development refers to an increase in structure for better and enhanced functioning of organs. It is a wide and continuous process.

Key Points

The physiological development of the human being manifests itself in a universal and orderly process of structural change marked by two interrelated kinds of sequence: (i) the cephalocaudal and (ii) the proximodistal.

1) Cephalocandal sequence:

  • As the name indicates, it is a progression of differentiation and structural maturation from the head, through the trunk, to the extreme parts of the body.
  • This means that the infant’s brain and head grow faster and reach maturity earlier than visceral organs.
  • At birth, the head makes up over 20 percent of body length; at maturity, the ratio decreases, and head area claims only 8 percent of body length. The extreme parts are last to mature.

2) Proximodistal sequence

  • The growth of tissue and structure that is closer to the center of the body is a little faster than the maturation of tissues and systems that are located in its periphery.
  • It proceeds from centre to outward or near to the distant and from parts of the body near the center develop first then the extremities.
  • First, whole arm or leg movements are seen, then elbow and knee joint control, and finally the specialized reaching movements of the fingers.

Hint

From Mass to Specific:​

  • In the beginning, when the infant is attracted towards an object and is inclined to take hold of it, his entire body becomes locomotive.
  • Gradually, the child develops the capacity to take hold of the object, reducing the involvement of the number of limbs and their parts.
  • Thus, the reduction of involvement of parts of the body has the trend of – from larger to smaller muscles.

Hence, it becomes clear that the given development of a child is a type of Proximodistal Progression.

Confusion Points

  • Mass to specific - Gradually developing ability to isolate muscles for movement. While Pattern of development from the trunk outward to the extremities, thus sitting precedes throwing a ball is Proximodistal development. In a given Question, the pattern is shown.

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