What is the myelin sheath and how does it relate to the cephalocaudal and proximodistal directions of motor skill development? Describe the sequence of motor milestones related to each direction.
What will be an ideal response?
Ans: The myelin sheath. The myelin sheath is a fatty coating that wraps around the nerves to ensure that the chemical messages sent between neurons are delivered efficiently. The myelin sheath is set down in the nervous system in the body in two directions: from the head downward, referred to as the cephalocaudal direction, and from the torso out to the extremities of fingers and toes, referred to as a proximodistal direction. Infants gain control of their bodies in a sequence that reflects these patterns of myelination.
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What will be an ideal response?
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