The body is made of large and small muscles with large and small joints. The knee and hip are large joints with large muscles: the quadriceps and the hamstring. The finger joints are small and have very small muscles. Gross motor movement is performed by larger joints and muscles. Fine motor movement is performed by the small joints and muscles in the hand. As outlined in this book, gross motor is needed for fine motor development and fine motor development is needed to mature gross motor skills.
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