Developmental Biology 人躯体的不同部分有不同的生长速率 adult Weeks of development Age in years Fig 14.5 Different parts of the human body grow at relatively large but, with time, other parts of the body grow much different rates At 9 weeks of development, the head is more than the head. After Gray, H: 1995Developmental Biology 人躯体的不同部分有不同的生长速率