[Bhalajhi 3 rd ed 10]
Scammon's growth curve classifies body tissues into 4 types:
Each of these tissues grow at different times and rates.
- Proliferates rapidly in late childhood and reaches 200% adult size. This is an adaptation to protect children from infections.
- By the age of 18 years, lymphoid tissue undergoes involution to reach adult size.
- Grows very rapidly and reaches maximum size by 6-7 years(AIIMS-2012) of age.
- Very little growth of neural tissue occurs after 6-7 years (AIPG-14)
|General or visceral tissue (muscles, bones)|
- Exhibit and "S" shaped curve with rapid growth up to 2-3 years followed by a slow phase of growth between 3-10 years (COMED-09)
- After 10th year, a rapid phase of growth occurs terminating by the 18 - 20th years
- Shows negligible growth until puberty
- Grows rapidly at pubertal age and reaches adult size after which growth ceases.