Unit
Notes - 3
10. Anatomic
sites vs age for hematopoiesis:
Fetus =
Liver, spleen,
thymus, bone marrow, and lymph nodes
2nd week =
Yolk sac
2nd month =
Liver and
spleen
At birth =
Bone marrow –
all areas
Children =
Bone marrow –
all areas
>18 years =
Flat bones of
bone marrow only; skull, clavicle, ribs, vertebrae, pelvis, and
ends of long bones
11. Extramedullary hematopoiesis is :
Hematopoiesis
occuring outside of bone marrow in areas such as: liver and spleen