The adult skeleton possesses 2 types of bone marrow: yellow and red. Yellow marrow has undergone adipose involution and is inactive. The red marrow possesses hematopoietic cells as well as 2 known populations of adult stem cells.1 Hematopoietic stem cells give rise to all cell components of circulating blood, such as erythrocytes, lymphocytes, neutrophils, and thrombocytes. The other stem cell population consists of mesenchymal stem cells (MSCs), which are also known as marrow stromal cells. MSCs have the potential to differentiate into connective tissue cells such as osteoblasts, osteocytes, adipocytes, and chondrocytes.
bone marrow stem cells
These findings serve as a proof of concept for the ability of residual quiescent follicles of damaged ovaries to produce competent oocytes in an adequate ovarian environment but should not be restricted to the limited population of young cancer patients. In fact, a small pool of dormant primordial follicles remains even in the non-functional ovaries of menopausal women and patients diagnosed with premature ovarian insufficiency due to several causes.