<P> The composition of marrow is dynamic , as the mixture of cellular and non-cellular components ( connective tissue ) shifts with age and in response to systemic factors . In humans , marrow is colloquially characterized as `` red '' or `` yellow '' marrow ( Latin : medulla ossium rubra , Latin : medulla ossium flava , respectively ) depending on the prevalence of hematopoetic cells vs fat cells . While the precise mechanisms underlying marrow regulation are not understood , compositional changes occur according to stereotypical patterns . For example , a newborn baby 's bones exclusively contain hematopoietically active `` red '' marrow , and there is a progressive conversion towards `` yellow '' marrow with age . In adults , red marrow is found mainly in the central skeleton , such as the pelvis , sternum , cranium , ribs , vertebrae and scapulae , and variably found in the proximal epiphyseal ends of long bones such as the femur and humerus . In circumstances of chronic hypoxia , the body can convert yellow marrow back to red marrow to increase blood cell production . </P>
<P> The composition of marrow is dynamic , as the mixture of cellular and non-cellular components ( connective tissue ) shifts with age and in response to systemic factors . In humans , marrow is colloquially characterized as `` red '' or `` yellow '' marrow ( Latin : medulla ossium rubra , Latin : medulla ossium flava , respectively ) depending on the prevalence of hematopoetic cells vs fat cells . While the precise mechanisms underlying marrow regulation are not understood , compositional changes occur according to stereotypical patterns . For example , a newborn baby 's bones exclusively contain hematopoietically active `` red '' marrow , and there is a progressive conversion towards `` yellow '' marrow with age . In adults , red marrow is found mainly in the central skeleton , such as the pelvis , sternum , cranium , ribs , vertebrae and scapulae , and variably found in the proximal epiphyseal ends of long bones such as the femur and humerus . In circumstances of chronic hypoxia , the body can convert yellow marrow back to red marrow to increase blood cell production . </P>
where do you find red and yellow marrow
where do you find red and yellow marrow
bones
bones