Gaois

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  1. SOCIAL QUESTIONS|health|medical science

    #653048

    IATE #3562490
    ceallacht smeara Reference Faomhadh an téarma seo mar chuid de Thionscadal Lex
    ga
    bone marrow cellularity
    en
    Definition the amount or percentage of hematopoietic cells relative to marrow fat Reference "U.S. Department of Health and Human Services. NTP Nonneoplastic Lesion Atlas. Bone Marrow – Hypercellularity, [Erythroid, Granulocytic, Megakaryocytic]. National Toxicology Program, http://ntp.niehs.nih.gov/nnl/hematopoietic/bone_marrow/hypercel/bone_marrow-hypercellularity_508.pdf [14.10.2014]"
    Comment Cellularity is age dependent  —  in newborns, all marrow is hematopoietic (shows 100% cellularity), with age hematopoiesis diminishes, and the amount of fat increases. In adults hematopoiesis takes place in axial skeleton only. Long bones contain only white (fatty) marrow with no hematopoiesis taking place (except proximal parts of the humerus and femur).Normal cellularity of an adult hematopoietic bone marrow ranges between 30 – 70% and changes under pathological conditions  —  we talk of hypercellular (over 70%), normocellular (30 – 70%) or hypocellular (under 30%) bone marrow.Under pathological conditions hematopoiesis may also expand into long bones of the limbs and even out of the marrow (into the liver, spleen and other organs).