Myeloid tissue
Myeloid tissue, in the bone marrow sense of the word myeloid (myelo- + -oid), is tissue of bone marrow, of bone marrow cell lineage, or resembling bone marrow, and myelogenous tissue (myelo- + -genous) is any tissue of, or arising from, bone marrow; in these senses the terms are usually used synonymously, as for example with chronic myeloid/myelogenous leukemia.
In
The word myelopoiesis has several senses in a way that parallels those of myeloid, and myelopoiesis in the narrower sense is the regulated formation specifically of myeloid leukocytes (myelocytes), allowing that sense of myelopoiesis to be contradistinguished from erythropoiesis and lymphopoiesis (even though all blood cells are normally produced in the marrow in adults).
Myeloid neoplasms always concern bone marrow cell lineage and are related to hematopoietic cells. Myeloid tissue can also be present in the liver and spleen[5] in fetuses, and sometimes even in adults as well, which leads to extramedullary hematopoiesis.
There is one other sense of myeloid that means "pertaining to the spinal cord", but it is much less commonly used. Myeloid should not be confused with myelin, referring to an insulating layer covering the axons of many neurons.
See also
References
- PMID 15147715.
- ^ PMID 18295580.
- ^ "Definition of Myelogenous". MedicineNet. August 28, 2013. Retrieved 2015-09-10.
- PMID 22345399.
- ^ Semester 4 medical lectures at Uppsala University 2008 by Leif Jansson