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list types of bone marrow - Coggle Diagram
list types of bone marrow
1
Types of Bone Marrow
Bone marrow is the soft tissue inside bones, found in:
Medullary canals of long bones
Small cavities of spongy (cancellous) bone
There are two main types of bone marrow:
1) Red Bone Marrow (Active)
Functions:
Makes blood cells (hemopoiesis)
Found in newborns (all bone marrow is red at birth)
Stays active in some adult bones like:
Sternum
Ribs
Vertebrae
Pelvis
Ends of long bones (femur, humerus)
Structure
1-Contains:
Stroma (supportive meshwork)
Hemopoietic cells (blood-forming cells)
Sinusoidal capillaries (leaky blood vessels)
Stromal cells = Specialized fibroblasts (support blood cell formation)
2
Matrix contains:
Collagen type I, III
Proteoglycans
Fibronectin
Laminin
Capillaries are:
Discontinuous, with gaps to allow mature blood cells to exit
4-Regulation:
Releasing factors control when mature blood cells exit the marrow, based on body’s needs (e.g. infection, blood loss)
2) Yellow Bone Marrow (Inactive)
Features:
Color: Yellow due to fat (adipose tissue)
Found in older individuals
Does NOT normally produce blood cells
Conversion:
In emergencies (like severe bleeding or low oxygen/hypoxia),
👉 Yellow marrow can revert back to red to make more blood cells.
Mini Summary to Memorize:
"Red marrow makes blood cells and is active; yellow marrow stores fat but can turn red in emergencies."