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[[Image:LH Bone Marrow Erythroblasts Histology.jpg|thumb|75px|'''Developing erythrocytes''' ©RVC 2008]]

[[Image:LH Bone Marrow Erythroblasts Histology.jpg|thumb|75px|'''Developing erythrocytes''' ©RVC 2008]]

<p>The haematopoietic cells produce the vast majority of blood cells in the body ([[Haematopoiesis and Blood Cells - WikiBlood#Haematopoiesis|haematopoiesis]]). In young animals this occurs in most bones in the body but in mature adults this is limited to membranous bones in the body.</p>

<p>The haematopoietic cells produce the vast majority of blood cells in the body ([[Haematopoiesis and Blood Cells - WikiBlood#Haematopoiesis|haematopoiesis]]). In young animals this occurs in most bones in the body but in mature adults this is limited to membranous bones in the body.</p>

<p>To enter circulation newly formed cells press against the sinusoid wall, temporally fusing to it and creating an opening. The cell then passes directly into the circulation and the membrane repairs itself. Mature [[Erythrocytes - WikiBlood|erythrocytes]] immediately enter circulation, however the marrow stores [[Leukocytes|leukocytes]] and consequently contains around ten times more [[Leukocytes|leukocytes]] than found in circulation</p>

<p>To enter circulation newly formed cells press against the sinusoid wall, temporally fusing to it and creating an opening. The cell then passes directly into the circulation and the membrane repairs itself. Mature [[Erythrocytes|erythrocytes]] immediately enter circulation, however the marrow stores [[Leukocytes|leukocytes]] and consequently contains around ten times more [[Leukocytes|leukocytes]] than found in circulation</p>

<p>[[Thrombopoiesis - WikiBlood#Megakaryocyte|Megakaryocytes]] reside alongside the sinusoid membrane but do not leave the tissue, rather they release their [[Thrombocytes|platelets]] and then withdraw from the membrane.</p>

<p>[[Thrombopoiesis - WikiBlood#Megakaryocyte|Megakaryocytes]] reside alongside the sinusoid membrane but do not leave the tissue, rather they release their [[Thrombocytes|platelets]] and then withdraw from the membrane.</p>