TY - CHAP M1 - Book, Section TI - Marrow Circulation A1 - MA, Lichtman A1 - MS, Shafer A1 - RE, Felgar A1 - N, Wang Y1 - 2017 N1 - T2 - Lichtman's Atlas of Hematology 2016 AB - Graphic Jump LocationView Full Size||Download Slide (.ppt)XII.A.001Marrow Circulation. Schematic of Marrow Circulation. The arterial flow enters the marrow through the nutrient artery. The foramen through which it flows is angulated about 45 degrees; the vessels do not enter and leave perpendicular to the bone surface. The nutrient artery bifurcates into ascending and descending arterial branches from which originate the radial arteries that either anastomose with the very small vessels in the bony cortex or terminate to form the primary venous sinuses. Note that the blood in systemic arteries supplying the periosteum can comingle with the marrow arterial circulation through the vessels in the bony canals. The venous sinuses anastomose with one another forming secondary and tertiary sinuses, ultimately becoming larger collecting sinuses that drain into the very large diameter central sinus. Thereafter, blood flows out emissary veins through the cortical foramen to enter the systemic venous circulation. Hematopoiesis occurs in the intersinusoidal spaces, sometimes referred to as the hematopoietic cords. Newly formed mature blood cells penetrate the sinus wall to enter the blood. Images XII.A.002-004 show electron micrographs of the venous circulation. SN - PB - McGraw-Hill Education CY - New York, NY Y2 - 2024/03/28 UR - hemonc.mhmedical.com/content.aspx?aid=1138039824 ER -