File:Doan-plate01.jpg

The Circulation of the Bone-Marrow - Plate 1

Fig. 4. Distal half of radius, pigeon 16 As, injected with india-ink (dilution 1-4). Marrow cleared in situ by the Spalteholz method. Injection very incomplete. The nutrient artery and efferent vein are seen occupying the nutrient, foramen. The longitudinal distribution of the main vessels is seen. Near the epiphysis one small artery enters the marrow cavity while several small veins emerge. There is extensive anastomosis between the medullary vessels and these extra-diaphaseal vessels. There is an indication of the venous-tuft distribution seen more distinctly in the other figures. X 10.

Fig. 5. Radius from pigeon 35 A, the marrow having been embedded and sectioned serially, 150 p. The central longitudinal vein is shown with two main venous tufts anastomosing. A branch of the longitudinal artery connects with the venous tufts by way of the "transition-capillary" link. These vessels function normally and, though few in number, appear to be the regular avenues for the passage of blood from the arterial to the venous side. XI 10.

Fig. 6. Portion of radius of pigeon 36 A, cleared with marrow in situ, showing a more extensive injection than figure 4. The venous and arterial tufts suggest a segmental distribution. The nutrient vessels of the bony cortex are seen extending into and anastomosing with the medullary vessels. X26.

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