MORPHOLOGICAL FEATURES OF BONE MARROW OF BONE ORGANS OF NEWBORN CALVES

Authors

  • Z. H. Stehney National University of Life and Environmental Sciences of Ukraine

DOI:

https://doi.org/10.31548/ujvs2019.03.004

Abstract

Studied osteoblastic, red and yellow bone marrow, bone and cartilaginous tissues and intraorganic blood vessels of some bone organs of axial and appendicular skeleton (the breastbone and the femur) of newborn calves. During the working on the topic, a complex of morphological methods of research was used. In the period of ontogenesis, the bone marrow passes the stages of osteoblastic, red and yellow, which have their morphofunctional features. Osteoblastic bone marrow is formed by osteoblasts, which are single-layered located on the bone trabeculae, which contains the remnants of destructive cartilage tissue represented by hypertrophied chondrocytes. The bone marrow cells contain straight or arcuate capillaries. Between the osteoblastic bone marrow there are the centers of hemopoiesis, the area of which increases as the transformation of the primary spongy bone tissue into the secondary one. Trabeculae of the primary spongy bone tissue and arcuate capillaries create a microenvironment for osteoblastic bone marrow. Red bone marrow has the form of cluster of myeloid and lymphoid сells, which are at different stages of differentiation and are located between reticulocytes. It fills cells of the secondary spongy bone tissue. It contains a significant number of sinusoidal hemocapillars with a diameter of 70.0-450.0 μm. Their wall is formed by endothelial cells, between which there are fenestrations for penetration of mature cells into the general blood stream (Pic. 3). Sinusoid capillaries are located predominantly at the trabeculae of spongy bone tissue. Bone trabeculae of osteoblastic bone tissue and sinusoidal capillaries are a microenvironment for the formation and functioning of the red bone marrow. The yellow bone marrow is in the bone marrow cavity of the diaphysis of the femur. It is represented by an accumulation of fat cells that are located between the red bone marrow and blood vessels of different diameters.

Keywords: osteoblastic, red, yellow bone marrow, bone and cartilaginous tissue, intraorganic blood vessels, newborn calves

 

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Published

2019-08-19

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