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Bone tissue. Coloured scanning electron micrograph (SEM) of cancellous (spongy) bone. Bone tissue can be either cortical (compact) or cancellous. Cortical bone usually makes up the exterior of the bone, while cancellous bone is found in the interior. Cancellous bone is characterised by a honeycomb arrangement, comprising a network of trabeculae (rod-shaped tissue). These structures provide support and strength to the bone. The spaces within this tissue contain bone marrow (not seen), a ...

Bone marrow stem cell. Coloured scanning electron micrograph (SEM) of a stem cell from adult bone marrow in culture. Bone marrow is the tissue found in the hollow interior of bones. It makes several different types of cells, including white blood cells (leucocytes), red blood cells (erythrocytes) and bone cells (osteocytes). Magnification: x4310 when printed 10 centimetres wide. Credit: PAUL GUNNING/SCIENCE PHOTO LIBRARY

Bone marrow stem cell, coloured scanning electron micrograph (SEM). This cell is known as a multipotential stem cell because it can form the precursors to every type of blood cell. During blood cell development the multipotential stem cell develops by a process known as haemopoiesis into either red blood cells (erythrocytes), or one of three types of white blood cell (granulocytes, lymphocytes or monocytes). Blood cells have short lifespans and are therefore constantly produced by the bone…

Scanning electron micrograph (SEM) of cancellous (spongy) bone of the human shin. Bone tissue is either compact or cancellous. Compact bone usually makes up the exterior of the bone, while cancellous bone is found in the interior. Cancellous bone is characterised by a honeycomb arrangement of trabeculae. These structures help to provide support and strength. The spaces within this tissue normally contain bone marrow, a blood forming substance. Credit: SCIENCE SOURCE/SCIENCE PHOTO LIBRARY

Biology facts: Why not learn some new facts related to cells, DNA, cloning, natural selection, fungus, ecology, bacteria, viruses and other biology related topics.

Interior of a bone. Coloured scanning electron micrograph (SEM) of a long bone fractured to show its interior. The outer layer (pink) of the bone comprises proliferating cartilage. In the centre is spongy, or cancellous bone, which contains bone marrow (red) the site of blood cell production. Spongy bone is characterised by a honeycomb arrangement, comprising a network of trabeculae (cream, centre). The perimeter of the bone is made from thicker bone, called compact, or cortical bone.

Bone marrow. Scanning electron micrograph (SEM) of bone marrow in cancellous bone tissue. Bone tissue can be either cortical (compact) or cancellous (spongy). Cancellous bone is found in the centre of the bone and is characterised by a honeycomb arrangement, comprising a network of trabeculae (fibrous tissue). These structures provide support and strength to the bone. The spaces between the trabeculae are filled with bone marrow (purple), which produces blood cells. Differentiating white ...