Biologic Units
Ashley Davidoff MD
Copyright 2017
The Cell
The Cell
The cell is the building block of all biological structure. In this image a few polygonal cells of the liver are attached together. Each cell has a central dark nucleus which is embedded in a pinkish cytoplasm. The nucleus takes up approximately 1/5 to 1/6 of the volume of the cell. (Image courtesy of Barbara Banner M.D.) 13440
The Tissue
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Cells Align and Combine – Sinusoids – Shapes – New Unit – Tissue |
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The cells of the liver are organized in cords and plates and are organized like spokes of a wheel around the central vein. The plates and cords are lined by the sinusoids which are the channels which carry blood to the liver. Just below the sinusoids, between the wall of the sinusoid and the capsule of the liver there is a space called the space of Disse which carries the lymphatic fluid of the liver. (Image courtesy |
Tissue Units
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Tissue Aligns and Combines – Shapes – New Unit – Lobule |
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The sinusoids and hepatic cords combine to form a liver lobule which is a functional and structural unit of the liver. At the center of the lobule is the central vein from which emanate many cords of liver tissue. At the periphery of the lobule there are 4-5 groups of portal triads consisting of distal branches of the portal vein (dark blue), hepatic artery (red) and biliary radicle (green). They create the border of the lobule. (Image courtesy of Ashley Davidoff M.D.) 13009 W |
Organs
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Lobules Align and Combine – Shapes Up – New Unit – The The liver |
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The lobules of the liver combine to form lobes. The liver has two lobes. In this anatomical specimen the right lobe is seen on the left side of the image lateral to the stone containing gallbladder, while the left lobe is seen with the branching potal triad surrounded by the whitened connective tissue. on the right side of the image. (Image courtesy of Ashley Davidoff M.D.) 13456 |
Systems
| Liver aligns and Combines – Shapes Up – New Unit – The Abdomen |
| 45920.800 Courtesy Ashley Davidoff MD |
Body Parts
Completing the Abdomen – surrounding skin |
| 45883.800 Courtesy Ashley Davidoff MD |
Body
 
The Body – Parts and the whole |
| I came across this man in a store window in Washington DC I think in the spring of 1983 and it brought to mind the idea of the concept of the parts making up the whole. I show it in the context of the discussion for some light relief. Courtesy Ashley Davidoff MD 22392 02006p03 |
Person
The Young Adult – with the bigger picture in the background – part of a team |
| 72801p |
Couple
The Couple |
| 82835p.800b01 couple nude man woman TCV oneness Davidoff art |
The Family
The Wedding – The Family |
| A large family wedding with 12 children. Note the complexion of the groom is completely different to bride’s and her family. Genetics goes deeper than we know, and the good and the bad surface t intermittantly. However there is no telling when this will occur or become phenotypic.
Davidoff phtography. 68494 |
Groups
Different Groups of People |
| A collage of some of the people of South Africa. In this image there is a slight male predominance. Davidoff photography. 57728c |
Community
Community |
| 0063.800 Peru food eating restaurant Davidoff photography Davidoff MD |
The City
The City |
| 61855 Boston Zakim bridge government centre nucleus Davidoff photography |
Nations
Nations |
| Map of Europe showing with Sweden in red. There is a high incidence of sarcoidosis in the Swedish population. 54454 Image from infoplease.com http://www.infoplease.com/atlas/ 54454 |
Mother Earth
The Earth – An apparrent independant unit – but little does it know |
| 54954 Courtesy of NASA – National Space Science Data Center |