Structure of a Tree - Timber Construction

The cross-section of a tree has several layers which differ from one tree to other. The layers include pith or medulla, heartwood, sapwood, cambium layer, medullary rays, and the bark.
The different elements constituting the structure of a tree are explained briefly below:

1. Pith or Medulla The innermost central portion that contains entire cellular tissue is called pith or medulla.

2. Heart Wood The annual rings that surround the pith are called as heartwood. This portion is dark in color and it does not take part in the growth of a tree. This part forms the strongest and durable art of a tree. 3. Sapwood The few outer annual rings are called sapwood. This part of the tree is active in growth. 4. Cambium Layer The thin layer between the bark and sapwood is termed as cambium layer. This layer contains sap which is yet to be converted into the sapwood. 5. Medullary Rays These are vertical layers of cellular tissues and are thin radial lines from plinth to the cambium layer.  6. Bark …

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