Brummet's Conscious Blog

The 5 Layers of a Tree Trunk * By Sarabeth Kluzinnski The anatomy of a tree would truly interest even the most apathetic person. That is because trees are complex parts of nature that provide an infinite list of benefits and an even larger amount of value! There are thousands of tree species in the world, all in different shapes, sizes, colors, yields, and more. But one thing they all have in common: a trunk. All trees, both deciduous and coniferous, have a tree trunk in some form or another. And one of the most interesting facts about tree trunks is that they have 5 different layers! As mentioned, tree trunks have 5 separate layers to them. They are the outer bark, inner bark (phloem), the cambium cell layer, sapwood, and heartwood. Each layer has their very own purpose, but overall, the trunk's primary job is to protect and support the tree. Look below to review each layer and what they do. Like a shield, a trunk's outer bark is there to protect the tree from i...