Original: It is a tough layer of dense fibrous tissue which runs from the frontalis muscle anteriorly to the occipitalis posteriorly L: The loose areolar connective tissue layer provides an easy plane of separation between the upper three layers and the pericranium.
Simplified: It is a tough layer of dense fibrous tissue L: The loose areolar connective tissue layer provides an easy plane of separation between the upper three layers and the pericranium.