Clinical anatomy/clinical questions : head and neck: scalp : Why 4th layer of scalp (loose areolar tissue) is known as ‘dangerous layer of scalp’-explain anatomically?

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Why 4^th layer of scalp (loose areolar tissue) is known as ‘dangerous layer of scalp’-explain anatomically?

The sub-aponeurotic loose areolar connective tissue layer is known as dangerous layer of scalp because the blood and pus tend to collect in this layer and as it contains the emissary veins (which connect veins of scalp to intracranial dural venous sinuses), the infection from this layer may travel readily along the emissary veins into the intracranial venous sinuses.