The scalp is an area at particular risk if cut and open. The crucial fourth layer is an easy area to reach from an external injury through the scalp. Pus and blood spread easily within it, and can pass into the cranial cavity. The emissary veins do not have valves.
They open in the loose areolar tissue potentially allowing infection to be transmitted from the scalp to the cranial cavity. The layer of loose areolar tissue is known as the dangerous area of the scalp.
Loose connective tissue- the scalp is comprised of the following layers, from superficial to deep: skin, connective tissue, aponeurosis, loose connective tissue, and pericranium. If you take the first letter of each, it spells scalp. So, now that you know the order of the layers, you need to figure out which one is the danger zone-the place where infections can spread very quickly. and that layer is layer 4, the loose connective tissue. Pus or blood can spread easily in this layer, and infections in this layer can pass into the cranial cavity through emissary veins. So, infections in the loose connective tissue can pass into intracranial structures such as the brain and meninges. Although layer 2 is a connective tissue layer, too, this layer is a bit thicker and is not a place where infections can easily spread.
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