<prompt> Dangerous layer of scalp:Subcutaneous layerMusculoapneurotic layerLoose subaponeurotic layerPeriosteum layer  <response>: 173. Ans. c Loose subaponeurotic layerRef: BDC 6th ed. Vol-III61-63The 5 layers of scalp can be remembered as SCALP: Skin: consist of hair follicles, sebaceous gland and sweat glands. Sub Cutaneous layer: contains blood vessels, nerves of the scalp Aponeurotic layer aka galea aponeurotica It is a tough layer of dense fibrous tissue which runs from the frontalis muscle anteriorly to the occipitalis posteriorly Loose subaponeurotic tissue containing the emissary veins and allowing free movement of layers 1 to 3 as a unit. Layer 4 is a dangerous area because it allows spread of infection even, by way of the emissary veins, to intracranial structures. Pericranium, is the periosteum of the skull bones providing nutrition. 