Layers and Anatomy of the Scalp

• The scalp is divided into layers: skin, connective tissue, aponeurosis, loose connective tissue, and pericranium.
• These layers help in maintaining the structure and function of the scalp, with the aponeurosis layer connecting the frontalis and occipitalis muscles.
• The loose connective tissue layer is crucial but is considered the "danger area" as infections can spread through emissary veins to the cranial vault.
• The pericranium layer acts as the periosteum knitted to the bone, providing protection and support to the skull bones.
• Cutaneous innervation of the scalp includes nerves like the greater occipital, lesser occipital, super orbital, super trochlear, zygomatic, and auriculotemporal nerves.
• The scalp receives its vascular supply from branches of the external and internal carotid arteries, providing rich blood flow and connections to the scalp arteries.
• Scalp lacerations bleed profusely due to the numerous anastomotic connections in the scalp, causing vessels to bleed from both ends and being kept open by the connective tissue network.

Explore the layers and anatomy of the scalp, including the skin, connective tissue, aponeurosis, loose connective tissue, and pericranium. Learn about the cutaneous innervation and vascular supply to the scalp, as well as the unique features such as profuse bleeding from scalp lacerations.