The scalp is the part of the head that extends from the superciliary arches anteriorly to the external occipital protuberance and superior nuchal lines posteriorly. Laterally it continues inferiorly to the zygomatic arch.
The scalp is a multilayered structure with layers that can be defined by the word itself:
S—skin,
C—connective tissue (dense),
A—aponeurotic layer,
L—loose connective tissue, and