Final answer:
Scalp massage stimulates blood circulation in the scalp, promoting relaxation and potential hair health benefits, but does not directly act on the hair matrix or affect the cortex.
Step-by-step explanation:
Scalp massage involves manipulations performed on the scalp to relax the muscles and stimulate blood circulation. This practice does not directly act on the hair matrix or the hair shaft, but by enhancing circulation, it can provide nutrients more effectively to the follicles, potentially promoting hair health. Additionally, scalp massages can lead to a state of relaxation by easing muscle tension and may benefit the peripheral nervous system. It is not specifically aimed at affecting the sympathetic nervous system or the cortex.