These are also known as "hair muscles". These are tiny muslces that are attached to the hair shaft. These muscles cause the hair to stand up or be erect. When the Arrector Pili muscles contract due to stress, fear or other nervous conditions, the hair becomes stiff and will actually "stand on end".
Daily Hair Tip
Choose a hairstyle that specifically suits your face shape, hair type, texture and lifestyle. Never choose a hairstyle for a popular celebrity or for the hair trend of the moment. Celebrity and fashion hair styles change rapidly leaving you with yesterday's style.