tiny muscle fibers attached to each hair follicle, which contract to make the hairs stand on end, causing goose bumps.
"Raiser of hair" - small bands of smooth muscle cells attached to hair follicles, which cause the hair to stand upright when activated.
arrector pilli
The arrector pilli does not cause shivering - it's responsible for "goosebumps".. shivering is caused by skeletal-muscles..
arrector pilli
arrector pili.
Goosebumps are caused by little muscles called the arrectores pilorum (the hair erector muscles). Contraction of these muscles elevates the hair follicles above the rest of the skin. And it is these tiny elevations we perceive as goose bumps. Source: http://www.medicinenet.com/script/main/art.asp?articlekey=6842
The Arrector Pili muscle
arrector pili
Errector Pilli Muscle
arrector pili muscle
arrector pili
These are the muscles that make your hair stand up.... goose bumps, anyone?
The arrector pili muscles makes the hairs on your arm stand on end.