Arrector pili muscles stomach have in common with the blood vessels.
The appendageal structures of the skin include the hair follicle, sebaceous gland, the apocrine gland, and the arrector pili muscle (APM), these structures are all located in the dermis and are functionally and anatomically related.
The contraction of these muscle are involuntary, in response to Stresses such as cold, fear .Thick skin also contains no arrector pili muscles, which cause goosebumps. Thick skin is thicker because it contains an extra layer in the epidermis, called the stratum lucidum.
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