Apocrine sweat glands are sweat glands composed of a coiled secretory portion located at the junction of the dermis and subcutaneous fat, from which a straight portion inserts and secretes into the infundibular portion of the hair follicle. The ducts of apocrine glands open into the canals of hair follicles. The stimulus for the secretion of apocrine sweat glands is adrenaline, which is a hormone carried in the blood[WP]. [ http://www.ncbi.nlm.nih.gov/pubmed/18489347 http://en.wikipedia.org/wiki/Apocrine_sweat_gland ]