sentences:  The apocrine gland is made up of a glomerulus of secretory tubules and an excretory duct that opens into a hair follicle; on occasion, an excretory duct opens to the skin surface next to the hair.The gland is large and spongy, located in the subcutaneous fat deep in the dermis, and has a larger overall structure and lumen diameter than the eccrine sweat gland.The secretory tubules of apocrine glands are single layered, but unlike the eccrine secretory tubules, contain only a single type of ductal epithelial cell, varying in diameter according to their location, and sometimes branching off into multiple ducts.