Do you mean, "Where is lymph from mammary glands collected?" Most of the lymph in a human mammary gland travels, ultimately, to the apical axillary lymph nodes.
Mammary gland
Mammary gland
Mammary glands are the source of milk production in female (and some male) mammals
Mammals have mammary glands like whales
mammary alveolus
The mammary gland is an exocrine gland. It has ducts through which milk is secreted.
mammary glands produce milk in a females body
lymph gland
The breast.
Udder
Mammary gland
mammary gland.