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For the new study, researchers administered oxytocin to the dogs’ lacrimal gland, which is responsible for tear secretion.

Even our lacrimal surrogates in Hollywood have been turning their backs on us and toward age-defying procedures that culminate in faces that can no longer approximate our sorrow.

Next are two sets of lacrimal glands that supply the watery tears.

Tear glands, also called lacrimal glands, are a particular challenge to study, says Darlene Dartt, who studies tear production at Massachusetts Eye and Ear in Boston.

He has a rare type, “a mucoepidermoid carcinoma of the lacrimal gland,” which threatens his eyesight and his life.