Sebaceous gland Sebaceous gland Sebaceous glands are microscopic exocrine glands in the skin that secrete an oily or waxy matter, called sebum, to lubricate and waterproof the skin and hair of mammals. In humans, they occur in the greatest number on the face and scalp, but also on all parts of the skin except the palms of the hands and soles of the feet. The type of secretion of the sebaceous glands is referred to as holocrine. In the eyelids, meibomian glands, also called tarsal glands, are a type of sebaceous gland that secrete a special type of sebum into tears. Fordyce
Anterior lingual glands Anterior lingual glands Anterior lingual glands (also called apical glands) are deeply placed seromucous glands that are located near the tip of the tongue on each side of the "frenulum linguae". They are found on the under surface of the apex of the tongue, and are covered by a bundle of muscular fibers derived from the "Styloglossus" and "Longitudinalis inferior". They are between 12 and 25 mm. in length, and approximately 8 mm. wide, and each opens by three or four ducts on the under surface of the tongue's apex. The anterior lingual glands are sometimes referred by eponymous names