Sebaceous gland the hair shaft. The structure consisting of hair, hair follicle, arrector pili muscles, and sebaceous gland is an epidermal invagination known as a "pilosebaceous unit". Sebaceous glands are also found in hairless areas (glabrous skin) of the eyelids, nose, penis, labia minora, the inner mucosal membrane of the cheek, and nipples. Some sebaceous glands have unique names. Sebaceous glands on the lip and mucosa of the cheek, and on the genitalia, are known as Fordyce spots, and glands on the eyelids are known as meibomian glands. Sebaceous glands of the breast are also known as Montgomery's glands. Sebaceous glands are
Anterior lingual glands such as: 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