This article records tradition as it has been passed down and reported. Its sources are not yet part of the atlas's verified catalogue.
A gland entry records one of the endocrine glands that Western esoteric tradition has mapped onto a spiritual center, most familiarly the pineal gland onto the third eye and the pituitary onto a crown or brow center, following the modern chakra system that Charles Webster Leadbeater's 1927 book The Chakras did the most to popularize among English speaking readers. Leadbeater described the chakras as subtle energy centers he reported perceiving through clairvoyant investigation, a first person esoteric account rather than a scholarly or comparative study, and an entry states that origin honestly rather than presenting his scheme as settled fact.
An entry records a gland's plain physiology, its location in the body, the hormone or hormones it secretes and its ordinary documented medical function, kept clearly separate from the chakra or subtle center a given esoteric system associates it with, since these are two different kinds of claim answering two different questions. Where Leadbeater's own text supplies a specific correspondence, an entry cites it as his documented scheme rather than as an independent medical or anatomical fact.
An entry also names which system supplies a given gland to chakra pairing when more than one exists, since later writers have not always kept Leadbeater's own specific assignments, and the correspondence itself is a modern Western synthesis assembled gradually rather than a single ancient teaching handed down whole.