QUOTE(Livyjr @ Apr 14 2007, 06:02 PM)
This inner eye has a location, buried deep in the brain.
When it is opened, it is our way of receiving more subtle experiences than we receive in our physical states.
Perhaps looking and seeing are misleading terms, after all.
We don't necessarily "see" images through this inner eye.
We gain direct awareness that is beyond the image.
- Deng, Ming-Dao
Pineal glandFrom Wikipedia, the free encyclopedia
The pineal gland (also called the pineal body or epiphysis) is a small endocrine gland in the brain.
It is located near the center of the brain, between the two hemispheres, tucked in a groove where the two rounded thalamic bodies join.
LocationThe pineal gland is a reddish-gray body about the size of a pea (8 mm in humans), located just rostro-dorsal to the superior colliculus and behind and beneath the stria medullaris, between the laterally positioned thalamic bodies.
It is part of the epithalamus.
The pineal gland is a midline structure, and is often seen in plain skull X-rays, as it is often calcified.Structure and compositionThe pineal body consists in humans of a lobular parenchyma of pinealocytes surrounded by connective tissue spaces.
The glands' surface is covered by a pial capsule.
The pineal gland consists mainly of pinealocytes, but four other cell types have been identified.
The pineal gland is the only brain structure that does not come in pairs.Cell type Description The pinealocytes consist of a cell body with 4-6 processes emerging.
They produce and secrete melatonin.
The pinealocytes can be stained by special silver impregnation methods.
Interstitial cells are located between the pinealocytes.
Many capillaries are present in the gland, and perivascular phagocytes are located close to these blood vessels.
The perivascular phagocytes are antigen presenting cells.
In higher vertebrates neurons are located in the pineal gland. However, these are not present in rodents.
In some species, neuronal-like peptidergic cells are present.
These cells might have a paracrine regulatory function.
The pineal gland receives a sympathetic innervation from the superior cervical ganglion.
However, a parasympathetic innervation from the sphenopalatine and otic ganglia is also present.
Further, some nerve fibers penetrate into the pineal gland via the pineal stalk (central innervation).
Finally, neurons in the trigeminal ganglion innervates the gland with nerve fibers containing the neuropeptide, PACAP.
Human follicles contain a variable quantity of gritty material, called corpora arenacea (or "acervuli", or "brain sand").
Chemical analysis shows that they are composed of calcium phosphate, calcium carbonate, magnesium phosphate, and ammonium phosphate.
Recently, calcite deposits have been described as well.FunctionThe pineal gland was originally believed to be a "vestigial remnant" of a larger organ (much as the appendix was thought to be a vestigial digestive organ).
It was only after the 1960s that scientists discovered that the pineal gland is responsible for the production of melatonin, which is regulated in a circadian rhythm.
Melatonin is a derivative of the amino acid tryptophan, which also has other functions in the Central Nervous System.
The production of melatonin by the pineal gland is stimulated by darkness and inhibited by light.
The retina detects the light, and directly signals and entrains the suprachiasmatic nucleus (SCN).
Fibers project from the SCN to the paraventricular nuclei (PVN), which relay the circadian signals to the spinal cord and out via the sympathetic system to superior cervical ganglia (SCG), and from there into the pineal gland.
The pineal gland is large in children, but shrinks at puberty.
It appears to play a major role in sexual development, hibernation in animals, metabolism, and seasonal breeding. The abundant melatonin levels in children is believed to inhibit sexual development, and pineal tumors have been linked with precocious puberty.
When puberty arrives, melatonin production is reduced.
Calcification of the pineal gland is typical in adults.
Pineal cytostructure seems to have evolutionary similarities to the retinal cells of chordates.
Modern birds and reptiles have been found to express the phototransducing pigment melanopsin in the pineal gland.
Avian pineal glands are believed to act like the suprachiasmatic nucleus in mammals.
Reports in rodents suggest that the pineal gland may influence the actions of drugs of abuse such as cocaine and antidepressants such as fluoxetine (Prozac); and contribute to regulation of neuronal vulnerability.
Mythologies, cultures and philosophiesThe secretory activity of the pineal gland has only relatively recently become understood.
To philosophers, its location deep in the brain seemed to indicate its importance.
This combination led to its being a "mystery" gland with myth, superstition and metaphysical theories surrounding its perceived function.
René Descartes, who dedicated much time to the study of the pineal gland, called it the "seat of the soul", believing it is unique in the anatomy of the human brain in being a structure not duplicated on the right and left sides.
This observation is not true, however; under a microscope one finds the pineal gland is divided into two fine hemispheres.
Another theory was that the pineal operated as a valve releasing fluids, thus the position taken during deep thought, with the head slightly down meeting the hand, was an allowance for the opening of these 'valves'.
The pineal gland is occasionally associated with the sixth chakra (also called Ajna or the third eye chakra in yoga) or sometimes the Seventh (Crown) chakra.
It is believed by some to be a dormant organ that can be awakened to enable telepathic communication.The relevance of the pineal gland to Discordianism, an idiosyncratic religion with roots in California psychedelic culture whose doctrines display great fondness for paradox, is great if not well understood.
Writers such as Alice Bailey, considered an early proponent of the new age movement, use the pineal-eye as a key element in their spiritual world-view...(see Alice Bailey: "A Treatise on White Magic")
The notion of a 'pineal-eye' is also crucial to the philosophy of the seminal French writer Georges Bataille, which is analysed at length by literary scholar Denis Hollier in 'Against Architecture' (1990, trans. Betsy Wing).
In this work Hollier discusses how Batailles' uses the concept of a 'pineal-eye' as a reference to a blind-spot in Western rationality.
ReferencesMacchi M, Bruce J. "Human pineal physiology and functional significance of melatonin.". Front Neuroendocrinol 25 (3-4): 177-95. PMID 15589268.
Bocchi G, Valdre G (1993). "Physical, chemical, and mineralogical characterization of carbonate-hydroxyapatite concretions of the human pineal gland.". J Inorg Biochem 49 (3): 209-20. PMID 8381851.
Baconnier S, Lang S, Polomska M, Hilczer B, Berkovic G, Meshulam G (2002). "Calcite microcrystals in the pineal gland of the human brain: first physical and chemical studies.". Bioelectromagnetics 23 (7): 488-95. PMID 12224052.
Klein D (2004). "The 2004 Aschoff/Pittendrigh lecture: Theory of the origin of the pineal gland--a tale of conflict and resolution.". J Biol Rhythms 19 (4): 264-79. PMID 15245646.
Moore RY, Heller A, Wurtman RJ, Axelrod J. Visual pathway mediating pineal response to environmental light. Science 1967;155(759):220–3. PMID 6015532
(Deutschlander et al.,1999)
Axelrod J (1970). "The pineal gland.". Endeavour 29 (108): 144-8. PMID 4195878.
Klein D (2004). "The 2004 Aschoff/Pittendrigh lecture: Theory of the origin of the pineal gland--a tale of conflict and resolution.". J Biol Rhythms 19 (4): 264-79. PMID 15245646.
Natesan A, Geetha L, Zatz M (2002). "Rhythm and soul in the avian pineal.". Cell Tissue Res 309 (1): 35-45. PMID 12111535.
Uz T, Akhisaroglu M, Ahmed R, Manev H (2003). "The pineal gland is critical for circadian Period1 expression in the striatum and for circadian cocaine sensitization in mice.". Neuropsychopharmacology 28 (12): 2117-23. PMID 12865893.
Uz T, Dimitrijevic N, Akhisaroglu M, Imbesi M, Kurtuncu M, Manev H (2004). "The pineal gland and anxiogenic-like action of fluoxetine in mice.". Neuroreport 15 (4): 691-4. PMID 15094477.
Manev H, Uz T, Kharlamov A, Joo J (1996). "Increased brain damage after stroke or excitotoxic seizures in melatonin-deficient rats.". FASEB J 10 (13): 1546-51. PMID 8940301.
Descartes and the Pineal Gland (Stanford Encyclopedia of Philosophy)
Descartes R. Treatise of Man. New York: Prometheus Books; 2003. ISBN 1-59102-090-5
Retrieved from "
http://en.wikipedia.org/wiki/Pineal_gland "