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paragraph 3: changed from "does not come in pairs" to "is not paired".
Not true. Other unpaired brain structures include raphe nuclei, cerebral aqueduct, third ventricle, etc.
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The pineal gland consists mainly of pinealocytes, but four other [[cell (biology)|cell]] types have been identified.
The pineal gland consists mainly of pinealocytes, but four other [[cell (biology)|cell]] types have been identified.

The pineal gland is the only brain structure that is not paired.


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Revision as of 03:15, 17 May 2007

Pineal gland
Endocrine system
Diagram of pituitary and pineal glands.
Details
Arterysuperior cerebellar artery
Identifiers
Latinglandula pinealis
MeSHD010870
NeuroNames297
NeuroLex IDbirnlex_1184
TA98A11.2.00.001
TA23862
FMA62033
Anatomical terminology

The pineal gland (also called the pineal body or epiphysis) is a small endocrine gland in the brain.It is shaped like a tiny pine cone,and is located near the center of the brain, between the two hemispheres, tucked in a groove where the two rounded thalamic bodies join. It produces a hormone that may weakly modulate wake/sleep patterns. A recent review of the pineal and its secreted hormone, melatonin, is available. [1]

Location

The 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 composition

The 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.

Cell type Description
pinealocytes 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 Interstitial cells are located between the pinealocytes.
perivascular phagocyte Many capillaries are present in the gland, and perivascular phagocytes are located close to these blood vessels. The perivascular phagocytes are antigen presenting cells.
pineal neurons In higher vertebrates neurons are located in the pineal gland. However, these are not present in rodents.
peptidergic neuron-like cells 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. [2]. Recently, calcite deposits have been described as well [3].

In lower vertebrates

Pinealocytes in lower vertebrate animals have a strong resemblance to the photoreceptor cells of the eye. Some evolutionary biologists believe that the vertebrate pineal cells share a common evolutionary ancestor with retinal cells[4].

In some vertebrates, exposure to light can set off a chain reaction of enzymes, hormones, and neuroreceptors, which may help regulate the animal's circadian rhythm[5].

In humans and other mammals, this function is served by the retinohypothalamic system that sets the rhythm within the suprachiasmatic nucleus. Cultural and social interactions produce exposures to artificial light that influence the setting of the suprachiasmatic clock. Evidence for a role for opsin-related light-sensing compounds in the skin of mammals is presently controversial. Research suggests that the pineal gland may serve a magnetoreceptive function in some animals. [6]

Some early vertebrate fossil skulls have a pineal foramen. This corroborates with the physiology of the modern lamprey, tuatara, and some other vertebrates.

Function

The 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). Aaron Lerner and colleagues at Yale University discovered that melatonin, the most potent compound then known to lighten frog skin, was present in the highest concentrations in the pineal [7]. 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. [8] 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 function(s) of melatonin in humans is not clear.

In his book DMT: The Spirit Molecule, Dr. Rick Strassman theorized that the pineal gland may produce the psychedelic chemical DMT[1], but this has not been proven[2].

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. [9] 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. [10]

Reports in rodents suggest that the pineal gland may influence the actions of drugs of abuse such as cocaine [11] and antidepressants such as fluoxetine (Prozac)[12]; and contribute to regulation of neuronal vulnerability.[13]

Mythologies, cultures and philosophies

The secretory activity of the pineal gland has only relatively recently become understood. Historically, its location deep in the brain suggested to philosophers that it possessed particular 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,[14] called it the "seat of the soul" [15], 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.

Additional images

  • Mesal aspect of a brain sectioned in the median sagittal plane.
    Mesal aspect of a brain sectioned in the median sagittal plane.
  • Dissection showing the ventricles of the brain.
    Dissection showing the ventricles of the brain.
  • Hind- and mid-brains; postero-lateral view.
    Hind- and mid-brains; postero-lateral view.
  • Median sagittal section of brain.
    Median sagittal section of brain.

References

  1. ^ Macchi M, Bruce J. "Human pineal physiology and functional significance of melatonin". Front Neuroendocrinol. 25 (3–4): 177–95. PMID 15589268.
  2. ^ 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.
  3. ^ 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.{{cite journal}}: CS1 maint: multiple names: authors list (link)
  4. ^ 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.
  5. ^ Moore RY, Heller A, Wurtman RJ, Axelrod J. Visual pathway mediating pineal response to environmental light. Science 1967;155(759):220–3. PMID 6015532
  6. ^ (Deutschlander et al.,1999)
  7. ^ Lerner AB, Case JD, Takahashi Y (1960). "Isolation of melatonin and 5-methoxyindole-3-acetic acid from bovine pineal glands". J Biol Chem. 235: 1992–7. PMID 14415935.{{cite journal}}: CS1 maint: multiple names: authors list (link)
  8. ^ Axelrod J (1970). "The pineal gland". Endeavour. 29 (108): 144–8. PMID 4195878.
  9. ^ 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.
  10. ^ Natesan A, Geetha L, Zatz M (2002). "Rhythm and soul in the avian pineal". Cell Tissue Res. 309 (1): 35–45. PMID 12111535.{{cite journal}}: CS1 maint: multiple names: authors list (link)
  11. ^ 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.{{cite journal}}: CS1 maint: multiple names: authors list (link)
  12. ^ 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.{{cite journal}}: CS1 maint: multiple names: authors list (link)
  13. ^ 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.{{cite journal}}: CS1 maint: multiple names: authors list (link)
  14. ^ Descartes and the Pineal Gland (Stanford Encyclopedia of Philosophy)
  15. ^ Descartes R. Treatise of Man. New York: Prometheus Books; 2003. ISBN 1-59102-090-5
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