Play Video
1
GLand Jungle Surf Camp
GLand Jungle Surf Camp
::2006/04/28::
Play Video
2
Exocrine Gland and Endocrine Glands
Exocrine Gland and Endocrine Glands
::2010/05/04::
Play Video
3
How to Decalcify Your Pineal Gland
How to Decalcify Your Pineal Gland
::2012/08/07::
Play Video
4
Anal Glands (2): How to express them?
Anal Glands (2): How to express them?
::2009/01/08::
Play Video
5
[SHOCKING NEWS] The Pineal Gland - The Greatest Cover Up In History
[SHOCKING NEWS] The Pineal Gland - The Greatest Cover Up In History
::2014/01/03::
Play Video
6
Endocrine gland hormone review
Endocrine gland hormone review
::2013/09/19::
Play Video
7
Decalcify Your Pineal Gland! A guided meditation to unblock your Ajna Chakra, Third Eye. Sudevi
Decalcify Your Pineal Gland! A guided meditation to unblock your Ajna Chakra, Third Eye. Sudevi
::2012/04/02::
Play Video
8
Ab-Soul - Pineal Gland (Official Video)
Ab-Soul - Pineal Gland (Official Video)
::2012/04/17::
Play Video
9
DMT & The Mysteries of The Pineal Gland
DMT & The Mysteries of The Pineal Gland
::2014/01/30::
Play Video
10
288Hz MMM Mantra - Most Powerful 3rd Eye Pineal Gland Activation in the World
288Hz MMM Mantra - Most Powerful 3rd Eye Pineal Gland Activation in the World
::2013/11/13::
Play Video
11
1 hour Pineal Gland Activation with 936Hz Solfeggio Meditation Music
1 hour Pineal Gland Activation with 936Hz Solfeggio Meditation Music
::2013/06/27::
Play Video
12
The hypothalamus and pituitary gland
The hypothalamus and pituitary gland
::2013/09/19::
Play Video
13
How to Decalcify Your Pineal Gland, The Science of The Pineal Gland and Third Eye Activation
How to Decalcify Your Pineal Gland, The Science of The Pineal Gland and Third Eye Activation
::2013/07/29::
Play Video
14
Ab-Soul - Pineal Gland
Ab-Soul - Pineal Gland
::2013/08/16::
Play Video
15
936Hz Pineal Gland Activation Meditation
936Hz Pineal Gland Activation Meditation
::2010/09/02::
Play Video
16
Pineal Gland Activation Video 2013 Brainwave Binaural Beat Full Length HD Meditation
Pineal Gland Activation Video 2013 Brainwave Binaural Beat Full Length HD Meditation
::2013/02/05::
Play Video
17
How to Detox the Pineal Gland and Unlock Superhuman Potential - Saturday Strategy
How to Detox the Pineal Gland and Unlock Superhuman Potential - Saturday Strategy
::2013/07/26::
Play Video
18
AMAZING MEDITATION: Brain Sound Dopamin Booster Pineal-Gland
AMAZING MEDITATION: Brain Sound Dopamin Booster Pineal-Gland
::2013/04/14::
Play Video
19
Thyroid gland - What
Thyroid gland - What's the function of the thyroid?
::2013/06/18::
Play Video
20
The Pineal Gland: Mysticism and Neuroscience
The Pineal Gland: Mysticism and Neuroscience
::2014/02/22::
Play Video
21
Activate Your Pineal Gland With Chaga Mushroom
Activate Your Pineal Gland With Chaga Mushroom
::2013/05/08::
Play Video
22
Misteryo: The Pineal Gland
Misteryo: The Pineal Gland
::2011/07/28::
Play Video
23
Understanding Sacred Geometry & The Pineal Gland Consciousness
Understanding Sacred Geometry & The Pineal Gland Consciousness
::2014/01/22::
Play Video
24
Stop Mind control + Pineal Gland Cleanes , Healing , Repair , Activation +-(new) HD [documentary]
Stop Mind control + Pineal Gland Cleanes , Healing , Repair , Activation +-(new) HD [documentary]
::2014/03/06::
Play Video
25
CLEANSING PITUITARY & PINEAL GLAND ★ Meditation Brainpower Activation
CLEANSING PITUITARY & PINEAL GLAND ★ Meditation Brainpower Activation
::2013/12/23::
Play Video
26
PINEAL GLAND ➜ How to Decalcify & Activate Successfully!
PINEAL GLAND ➜ How to Decalcify & Activate Successfully!
::2012/12/25::
Play Video
27
Ab-Soul - Pineal Gland
Ab-Soul - Pineal Gland
::2012/05/10::
Play Video
28
5 Health Tips to Decalcify the Pineal Gland
5 Health Tips to Decalcify the Pineal Gland
::2014/04/10::
Play Video
29
CLEANSING PINEAL GLAND ★ Meditation ★ Unlock Your Brains Power
CLEANSING PINEAL GLAND ★ Meditation ★ Unlock Your Brains Power
::2013/12/20::
Play Video
30
Pituitary Gland Stimulation Binaural Beats
Pituitary Gland Stimulation Binaural Beats
::2013/02/18::
Play Video
31
Hypothalamus and Pituitary Gland
Hypothalamus and Pituitary Gland
::2013/02/25::
Play Video
32
Adrenal Gland Explained Clearly! 1 of 2
Adrenal Gland Explained Clearly! 1 of 2
::2012/05/23::
Play Video
33
The Truth About Your Pineal Gland
The Truth About Your Pineal Gland
::2012/01/08::
Play Video
34
EZ Pineal Gland Activation Instruction PLEASE SHARE
EZ Pineal Gland Activation Instruction PLEASE SHARE
::2013/01/16::
Play Video
35
Parathyroid Glands and Hyperparathyroidism: Amazing Animation.
Parathyroid Glands and Hyperparathyroidism: Amazing Animation.
::2012/10/20::
Play Video
36
Thyroid Gland - Thyroid Hormones
Thyroid Gland - Thyroid Hormones
::2012/10/08::
Play Video
37
Foods That Decalcify Pineal Gland
Foods That Decalcify Pineal Gland
::2013/02/26::
Play Video
38
What is the Parotid Gland?
What is the Parotid Gland?
::2013/11/28::
Play Video
39
What is the Pituitary Gland?
What is the Pituitary Gland?
::2012/04/13::
Play Video
40
Isochronic tone stimulation: Pineal Gland (30min)
Isochronic tone stimulation: Pineal Gland (30min)
::2011/09/14::
Play Video
41
How to Express Your Dog
How to Express Your Dog's Anal Glands
::2012/07/17::
Play Video
42
Pituitary Gland High Stimulation
Pituitary Gland High Stimulation
::2013/06/07::
Play Video
43
Ancient Egypt, GOD and the Pineal gland.
Ancient Egypt, GOD and the Pineal gland.
::2012/10/31::
Play Video
44
Pineal Gland Awakening,DMT, DNA Upgrade, Activating the Astral Body. Evolution, Enlightenment.
Pineal Gland Awakening,DMT, DNA Upgrade, Activating the Astral Body. Evolution, Enlightenment.
::2013/04/15::
Play Video
45
Meibomian Gland Dysfunction and Evaporative Dry Eye
Meibomian Gland Dysfunction and Evaporative Dry Eye
::2013/01/12::
Play Video
46
Pineal Gland, DMT, Vatican Secrets ( Pine Cone Symbolism )
Pineal Gland, DMT, Vatican Secrets ( Pine Cone Symbolism )
::2012/06/19::
Play Video
47
The Pituitary Gland: Anatomy, Circulation, Hormones, and More!
The Pituitary Gland: Anatomy, Circulation, Hormones, and More!
::2013/01/19::
Play Video
48
The Pineal Gland Is The Seat Of The Soul - By Danny Wilten
The Pineal Gland Is The Seat Of The Soul - By Danny Wilten
::2012/12/29::
Play Video
49
Anal Gland Abscess Dog
Anal Gland Abscess Dog
::2013/03/08::
Play Video
50
parotitis and salivary gland infections
parotitis and salivary gland infections
::2011/08/12::
NEXT >>
RESULTS [51 .. 101]
From Wikipedia, the free encyclopedia
Jump to: navigation, search
Gland
Gray1026.png
Human submaxillary gland. At the right is a group of mucous alveoli, at the left a group of serous alveoli.
Latin glandula
Code TH H2.00.02.0.02002

A gland is an organ in an animal's body that synthesizes a substance such as hormones for release into the bloodstream (endocrine gland) or into cavities inside the body or its outer surface (exocrine gland).

Structure[edit]

Glands are organs in that synthesizes a substance such as hormones for release into the bloodstream (endocrine gland) or into cavities inside the body or its outer surface (exocrine gland). Numerous glands exist throughout the human body.

Development[edit]

This image shows some of the various possible glandular arrangements. These are the simple tubular, simple branched tubular, simple coiled tubular, simple acinar, and simple branched acinar glands.
This image shows some of the various possible glandular arrangements. These are the compound tubular, compound acinar, and compound tubulo-acinar glands.

Every gland is formed by an ingrowth from an epithelial surface. This ingrowth may in the beginning possess a tubular structure, but in other instances glands may start as a solid column of cells which subsequently becomes tubulated.

As growth proceeds, the column of cells may divide or give off offshoots, in which case a compound gland is formed. In many glands the number of branches is limited, in others (salivary, pancreas) a very large structure is finally formed by repeated growth and sub-division. As a rule, the branches do not unite with one another, but in one instance, the liver, this does occur when a reticulated compound gland is produced. In compound glands the more typical or secretory epithelium is found forming the terminal portion of each branch, and the uniting portions form ducts and are lined with a less modified type of epithelial cell.

Glands are classified according to their shape.

  • If the gland retains its shape as a tube throughout it is termed a tubular gland.
  • In the second main variety of gland the secretory portion is enlarged and the lumen variously increased in size. These are termed alveolar or saccular glands.

Function[edit]

Glands are divided based on their function into two groups:

Endocrine glands[edit]

Endocrine glands secrete substances that circulate through the blood stream. These glands that secrete their products through the basal lamina into the blood stream and lack a duct system. These glands often secrete hormones, and play an important role in maintaining homeostasis. The pineal gland, thymus gland, pituitary gland, thyroid gland, and the two adrenal glands are all endocrine glands.

Exocrine glands[edit]

Exocrine glands secrete their products through a duct onto an outer surface of the body, such as the skin or the human gastrointestinal tract. Secretion is directly onto the apical surface. The glands in this group can be divided into three groups:

    • Apocrine glands a portion of the secreting cell's body is lost during secretion. Apocrine gland is often used to refer to the apocrine sweat glands, however it is thought that apocrine sweat glands may not be true apocrine glands as they may not use the apocrine method of secretion.
    • Holocrine glands the entire cell disintegrates to secrete its substances (e.g., sebaceous glands)
    • Merocrine glands cells secrete their substances by exocytosis (e.g., mucous and serous glands). Also called "eccrine".

The type of secretory product of exocrine glands may also be one of three categories:

  • Serous glands secrete a watery, often protein-rich product.
  • Mucous glands secrete a viscous product, rich in carbohydrates (e.g., glycoproteins).
  • Sebaceous glands secrete a lipid product.These glands are also known as oil glands.

Clinical significance[edit]

Other animals[edit]

Additional images[edit]

References[edit]

Public Domain This article incorporates text from a publication now in the public domainChisholm, Hugh, ed. (1911). Encyclopædia Britannica (11th ed.). Cambridge University Press. 

External links[edit]

Wikipedia content is licensed under the GFDL License

Mashpedia enables any individual or company to promote their own Youtube-hosted videos or Youtube Channels, offering a simple and effective plan to get them in front of our engaged audience.

Want to learn more? Please contact us at: hello@mashpedia.com

Powered by YouTube
LEGAL
  • Mashpedia © 2014