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not unite with one another. One exception to this rule is the liver; this occurs 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.
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As growth proceeds, the column of cells may split 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
345:
Here is a diagram that shows the differences between endocrine and exocrine glands. The major difference is that exocrine glands secrete substances out of the body and endocrine glands secrete substances into capillaries and blood
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in an animal's body that produces and secretes different substances either into the bloodstream or into a body cavity or outer surface that the organism needs. A gland may also function to remove unwanted substances such as
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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.
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may not be true apocrine glands as they may not use the apocrine method of secretion. (e.g. mammary gland, sweat gland of arm pit, pubic region, skin around anus, lips and nipples)
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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.
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into the bloodstream. Basal lamina typically can be seen as a layer around the glands to which more than a million tiny blood vessels are attached. These glands often secrete
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This image shows some of the various possible glandular arrangements. These are the compound tubular, compound acinar, and compound tubulo-acinar glands.
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secrete substances that circulate through the bloodstream. The glands secrete their products through
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One or more of the preceding sentences incorporates text from a publication now in the
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This article is about the gland in animals. For information specific to plants, see
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glands secrete a watery, often protein-rich, fluid-like product, e.g. sweat glands.
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In the second main variety of gland the secretory portion is enlarged and the
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698:. Vol. 9 (11th ed.). Cambridge University Press. pp. 705–707.
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secrete their products through a duct into a body cavity or outer surface.
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of a gland. The diseased gland has abnormal formation or development of
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glands – the entire cell disintegrates to secrete its substances. (e.g.
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There are two types of gland each with a different method of secretion.
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surface. The glands in this group can be divided into three groups:
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onto an outer or inner surface of the body, such as the skin or the
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If the gland retains its shape as a tube throughout it is termed a
713:(32nd ed.). Philadelphia, PA: Saunders/Elsevier. p. 30.
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Exocrine glands can further be categorized by their product:
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Glands are divided based on their function into two groups:
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product. These glands are also known as oil glands, e.g.
646:(3rd ed.). New York: McGraw-Hill. pp. 73–75.
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Histopathology of sclerosing adenosis of the breast.
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74:. Unsourced material may be challenged and removed.
310:Glands are classified according to their shape.
436:. (e.g. mucous and serous glands; also called "
325:variously increased in size. These are termed
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690:Epithelial, Endothelial and Glandular Tissues
299:Every gland is formed by an ingrowth from an
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372:which play an important role in maintaining
450:'s body is lost during secretion. The term
432:glands – cells secrete their substances by
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497:glands secrete a viscous product, rich in
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249:are ductless and secrete their products,
134:Learn how and when to remove this message
711:Dorland's illustrated medical dictionary
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458:, however it is thought that apocrine
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168:, at the left a group of serous acini.
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7:
895:Pseudostratified columnar epithelium
446:glands – a portion of the secreting
164:. At the right is a group of mucous
72:adding citations to reliable sources
25:
421:. Secretion is directly onto the
413:secrete their products through a
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543:
274:List of glands of the human body
48:
59:needs additional citations for
875:Stratified columnar epithelium
868:Stratified cuboidal epithelium
861:Stratified squamous epithelium
501:(such as glycoproteins), e.g.
454:is often used to refer to the
260:Glands are mostly composed of
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642:Saladin, Kenneth S. (2011).
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841:Simple columnar epithelium
834:Simple cuboidal epithelium
815:Simple squamous epithelium
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396:are all endocrine glands.
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709:Alberts, Daniel (2012).
909:Transitional epithelium
695:Encyclopædia Britannica
900:Respiratory epithelium
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419:gastrointestinal tract
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209:Anatomical terminology
39:Gland (disambiguation)
608:"Definition of Gland"
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528:Clinical significance
456:apocrine sweat glands
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294:
286:
68:improve this article
37:For other uses, see
27:Type of animal organ
618:on 14 December 2017
586:which is sometimes
329:or saccular glands.
162:submandibular gland
1041:Myoepithelial cell
555:. You can help by
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202:H2.00.02.0.02002
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614:. Archived from
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521:meibomian glands
470:sebaceous glands
362:Endocrine glands
351:Endocrine glands
247:Endocrine glands
215:edit on Wikidata
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411:Exocrine glands
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400:Exocrine glands
386:pituitary gland
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334:Types of glands
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242:from the body.
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452:Apocrine gland
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406:Exocrine gland
404:Main article:
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394:adrenal glands
392:, and the two
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1021:Mucous glands
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57:This article
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1058:Intralobular
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620:. Retrieved
616:the original
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575:
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561:
557:adding to it
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503:goblet cells
483:
460:sweat glands
451:
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382:thymus gland
378:pineal gland
366:basal lamina
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66:Please help
61:verification
58:
825:Mesothelium
820:Endothelium
478:zeis glands
374:homeostasis
279:Development
179:Identifiers
1034:Components
914:Urothelium
854:stratified
767:Epithelial
594:References
564:April 2014
434:exocytosis
301:epithelial
272:See also:
124:April 2024
94:newspapers
1063:Striated
1009:Secretion
977:Meibomian
972:Sebaceous
967:Holocrine
950:Merocrine
943:Mechanism
787:Cuboidal
782:Squamous
509:Sebaceous
474:meibomian
466:Holocrine
430:Merocrine
268:Structure
18:Glandular
1098:Category
962:Apocrine
792:Columnar
588:tumorous
576:Adenosis
444:Apocrine
370:hormones
346:vessels.
327:alveolar
251:hormones
190:glandula
955:Eccrine
683::
580:disease
578:is any
438:eccrine
174:Details
108:scholar
83:"Gland"
1104:Glands
1075:Acinus
929:Glands
808:Simple
769:tissue
717:
677:
650:
495:Mucous
489:Serous
423:apical
376:. The
323:lumens
233:or an
160:Human
110:
103:
96:
89:
81:
1053:Ducts
988:Shape
936:Types
888:Other
801:Types
775:Cells
622:2 May
513:lipid
240:urine
235:organ
229:is a
227:gland
213:[
185:Latin
166:acini
149:Gland
115:JSTOR
101:books
1079:Lobe
715:ISBN
648:ISBN
624:2018
519:and
476:and
448:cell
415:duct
231:cell
87:news
692:".
559:.
70:by
1100::
662:^
632:^
610:.
590:.
472::
388:,
384:,
380:,
225:A
197:TH
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112:·
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