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{{Short description|Exocrine glands which secrete tears}}
{{Infobox anatomy
{{Infobox anatomy
| Name = Accessory lacrimal glands
| Name = Accessory lacrimal glands
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[[Krause's glands]], [[Wolfring's glands]] (or Ciaccio's glands) and Popov's gland are the '''accessory lacrimal glands''' of the [[lacrimal system]] of [[human eye]].<ref name="ESLDG"/> These glands are structurally and histologically similar to the [[Lacrimal gland|main lacrimal gland]]. Glands of Krause are located in the stroma of the conjunctival fornix, and the glands of Wolfring are located along the orbital border of the tarsal plate.<ref>{{cite book| title=Clinical Anatomy and Physiology of the Visual System |edition=3 |publisher=Elsevier |author=Lee Ann Remington |page=165}}</ref> These glands are oval and display numerous acini. The acini are surrounded, sometimes incompletely, by a row of myoepithelial cells. Animal studies suggest that the ducts of Wolfring glands have a tortuous course and open onto the palpebral conjunctiva. Like the main lacrimal gland, the accessory lacrimal glands are also densely innervated, but they lack parasympathetic innervation. These glands are exocrine glands, responsible for the basal (unstimulated) secretion of the middle aqueous layer of the tear film.<ref>{{cite web|title=The secretory system |url=https://vismed.trbchemedica.co.uk/business-professionals/understanding-the-tear-film/the-secretory-system |publisher=TRB Chemedica International }}</ref> 20 to 40 glands of Krause are found in the upper fornix, and 6-8 glands appear in the lower fornix.<ref>{{cite book|title=Clinical Anatomy and Physiology of the Visual System |edition=3 |publisher=Elsevier |author=Lee Ann Remington |pages=170–171}}</ref> There are usually 2 to 5 Ciaccio's glands, and are found along the superior tarsal border of the upper eye lid.<ref name="ESLDG">{{cite book |editor1-last=Presutti |editor1-first=Livio |editor2-last=Mattioli |editor2-first=Francesco |title=Endoscopic surgery of the lacrimal drainage system |publisher=Springer |isbn=978-3-319-20632-5 |pages=3–5 |chapter=Anatomy of the lacrimal drainage system|date=December 2015 }}</ref> Popov’s glands are located within the substance of the caruncle.<ref name="ESLDG"/>
[[Krause's glands]] and [[Wolfring's glands]] (or Ciaccio's glands) are the '''accessory lacrimal glands''' of the [[lacrimal system]] of [[human eye]].<ref name="ESLDG"/> These glands are structurally and histologically similar to the [[Lacrimal gland|main lacrimal gland]]. Glands of Krause are located in the stroma of the conjunctival fornix, and the glands of Wolfring are located along the orbital border of the tarsal plate.<ref>{{cite book| title=Clinical Anatomy and Physiology of the Visual System |edition=3 |publisher=Elsevier |author=Lee Ann Remington |page=165}}</ref> These glands are oval and display numerous acini. The acini are surrounded, sometimes incompletely, by a row of myoepithelial cells. Animal studies suggest that the ducts of Wolfring glands have a tortuous course and open onto the palpebral conjunctiva. Like the main lacrimal gland, the accessory lacrimal glands are also densely innervated, but they lack parasympathetic innervation. These glands are exocrine glands, responsible for the basal (unstimulated) secretion of the middle aqueous layer of the [[Tears|tear]] film.<ref>{{cite web|title=The secretory system |url=https://vismed.trbchemedica.co.uk/business-professionals/understanding-the-tear-film/the-secretory-system |publisher=TRB Chemedica International }}</ref> 20 to 40 glands of Krause are found in the upper fornix, and 6-8 glands appear in the lower fornix.<ref>{{cite book|title=Clinical Anatomy and Physiology of the Visual System |edition=3 |publisher=Elsevier |author=Lee Ann Remington |pages=170–171}}</ref> There are usually 2 to 5 Ciaccio's glands, and are found along the superior tarsal border of the upper eyelid.<ref name="ESLDG">{{cite book |editor1-last=Presutti |editor1-first=Livio |editor2-last=Mattioli |editor2-first=Francesco |title=Endoscopic surgery of the lacrimal drainage system |publisher=Springer |isbn=978-3-319-20632-5 |pages=3–5 |chapter=Anatomy of the lacrimal drainage system|date=December 2015 }}</ref> Popov’s glands are located within the substance of the caruncle.<ref name="ESLDG"/>


==Function==
==Function==
Previously it was thought that the Main lacrimal gland is responsible for reflex tear secretion and The accessory lacrimal glands of Wolfring and Krause are responsible for the basal secretion. But recent evidence suggests that all tearing may be reflex.<ref>{{cite web| title=Secretory Apparatus |url=https://www.aao.org/bcscsnippetdetail.aspx?id=767021d9-21a5-4b76-af43-49468a5bbd0c |publisher=American Academy of Ophthalmology }}</ref> The accessory glands account for approximately 10% of the total lacrimal secretory mass.<ref>{{cite journal| title=Review: The Lacrimal Gland and Its Role in Dry Eye
Previously it was thought that the main lacrimal gland is responsible for reflex tear secretion and the accessory lacrimal glands of Wolfring and Krause are responsible for the basal secretion. But recent evidence suggests that all tearing may be reflex.<ref>{{cite web| title=Secretory Apparatus |url=https://www.aao.org/bcscsnippetdetail.aspx?id=767021d9-21a5-4b76-af43-49468a5bbd0c |publisher=American Academy of Ophthalmology }}</ref> The accessory glands account for approximately 10% of the total lacrimal secretory mass.<ref>{{cite journal| title=Review: The Lacrimal Gland and Its Role in Dry Eye
|author=Christopher D. Conrady, Zachary P. Joos, and Bhupendra C. K. Patel |journal=Journal of Ophthalmology|year=2016|volume=2016|pages=1–11|doi=10.1155/2016/7542929|pmid=27042343|pmc=4793137|doi-access=free }}</ref>
|author=Christopher D. Conrady, Zachary P. Joos, and Bhupendra C. K. Patel |journal=Journal of Ophthalmology|year=2016|volume=2016|pages=1–11|doi=10.1155/2016/7542929|pmid=27042343|pmc=4793137|doi-access=free }}</ref>


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{{Accessory organs of the eye}}
{{Accessory organs of the eye}}


[[Category:Medicine]]
[[Category:Human eye anatomy]]
[[Category:Human eye]]

Latest revision as of 07:27, 31 July 2024

Accessory lacrimal glands
Accessory-lacrimal-glands
Details
SystemLacrimal system
Anatomical terminology

Krause's glands and Wolfring's glands (or Ciaccio's glands) are the accessory lacrimal glands of the lacrimal system of human eye.[1] These glands are structurally and histologically similar to the main lacrimal gland. Glands of Krause are located in the stroma of the conjunctival fornix, and the glands of Wolfring are located along the orbital border of the tarsal plate.[2] These glands are oval and display numerous acini. The acini are surrounded, sometimes incompletely, by a row of myoepithelial cells. Animal studies suggest that the ducts of Wolfring glands have a tortuous course and open onto the palpebral conjunctiva. Like the main lacrimal gland, the accessory lacrimal glands are also densely innervated, but they lack parasympathetic innervation. These glands are exocrine glands, responsible for the basal (unstimulated) secretion of the middle aqueous layer of the tear film.[3] 20 to 40 glands of Krause are found in the upper fornix, and 6-8 glands appear in the lower fornix.[4] There are usually 2 to 5 Ciaccio's glands, and are found along the superior tarsal border of the upper eyelid.[1] Popov’s glands are located within the substance of the caruncle.[1]

Function

[edit]

Previously it was thought that the main lacrimal gland is responsible for reflex tear secretion and the accessory lacrimal glands of Wolfring and Krause are responsible for the basal secretion. But recent evidence suggests that all tearing may be reflex.[5] The accessory glands account for approximately 10% of the total lacrimal secretory mass.[6]

History

[edit]

Ciaccio's glands are named after Italian anatomist Giuseppe Vincenzo Ciaccio (1824–1901), who described these glands in 1874. They are sometimes called "Wolfring's glands" after Polish ophthalmologist Emilj von Wolfring (1832-1906), who described them during the same time period as did Ciaccio. Krause's glands are named after German anatomist Karl Friedrich Theodor Krause (1797–1868).

See also

[edit]

References

[edit]
  1. ^ a b c Presutti, Livio; Mattioli, Francesco, eds. (December 2015). "Anatomy of the lacrimal drainage system". Endoscopic surgery of the lacrimal drainage system. Springer. pp. 3–5. ISBN 978-3-319-20632-5.
  2. ^ Lee Ann Remington. Clinical Anatomy and Physiology of the Visual System (3 ed.). Elsevier. p. 165.
  3. ^ "The secretory system". TRB Chemedica International.
  4. ^ Lee Ann Remington. Clinical Anatomy and Physiology of the Visual System (3 ed.). Elsevier. pp. 170–171.
  5. ^ "Secretory Apparatus". American Academy of Ophthalmology.
  6. ^ Christopher D. Conrady, Zachary P. Joos, and Bhupendra C. K. Patel (2016). "Review: The Lacrimal Gland and Its Role in Dry Eye". Journal of Ophthalmology. 2016: 1–11. doi:10.1155/2016/7542929. PMC 4793137. PMID 27042343.{{cite journal}}: CS1 maint: multiple names: authors list (link)
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