Accessory visual structures

Accessory visual structures
Front of left eye with eyelids separated.
Details
Identifiers
Latinstructurae oculi accessoriae or
adnexa oculi
TA98A15.2.07.001
TA26815
FMA76554
Anatomical terminology

The accessory visual structures (or adnexa of eye, ocular adnexa, etc.) are the protecting and supporting structures (adnexa) of the eye, including the eyebrow, eyelids, and lacrimal apparatus. The eyebrows, eyelids, eyelashes, lacrimal gland and drainage apparatus all play a crucial role with regards to globe protection, lubrication, and minimizing the risk of ocular infection.[1] The adnexal structures also help to keep the cornea moist and clean.

One source defines "ocular adnexa" as the orbit, conjunctiva, and eyelids.[2] The orbit and extraocular muscles allow for the smooth movement of the eyeball.

Eyebrow

Main article: Eyebrow

The eyebrow is an area of thick, short hairs above the eye. The main function is to prevent sweat, water, and other debris falling into the eye, but they are also important to human communication and facial expressions.

Eyelid

Main article: Eyelid

An eyelid is a thin fold of skin that covers and protects the eye. The levator palpebrae superioris muscle  helps in the movement of eyelid. The human eyelid features a row of eyelashes along the eyelid margin, which helps in protection of the eye from dust and foreign debris. The main function of eyelid is to keep the cornea moist and clean.

Eyelid and prominent eyelashes of a human adult

Eyelash

Main article: Eyelash

The eyelashes are the numerous hairs that grow along the eyelid margin and are highly sensitive to touch. They function to heighten protection of the eye by catching dust and debris via blinking, and to regulate evaporation of the tear film of the cornea. Eyelashes are also important in human society and beauty standards, as prominent lashes draw attention to the eyes and thus are a universally desirable facial feature.

Conjunctiva

Main article: Conjunctiva

The conjunctiva is a tissue that lines the inside of the eyelids and covers the sclera. It is composed of unkeratinized, stratified squamous epithelium with goblet cells, and stratified columnar epithelium. The conjunctiva is basically transparent, and the white colour we see is actually sclera.

Lacrimal apparatus

Main article: Lacrimal apparatus

The lacrimal apparatus is the physiological system containing the orbital structures for tear production and drainage.[3]
It consists of:

The orbit

Main article: Orbit (anatomy)

The orbit is the cavity or socket of the skull in which the eye and its appendages are situated. In the adult human, the volume of the orbit is 30 millilitres (1.06 imp fl oz; 1.01 US fl oz), of which the eye occupies 6.5 ml (0.23 imp fl oz; 0.22 US fl oz).[4] The orbit helps in smooth rotation of the eyeball.

References

  1. ^ "Ophthalmology training".
  2. ^ Knowles, Daniel M. (2001). Neoplastic hematopathology. Hagerstwon, MD: Lippincott Williams & Wilkins. p. 1303. ISBN 0-683-30246-9.
  3. ^ Cassin, B. and Solomon, S. Dictionary of Eye Terminology. Gainesville, Florida: Triad Publishing Company, 1990.
  4. ^ Tasman, W.; Jaeger, E. A., eds. (2007). "Embryology and Anatomy of the Orbit and Lacrimal System". Duane's Ophthalmology. Lippincott Williams & Wilkins. ISBN 978-0-7817-6855-9.

Read other articles:

István V dari Hungaria

István VAdipati Slavonia, Adipati TransilvaniaSegel kerajaan IstvánRaja Hungaria dan KroasiaBerkuasa1270–1272Hungariaseb. 124617 Mei 1270PendahuluBéla IVPenerusLászló IVAdipati StiriaBerkuasa1258–1260PendahuluBéla IVPenerusOttokar VInformasi pribadiKelahiranseb. 18 Oktober 1239Kematian6 Agustus 1272 – 1239; umur -34–-33 tahunPulau CsepelPemakamanBiara di Pulau Kelinci (sekarang Pulau Margit di Budapest)DynastyWangsa ÁrpádAyahBéla IV dari HungariaIbuMaria Laskarin...

 

Oran Milo Roberts

Governor of Texas from 1879 to 1883 This article needs additional citations for verification. Please help improve this article by adding citations to reliable sources. Unsourced material may be challenged and removed.Find sources: Oran Milo Roberts – news · newspapers · books · scholar · JSTOR (June 2022) (Learn how and when to remove this template message) Oran Milo Roberts17th Governor of TexasIn officeJanuary 21, 1879 – January 16, 18...

 

Daftar Panglima Komando Daerah Militer Jayakarta

Panglima Kodam JayakartaLambang Kodam JayaPetahanaMayjen TNI Mohamad Hasansejak 24 Maret 2023TNI Angkatan DaratKantorMarkas Kodam Jaya, Jakarta Timur, DKI JakartaDibentuk24 Desember 1949Pejabat pertamaLetkol Inf. Daan JahjaSitus webkodamjaya-tniad.mil.id Panglima Komando Daerah Militer Jayakarta atau biasa disingkat Pangdam Jaya/Pangdam Jayakarta adalah jabatan yang diemban oleh seorang perwira tinggi TNI-AD dengan pangkat Mayor Jenderal (Mayjen). Daftar pejabat Berikut adalah nama nama ...

Acquittal

The legal result of a verdict of not guilty For other uses, see Not guilty. Acquitted redirects here. For other uses, see Acquitted (disambiguation). The acquittal of the defendants in the Eureka Rebellion is celebrated by community members. Criminal procedure Criminal trials and convictions Rights of the accused Fair trial Pre-trial Speedy trial Jury trial Counsel Presumption of innocence Exclusionary rule1 Self-incrimination Double jeopardy2 Bail Appeal Verdict Conviction Acquittal Not prov...

 

Formula Le Mans

Questa voce sull'argomento automobilismo è solo un abbozzo. Contribuisci a migliorarla secondo le convenzioni di Wikipedia. Segui i suggerimenti del progetto di riferimento. Una Oreca FLM09 categoria Formula Le Mans La Formula Le Mans è una classe di vetture da competizione creata dall'Automobile Club de l'Ouest (organizzatore della celebre 24 Ore di Le Mans) nel 2009 per poter partecipare alle gare (organizzate da diversi promotori) in accordo alle norme tecnico-sportive da esso stes...

 

Serangan Jakarta 2016

Serangan Jakarta 2016Pos Polisi yang rusak akibat serangan bom bunuh diri di depan Gedung Sarinah, Jalan MH Thamrin. Lokasi serangan teroris Sarinah-Starbucks di Jakarta Pusat, 14 Januari 2016.Peta lokasi serangan di JakartaLokasiPerempatan Plaza Sarinah, Jalan MH Thamrin, JakartaKoordinat6°11′12.56″S 106°49′23.38″E / 6.1868222°S 106.8231611°E / -6.1868222; 106.8231611Koordinat: 6°11′12.56″S 106°49′23.38″E / 6.1868222°S 106.823161...

Unintended pregnancy

Pregnancy that is mistimed, unplanned or unwanted at the time of conception Unintended pregnancies are pregnancies that are mistimed or unwanted at the time of conception[1], also known as unplanned pregnancies.[2][3] Sexual activity without the use of effective contraception through choice or coercion is the predominant cause of unintended pregnancy. Worldwide, the unintended pregnancy rate is approximately 45% of all pregnancies (for a total of 120 million unintended...

 

Kids in Glass Houses

Kids In Glass Houses Paese d'origine Regno Unito GenerePower popRock alternativo Periodo di attività musicale2003 – in attività EtichettaRoadrunner Records Album pubblicati3 Studio3 Sito ufficiale Modifica dati su Wikidata · Manuale I Kids in Glass Houses sono stati una band power pop/rock proveniente dalle valli circondanti Cardiff, la capitale del Galles, nel Regno Unito. Vantano influenze che vanno dal classic pop di The Police, Michael Jackson, Prince e T...

 

1973 Nobel Prize in Literature

Award 1973 Nobel Prize in LiteraturePatrick Whitefor an epic and psychological narrative art which has introduced a new continent into literature.Date 18 October 1973 (1973-10-18) (announcement) 10 December 1973 (ceremony) LocationStockholm, SwedenPresented bySwedish AcademyFirst awarded1901WebsiteOfficial website ← 1972 · Nobel Prize in Literature · 1974 → The 1973 Nobel Prize in Literature was awarded to the Australian writer Patrick White (1...

(190166) 2005 UP156

(190166) 2005 UP156   المكتشف سبايس واتش  موقع الاكتشاف مرصد قمة كت الوطني  تاريخ الاكتشاف 31 أكتوبر 2005  الأسماء البديلة 2005 UP156  فئةالكوكب الصغير كويكبات آمور  الأوج 3.109348436539789 وحدة فلكية  الحضيض 1.12268337805185 وحدة فلكية  نصف المحور الرئيسي 2.116015907295819 وحدة فلكية  الشذ...

 

منتوحوتب الأول

منتوحوتب الأول Mentuhotep Iتمثال منتوحتب الأول من الفنتين، في القاهرة.فرعون مصرالحقبة2135 ق.م, الأسرة الحادية عشرسبقهمري كا رعتبعهإنتف الأول الألقاب الملكية الاسم الشخصي: ( )اسم حورس:  الأبالملك إنتف الأكبر - (أنتف بن إكو) منتوحوتب الأول، (بالإنجليزية: Mentuhotep I)‏. هو ملك فرعونى �...

 

Kim Jong-pil

South Korean politician (1926–2018) For other people named Kim Jong-pil, see Kim Jong-pil (disambiguation). Not to be confused with Kim Jong-il. This article contains translated text and needs attention from someone fluent in Korean and English. Please see this article's entry on Pages needing translation into English for discussion. If you have just labeled this article as needing attention, please add{{subst:Needtrans|pg=Kim Jong-pil |language=Korean |co...

More Fast Songs About the Apocalypse

2017 studio album by Moby & The Void Pacific ChoirMore Fast Songs About the ApocalypseStudio album by Moby & The Void Pacific ChoirReleasedJune 12, 2017 (2017-06-12)Recorded2014–16Length35:46Label Little Idiot Mute Producer Moby Moby chronology These Systems Are Failing(2016) More Fast Songs About the Apocalypse(2017) Everything Was Beautiful, and Nothing Hurt(2018) More Fast Songs About the Apocalypse is the fourteenth studio album by American electronica mus...

 

Crown Court

Court of first instance of England and Wales This article is about the court in England and Wales. For the Crown Court in Northern Ireland, see Courts of Northern Ireland. For the TV programme, see Crown Court (TV series). For the church, see Crown Court Church. Crown CourtCentral Criminal Court in LondonEstablished1 January 1972JurisdictionEngland and WalesAuthorized byCourts Act 1971Appeals toCourt of Appeal(indictable offences)High Court(case stated)Appeals fromMagistrates' courtsWebsiteww...

 

Sirius

Sirius Posisi dari bintang Sirius (dilingkari) Observation data Epoch J2000.0      Ekuinoks ICRS Konstelasi Canis Major Pengucapan /ˈsɪriəs/[1] Sirius Asensio rekta  06j 45m 08.91728d[2] Deklinasi  −16° 42′ 58.0171″[2] Magnitudo semu (V) −1.46[3] A Asensio rekta  06j 45m 08.917d[4] Deklinasi  −16° 42′ 58.02″[4] Magnitudo semu (V) −1.47...

آل سعود

  آل سعود آل سعودشعار النبالة الدولة  الدولة السعودية الأولى (1744–1818)  الدولة السعودية الثانية (1824–1891)  السعودية (1902–الآن) الأسرة الأصل بنو حنيفة بن بكر بن وائل الألقاب ملك المملكة العربية السعودية خادم الحرمين الشريفين (حالياً) صاحب الجلالة المعظم (سابقاَ) عظمة ا...

 

Topizität

In der Stereochemie bezeichnet die Topizität (von Topografie, griechisch τόπος tópos, deutsch ‚Orts-, Lagebeschreibung‘) die Lagebeziehung identischer funktioneller Gruppen oder Atome (sprich Substituenten) innerhalb eines Moleküls relativ zueinander.[1] Abhängig von der Beziehung können solche Gruppen homotop, enantiotop, oder diastereotop sein. Man spricht von Homotopizität, Enantiotopizität, oder Diastereotopizität.[2] Inhaltsverzeichnis 1 Homotopiz...

 

Jesse Root Grant

Father of US President Grant (1794–1873) For his grandson, the youngest son of Ulysses S. Grant, see Jesse Root Grant (politician). Jesse Root GrantGrant in 1870Mayor of Bethel, OhioIn office1851–1855Preceded byOffice createdSucceeded byA. CarrMayor of Georgetown, OhioIn office1837–1839Preceded byGeorge K. SnyderSucceeded byJ. T. Smiley Personal detailsBorn(1794-01-23)January 23, 1794Greensburg, Pennsylvania, U.S.DiedJune 29, 1873(1873-06-29) (aged 79)Covington, Kentucky, U.S.Polit...

Breakup at a Wedding

2013 American filmBreakup at a WeddingDirected byVictor QuinazWritten byAnna Martemucci Victor Quinaz Philip QuinazProduced byAnna Martemucci Victor Quinaz Zachary Quinto Neal Dodson Corey Moosa Sean Akers Steve GolinRichard BrownStarringAlison Fyhrie Philip QuinazVictor QuinazMary GrillChris ManleyDamian LaniganAnna MartemucciBrian ShoafCaitlin FitzgeraldHugh ScullyCinematographyGiovanni P. AutranEdited byCharlie Porter Evan LeedGiovanni P. AutranProductioncompaniesBefore the Door Pictures A...

 

Awata no Mahito

Awata no Mahito粟田真人Illustration by Kikuchi Yōsai, from Zenken KojitsuDiedFebruary 28, 719 In this Japanese name, the surname is Awata. Awata no Mahito (粟田 真人, ? – February 28, 719) was a Japanese nobleman of the late Asuka period and early Nara period. Life Mahito was born into the Awata family, descended from the Wani clan (和珥氏) and Kasuga clan (春日氏) and based in Yamashiro Province. In 681, Mahito was conferred the rank of shōkin-ge (小錦下), correspon...