Exocrine gland, one for each eye, that secrete tears
Lacrimal gland
Lacrimal apparatus of the right eye. The lacrimal gland is to the upper left. The right side of the picture is towards the nose.
Tear system.
a = lacrimal gland b = superior lacrimal punctum c = superior lacrimal canal d = lacrimal sac e = inferior lacrimal punctum f = inferior lacrimal canal g = nasolacrimal canal
Details
Artery
Lacrimal artery
Vein
Superior ophthalmic vein
Nerve
Lacrimal nerve
Identifiers
Latin
glandula lacrimalis
TA98
A15.2.07.057
TA2
6846
FMA
59101
Anatomical terminology
[edit on Wikidata]
The lacrimal glands are paired exocrine glands, one for each eye, found in most terrestrial vertebrates and some marine mammals, that secrete the aqueous layer of the tear film.[1] In humans, they are situated in the upper lateral region of each orbit, in the lacrimal fossa of the orbit formed by the frontal bone.[2] Inflammation of the lacrimal glands is called dacryoadenitis. The lacrimal gland produces tears which are secreted by the lacrimal ducts, and flow over the ocular surface, and then into canals that connect to the lacrimal sac. From that sac, the tears drain through the lacrimal duct into the nose.
Anatomists divide the gland into two sections, a palpebral lobe, or portion, and an orbital lobe or portion.[3] The smaller palpebral lobe lies close to the eye, along the inner surface of the eyelid; if the upper eyelid is everted, the palpebral portion can be seen.
The orbital lobe of the gland, contains fine interlobular ducts that connect the orbital lobe and the palpebral lobe.[4] They unite to form three to five main secretory ducts, joining five to seven ducts in the palpebral portion before the secreted fluid may enter on the surface of the eye. Tears secreted collect in the fornix conjunctiva of the upper lid, and pass over the eye surface to the lacrimal puncta, small holes found at the inner corner of the eyelids. These pass the tears through the lacrimal canaliculi on to the lacrimal sac, in turn to the nasolacrimal duct, which dumps them out into the nose.[5]
Lacrimal glands are also present in other mammals, such as horses.
^Schwab, Ivan R. (2012). Evolution's Witness : How Eyes Evolved. New York. p. 245. ISBN 9780195369748.{{cite book}}: CS1 maint: location missing publisher (link)
^Moore, Keith (2018). Clinically oriented anatomy. Wolters Kluwer. pp. 897–900. ISBN 9781496347213.
^Machiele, R (November 2018). "Anatomy Head and Neck". StatPearls [Internet]. PMID 30422509.
^Machiele, R (November 2018). "Anatomy, Head and Neck, Eye Lacrimal Gland". StatPearls(Internet). PMID 30422509.
^"eye, human."Encyclopædia Britannica. 2010. Encyclopædia Britannica 2010 Ultimate Reference Suite DVD 2010
The lacrimalglands are paired exocrine glands, one for each eye, found in most terrestrial vertebrates and some marine mammals, that secrete the aqueous...
Tears are a clear liquid secreted by the lacrimalglands (tear gland) found in the eyes of all land mammals. Tears are made up of water, electrolytes...
Krause's glands and Wolfring's glands (or Ciaccio's glands) are the accessory lacrimalglands of the lacrimal system of human eye. These glands are structurally...
parasympathetic secretomotor communicating branch for the lacrimalgland which it conveys to the gland. The lacrimal nerve branches from the ophthalmic nerve immediately...
lacrimal apparatus is the physiological system containing the orbital structures for tear production and drainage. It consists of: The lacrimalgland...
The lacrimal fossa (or fossa for lacrimalgland) is located on the inferior surface of each orbital plate of the frontal bone. It is smooth and concave...
alpha-amylase. Serous glands are most common in the parotid gland and lacrimalgland but are also present in the submandibular gland and, to a far lesser...
to reach the lacrimalgland. It supplies the lacrimalgland, two rectus muscles of the eye, the eyelids, and the conjunctiva. The lacrimal artery is normally...
innervation to several glands, including the nasal glands, the palatine glands, the lacrimalgland, and the pharyngeal gland. It also provides parasympathetic...
eye, including the eyebrow, eyelids, and lacrimal apparatus. The eyebrows, eyelids, eyelashes, lacrimalgland and drainage apparatus all play a crucial...
the lacrimal nerve (branch of the ophthalmic nerve of CN V1) before synapsing at the lacrimalgland. These parasympathetic to the lacrimalgland control...
preorbital gland is a paired exocrine gland found in many species of artiodactyls, which is homologous to the lacrimalgland found in humans. These glands are...
lacrimal caruncle is found at the medial canthus of the eye. It consists of skin, hair follicles, sebaceous glands, sweat glands, accessory lacrimal tissue...
duct is located, is referred to as the lacrimal fossa (or fossa for the lacrimal sac). Fossa for lacrimalgland This article incorporates text in the public...
inferior portion of one bone, the lacrimal fossa, houses the membranous lacrimal sac. Tears, from the lacrimalglands, collect in this sac during excessive...
breath holding and muscular tremor. A neuronal connection between the lacrimalgland and the areas of the human brain involved with emotion has been established...
produced by the lacrimalgland, including the accessory lacrimalgland of Wolfring. Some lacritin is produced by the meibomian gland, and by epithelial...
ceruminous, lacrimal, sebaceous, prostate and mucous. Exocrine glands are one of two types of glands in the human body, the other being endocrine glands, which...
to collect tears produced by the lacrimalglands. The fluid is conveyed through the lacrimal canaliculi to the lacrimal sac, and thence via the nasolacrimal...
as Lacrimal ducts Lacrimal fossa (disambiguation) Lacrimal fluid, see Tears LacrimalglandLacrimal groove, also known as Lacrimal sulcus Lacrimal hamulus...
supplies the lacrimalgland, paranasal sinuses, glands of the mucosa of the nasal cavity and pharynx, the gingiva, and the mucous membrane and glands of the...
alveolar glands are classified as follows: Alveoli of lacrimalgland. Human submaxillary gland. At the right is a group of mucous alveoli, at the left...
secretomotor activity can be seen with the lacrimalgland, which secretes the aqueous layer of the tear film. The lacrimal branch of the ophthalmic nerve (itself...
glands of the human body There are several specialized glands within the human integumentary system that are derived from apocrine or sebaceous gland...
along the superior edge of the lateral rectus muscle to supply the lacrimalgland, eyelids and conjunctiva. The ophthalmic artery then turns medially...
chain of nerves that provide secretomotor innervation to the lacrimalgland and mucosal glands of nasal cavity and palate.[citation needed] Preganglionic...
Dacryoadenitis is inflammation of the lacrimalglands. Swelling of the outer portion of the upper lid, with possible redness and tenderness Pain in the...
accessory to the lacrimalgland, secreting fluid that eases movement of the nictitating membrane. Research has proposed that the gland has several other...
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