# Lacrimal Gland: Anatomy and Tear Production

The lacrimal gland is a tubuloacinar exocrine gland positioned dorsolateral to the globe within the orbit, and it produces the aqueous component of the precorneal tear film. Its secretion is reflex-driven, primarily through parasympathetic fibers carried by the facial nerve (cranial nerve VII), with a smaller sympathetic contribution.

Tear production is the foundation of corneal health. Without a stable tear film, the cornea desiccates, ulcerates, and loses transparency. Every clinician who examines an eye is really assessing a system: the lacrimal glands, the meibomian glands of the eyelids, the conjunctival goblet cells, the nasolacrimal drainage apparatus, and the sensory nerves that tell the brain the ocular surface needs moisture. Understanding how these parts fit together explains why a dog with a normal-looking eye can still have a serious tear deficiency, and why removing a prolapsed gland of the third eyelid is a decision with lifelong consequences.

This article is educational and is not a substitute for veterinary diagnosis or treatment.

## Anatomy of the Lacrimal Gland

### Location and Gross Structure

The lacrimal gland sits in the dorsolateral orbit, tucked against the frontal bone and partially wrapped by the orbital fat and periorbita. In dogs and cats it is a flattened, lobulated structure, pinkish to pale tan, and often partially hidden behind the orbital rim. The gland is one of several orbital glands, and comparative anatomy work across species consistently places the lacrimal gland in this dorsolateral position with drainage into the dorsal conjunctival sac. In the great spotted woodpecker, for example, the smaller lacrimal gland drains into the dorsal conjunctival sac while the larger Harderian gland opens into the lower sac, and both are compound tubuloacinar structures [1]. That architectural pattern, a compound tubuloacinar gland draining to the dorsal fornix, is the same basic plan seen in domestic mammals.

The term "nasolacrimal gland" is sometimes used loosely to describe glands associated with the nasolacrimal drainage system. It is not a synonym for the main lacrimal gland. The lacrimal gland produces tears. The nasolacrimal apparatus collects them at the medial canthus through the puncta, carries them through the canaliculi into the lacrimal sac, and delivers them down the nasolacrimal duct to exit in the nasal cavity. Confusing the gland with the drainage pathway is one of the most common errors in student answers.

### Histology: A Tubuloacinar Exocrine Gland

Histologically, the lacrimal gland is a compound tubuloacinar gland. "Compound" means the duct system branches. "Tubuloacinar" means the secretory units combine tubular and acinar shapes. Each secretory unit is lined by columnar epithelial cells that synthesize, store, and release tear proteins and fluid. The secretory cells sit on a basement membrane, and the acini are surrounded by myoepithelial cells that contract to squeeze secretion into the duct system.

The extracellular matrix around the acini is not inert packing material. In the human lacrimal gland, the matrix is dominated by collagen III-rich networks in periacinar regions, collagen IV within basement membranes, and collagen VI surrounding acini and ducts [2]. Mechanical testing of that tissue shows it behaves as an ultra-soft viscoelastic material with compression-tension asymmetry, nonlinear stress-stretch behavior, hysteresis, and moderate stress relaxation [2]. In plain terms, the gland is built to deform and rebound as the eye moves and as secretory pressure changes, and the matrix composition supports that mechanical role.

The duct system converges into progressively larger ducts that open onto the conjunctiva of the dorsal fornix. Secretion is merocrine, meaning secretory product is released by exocytosis without loss of the cell.

### Blood Supply and Lymphatics

The lacrimal gland receives arterial supply from branches of the ophthalmic artery, with venous drainage into the orbital veins. Lymphatic drainage follows the orbital and parotid pathways. These details matter clinically because the gland can enlarge from inflammation, infiltration, or neoplasia, and imaging findings of a diffusely enlarged lacrimal gland have real diagnostic weight. In humans with thyroid eye disease, lacrimal gland enlargement on MRI is associated with worse proptosis, decreased tear film break-up time, and increased Schirmer I test values compared with patients whose glands are normal in size [3]. That pattern illustrates a general principle: an enlarged gland is not automatically a dry eye, and in some disease states it can oversecrete.

## Innervation: How the Brain Tells the Gland to Secrete

### Parasympathetic Pathway via the Facial Nerve

The dominant driver of aqueous tear production is the parasympathetic nervous system, and the pathway runs with the facial nerve (VII). The sequence is:

1. Sensory fibers from the cornea and conjunctiva (trigeminal nerve, V) detect irritation, dryness, or a foreign body.
2. Those signals reach the brainstem, specifically the superior salivatory nucleus.
3. Preganglionic parasympathetic fibers leave with the facial nerve, travel through the greater petrosal nerve, and synapse in the pterygopalatine ganglion.
4. Postganglionic fibers travel with the zygomatic branch of the facial nerve and the lacrimal nerve to reach the gland.
5. Acinar cells release fluid and protein into the ducts, and tears flow onto the ocular surface.

This is a reflex arc, and it is why corneal irritation produces tearing. Damage anywhere along the arc reduces tear production. A murine study of corneal sensory nerve injury found a 35% reduction in tear secretion and a 31% decrease in c-FOS-positive neurons among choline acetyltransferase-expressing neurons in the superior salivatory nucleus, which is direct evidence that the sensory input to that nucleus drives lacrimal output [4]. The same study found that basic fibroblast growth factor treatment restored tear secretion by 22% and promoted nerve regeneration, though nerve fiber recovery was incomplete [4].

### Sympathetic Supply

Sympathetic fibers reach the lacrimal gland from the superior cervical ganglion via the internal carotid plexus and orbital branches. Sympathetic stimulation contributes to protein secretion and modulates blood flow, but it is a minor player compared with the parasympathetic drive. Aging research in humans and animal models shows that lacrimal gland aging involves diminished parasympathetic and sympathetic innervation together, along with acinar attrition, ductal-stromal fibrosis, and mitochondrial fragmentation with lipofuscin accumulation [5]. The loss of both limbs of autonomic input helps explain why tear volume and tear composition both decline with age.

### Why Denervation Matters Clinically

Facial nerve palsy is the classic clinical example. A patient with facial paralysis can lose reflex tearing on the affected side because the efferent limb of the reflex is interrupted. A surgical technique called lacrimal gland neurotization, in which a sural nerve graft is used to reconnect the gland to a functioning nerve supply, has been described for patients with neurodeprivative dry eye from facial palsy, with long-term follow-up reported in a small case series [6]. The concept confirms the anatomy: the gland is intact but disconnected, and restoring the connection restores function.

## The Three Layers of the Tear Film

The tear film is not a single fluid. It is a structured, three-layer film that must remain stable between blinks.

### Lipid Layer (Outermost)

The lipid layer is the outermost component of the tear film. It is produced by the meibomian glands, which are modified sebaceous glands embedded in the tarsal plates of the upper and lower eyelids. Their lipid secretion, called meibum, spreads across the aqueous layer with each blink and forms a hydrophobic barrier that slows evaporation. Molecular modeling of the tear film lipid layer shows it maintains ocular hydration, protects the corneal surface, preserves visual clarity, and minimizes evaporative water loss, and disruption of its structural organization or chemical composition compromises that function [7]. Shear thinning behavior and viscoelastic properties of the lipid layer are consistent with what spectroscopy has shown experimentally [7].

Meibomian gland dysfunction is the leading cause of evaporative dry eye disease [8]. In affected patients, meibum lipidomics shows increased phospholipids and cholesteryl esters, and tear film bacterial isolates show increased abundance of Gram-negative bacteria, a significant reduction in the genus Bacillus, and markedly higher biofilm-forming capacity [8]. This links the ocular surface microbiome to lipid composition and tear film stability.

### Aqueous Layer (Middle)

The aqueous layer is the thickest layer and is produced by the lacrimal gland, with additional contribution from the accessory lacrimal glands of Krause and Wolfring located in the conjunctival fornices. It contains water, electrolytes, proteins, enzymes such as lysozyme and lactoferrin, immunoglobulins, growth factors, and metabolites. It nourishes the avascular corneal epithelium, washes away debris, and provides antimicrobial defense.

The aqueous layer is what the Schirmer tear test measures. A standardized strip of filter paper is placed in the lower conjunctival fornix for one minute, and the length of wetting in millimeters is recorded. A phenol red thread test is an alternative that uses a thread rather than paper and is often better tolerated in small patients. Both tests assess reflex and basal tear production together.

Proteomic analysis of tear film in dogs and cats has revealed a complex protein composition including molecules involved in inflammation, oxidative stress, immune regulation, and cellular homeostasis, which is why tears are being studied as noninvasive biomarkers in veterinary patients [9]. Tear fluid also contains measurable hormones. A published protocol describes adapting commercial enzyme-linked immunosorbent assay kits to quantify 17β-estradiol and testosterone in basal tears collected with microcapillary tubes, which shows how sensitive modern tear analysis has become [10].

### Mucin Layer (Innermost)

The mucin layer is produced primarily by conjunctival goblet cells. Mucins are glycoproteins that convert the hydrophobic corneal epithelium into a wettable surface. Without mucin, the aqueous layer beads up and cannot spread evenly, and the tear film breaks apart between blinks.

Goblet cell number and function are therefore central to tear film stability. In a study of atopic dermatitis patients receiving dupilumab, reduced conjunctival goblet cells at baseline were associated with lower tear fluid BDNF and higher VEGF-A, PDGF-BB, and MCP-1, and patients who developed ocular surface disease showed elevated IL-9, IL-16, and GM-CSF in tears [11]. The takeaway for veterinary students is that mucin deficiency is not a rare curiosity. It is a recognized mechanism of tear film instability, and it can coexist with aqueous deficiency in the same patient.

### Summary Table: Tear Film Components and Their Sources

| Layer | Position | Primary source | Main function | Clinical test or marker |
|--|--|--|--|--|
| Lipid | Outermost | Meibomian glands of the eyelids | Reduces evaporation, stabilizes the film, maintains optical clarity | Meibomian gland expression, lipid layer interferometry, meibum lipidomics |
| Aqueous | Middle | Lacrimal gland and accessory lacrimal glands (Krause, Wolfring) | Nourishes cornea, washes debris, antimicrobial defense, carries proteins | Schirmer tear test, phenol red thread test, tear proteomics |
| Mucin | Innermost | Conjunctival goblet cells | Makes the corneal surface wettable, anchors the aqueous layer | Conjunctival impression cytology, goblet cell counts |

## Comparative Anatomy: Dogs, Cats, and Other Species

### The Gland of the Third Eyelid in Dogs

In dogs, the gland of the third eyelid (nictitating membrane) contributes significantly to tear production. It sits at the base of the third eyelid, wrapped around the cartilage that supports the membrane, and it produces a large share of the aqueous tear volume. This is why the condition commonly called "cherry eye," a prolapse of the gland of the third eyelid, is more than a cosmetic problem. Surgical removal of the prolapsed gland reduces total tear production and increases the long-term risk of keratoconjunctivitis sicca. The standard of care is to reposition and anchor the gland rather than excise it.

### The Gland of the Third Eyelid in Cats

Cats have a similar arrangement. The gland of the third eyelid is well developed and contributes meaningfully to the aqueous tear film. Feline patients with prolapse of this gland are managed with repositioning for the same reason. Cats also have prominent meibomian glands and conjunctival goblet cells, so all three tear film layers are represented.

### Other Species Notes

Avian species have both a Harderian gland and a lacrimal gland in the orbit, and both contribute to the tear film, nictitating membrane function, and local protection of the ocular surface [1]. In the great spotted woodpecker, the Harderian gland is larger and drains into the lower conjunctival sac, while the lacrimal gland is smaller and drains into the dorsal conjunctival sac [1]. Rabbits, rodents, and many other mammals follow the general mammalian pattern with a lacrimal gland plus a Harderian gland, though the relative sizes and secretory profiles differ.

## Reflex Tearing and the Lacrimal Functional Unit

Basal tearing maintains the ocular surface between blinks. Reflex tearing is the surge of tears triggered by corneal irritation, a foreign body, wind, bright light, or chemical exposure. The reflex depends on an intact corneal sensory nerve supply, an intact brainstem relay, and an intact parasympathetic efferent pathway.

The concept that ties this together is the lacrimal functional unit: the lacrimal gland, meibomian glands, conjunctival goblet cells, ocular surface epithelium, and the sensory and autonomic nerves that connect them [12]. When any component fails, the whole unit destabilizes. Tear film disorders arise from dysfunction of this unit, and current treatments remain largely palliative, which is why regenerative approaches such as stem cell therapy, tissue engineering of the lacrimal gland, neurotrophic factor supplementation, [gene therapy](/blog/guides/gene-therapy), and biomaterial-assisted delivery are under active investigation [12].

The circadian dimension is easy to overlook. A murine study found that corneal sensory nerve injury altered circadian rhythm [gene expression](/blog/guides/gene-expression) in the lacrimal gland, with a 2.13-hour delay in peak expression and changes in the number and types of rhythmic genes [4]. Tear production is not constant across the day, and disease can disrupt that rhythm.

## How Lacrimal Function Is Assessed in Practice

A complete tear assessment includes several steps.

1. **Schirmer tear test.** A standardized paper strip is placed in the lower fornix for one minute. The wetting length in millimeters is recorded. Values are compared against species-specific reference intervals.
2. **Phenol red thread test.** A thread changes color as it absorbs tears. This test is useful in small or sensitive patients and is used in research settings, including rodent dry eye models [13].
3. **Tear film break-up time.** Fluorescein is applied and the time until the first dry spot appears is measured. Short break-up time indicates instability, often from lipid or mucin deficiency.
4. **Corneal staining.** Fluorescein highlights epithelial defects that result from inadequate lubrication.
5. **Conjunctival impression cytology.** This samples surface cells and can quantify goblet cells, which is directly relevant to mucin production [11].
6. **Tear proteomics and biomarker assays.** Research-grade methods can detect inflammatory mediators, growth factors, and hormones in tear fluid [10][9].
7. **Imaging.** MRI can detect lacrimal gland enlargement, as demonstrated in thyroid eye disease where enlarged glands correlated with worse proptosis and altered tear film parameters [3].

## Clinical Relevance, Limitations and Common Mistakes

The lacrimal gland is vulnerable to a wide range of pathology. Inflammatory and autoimmune conditions can cause lacrimal gland enlargement, as seen in thyroid eye disease where the gland is implicated as an additional target organ alongside orbital connective tissues [3]. Infiltrative disease is rare but real: bilateral lacrimal gland amyloidosis has been reported, diagnosed by histopathology and associated with abnormal serum free light chains [14]. Neoplasia of the lacrimal gland includes adenoid cystic carcinoma, a rare and lethal malignancy in which Myb protein expression was found in 70% of cases and emerged as a prognostic indicator, while the MYB::NFIB fusion gene was detected in 47% of cases and associated with intracranial extension [15]. Benign tumors also occur. Pleomorphic adenoma of the lacrimal gland is a benign epithelial neoplasm that can undergo cystic degeneration and mimic a dermoid cyst on imaging, as described in a case where the correct diagnosis required histopathology after excision [16].

Age-related changes deserve attention in veterinary patients as well as humans. Lacrimal gland aging involves acinar attrition, ductal-stromal fibrosis, mitochondrial fragmentation with lipofuscin accumulation, and diminished parasympathetic and sympathetic innervation, with oxidative stress, mitochondrial insufficiency, cellular senescence, immunosenescence, and disrupted cholinergic and catecholaminergic signaling all converging to depress tear volume and alter composition [5]. Cross-species comparisons reveal conserved pathways alongside species-specific susceptibilities, which is relevant when choosing animal models [5].

Regenerative research is advancing. Murine lacrimal gland epithelial cells retain expression of epithelial and lacrimal-specific markers and show regulated secretory activity, and after acute injury they activate MAPK signaling with upregulation of regenerative ligands including Hbegf, Areg, Ngf, and Gdnf [17]. Human lacrimal gland cells can be grown in three-dimensional culture to form spheroids that retain morphofunctional properties of native tissue, with epithelial cells expressing Muc5AC and Na/K-ATPase [18]. Electroacupuncture has been shown to increase tear secretion and reduce corneal fluorescein staining in a scopolamine-induced mouse model of dry eye, with [lipidomic analysis](/knowledge/bioinformatics/lipidomic-analysis-a-beginner-s-guide-to-workflows-and-data-interpretation) identifying 81 metabolites and KEGG enrichment highlighting arachidonic acid pathways [19]. These are experimental findings, not clinical protocols, but they show where the field is heading.

Common mistakes students and clinicians make:

- **Confusing the lacrimal gland with the nasolacrimal duct.** The gland makes tears. The duct drains them.
- **Assuming a normal-looking eye means normal tear production.** Early keratoconjunctivitis sicca can present with subtle signs.
- **Excising a prolapsed gland of the third eyelid.** This reduces tear production permanently and increases dry eye risk.
- **Forgetting the mucin and lipid layers.** A patient can have adequate aqueous volume on a Schirmer test and still have an unstable tear film from meibomian gland dysfunction or goblet cell loss.
- **Overlooking the sensory nerve contribution.** Corneal nerve injury reduces tear secretion by disrupting the reflex arc, as shown by the 35% reduction in tear secretion in the murine model [4].
- **Treating the tear film as a static structure.** It is dynamic, viscoelastic, and circadian, and it changes with age, disease, and innervation status.

Individual patients need a veterinarian for diagnosis and treatment decisions.

## Quick Review

1. The lacrimal gland is a compound tubuloacinar exocrine gland located dorsolateral to the globe.
2. Parasympathetic innervation via the facial nerve (VII) is the dominant driver of aqueous tear secretion, with a smaller sympathetic supply.
3. The tear film has three layers: lipid from meibomian glands, aqueous from the lacrimal gland and accessory glands, and mucin from conjunctival goblet cells.
4. In dogs and cats, the gland of the third eyelid contributes significantly to tear production, which is why it should be repositioned rather than removed when prolapsed.
5. Lacrimal secretion is reflex-driven by corneal irritation through a trigeminal-facial reflex arc.
6. The lacrimal functional unit links the glands, the ocular surface, and the nerves that connect them, and dysfunction anywhere in the unit destabilizes the tear film.
7. Aging reduces both parasympathetic and sympathetic innervation to the gland, contributing to aqueous-deficient dry eye.

## Frequently Asked Questions

### What does the lacrimal gland do?

The lacrimal gland produces the aqueous layer of the tear film, which nourishes the cornea, washes away debris, and provides antimicrobial proteins.

### Where is the lacrimal gland located?

It sits dorsolateral to the globe within the orbit, partially wrapped by orbital fat and periorbita.

### Which nerve controls tear production?

The facial nerve (cranial nerve VII) carries the parasympathetic fibers that drive aqueous tear secretion, with a smaller sympathetic contribution from the superior cervical ganglion.

### What are the three layers of the tear film?

The lipid layer from meibomian glands, the aqueous layer from the lacrimal gland, and the mucin layer from conjunctival goblet cells.

### Why is the gland of the third eyelid important in dogs and cats?

It contributes significantly to tear production, so removing it during prolapse surgery increases the risk of chronic dry eye.

### What happens if tear production is inadequate?

The cornea loses lubrication, which leads to epithelial damage, ulceration, inflammation, and in severe cases loss of corneal transparency.

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