What are the parts of the lacrimal system?
The lacrimal system consists of the lacrimal gland, the gland of the third eyelid, the accessory glands of Krause and Wolfring, the glands of Zeis, the tarsal glands, and the nasolacrimal duct system. The lacrimal gland lies in the dorsolateral wall of the orbit between the dorsolateral wall of the orbit and the globe.
What is the pathway of the lacrimal apparatus?
Lacrimal gland
| Structure | Two parts: Orbital and palpebral |
|---|---|
| Pathway of tears | Lacrimal gland → lacrimal ducts → ocular surface → lacrimal puncta → lacrimal canaliculi → lacrimal sac → nasolacrimal duct → inferior nasal meatus → nasopharynx |
How many lacrimal apparatus are there?
Lacrimal gland The gland is divided into two sections anatomically. These are the small palpebral portion that lies closer to the eye, and the orbital portion that forms around four ducts. These ducts then combine with the 6 ducts of the palpebral portion, and are secreted onto the surface of the eye.
How does the lacrimal apparatus work?
The lacrimal apparatus is the system responsible for the drainage of lacrimal fluid from the orbit. After secretion, lacrimal fluid circulates across the eye, and accumulates in the lacrimal lake – located in the medial canthus of the eye. From here, it drains into the lacrimal sac via a series of canals.
Where is the lacrimal apparatus of the eye?
The lacrimal gland is a bilobed, tear-shaped gland with the primary function of secreting the aqueous portion of the tear film, thereby maintaining the ocular surface. It is primarily located in the anterior, superotemporal orbit within the lacrimal fossa of the frontal bone.
What is the lacrimal apparatus structures in order as tears flow?
Tears are produced by the lacrimal gland and the accessory lacrimal glands and cover the cornea. Tears then drain out the punctum in the medial eyelids, flow down the canaliculi into the lacrimal sac. They then drain down the nasolacrimal duct into the nose at the inferior meatus (under the inferior turbinate).
What divides the lacrimal gland into two lobes?
The tendon of levator palpebrae superioris bisects the lacrimal gland, giving rise to 2 lobes: a smaller palpebral component found continuous with the inner eyelid, and a larger orbital component.
What are tear glands called?
The tear glands (lacrimal glands), located above each eyeball, continuously supply tear fluid that’s wiped across the surface of your eye each time you blink your eyelids.
Where is the lacrimal apparatus located?
orbit
The lacrimal gland is located within the orbit above the lateral end of the eye. It continually releases fluid which cleanses and protects the eye’s surface as it lubricates and moistens it. These lacrimal secretions are commonly known as tears.
Which component of the lacrimal apparatus is responsible for tear production?
The lacrimal gland, a tubuloacinar exocrine gland, secretes electrolytes, water, proteins, and mucins known as lacrimal gland fluid, into the tear film.
What is lacrimal duct?
The lacrimal duct system transmits tears from the surface of the eye to the nasal cavity. Tears enter the duct system at the lacrimal punctae and conduct through canaliculi within the eyelids. The canaliculi drain into the lacrimal sac.
What is the first part of the drainage of the lacrimal apparatus?
The lacrimal outflow system begins with the pinpoint opening, the punctum, in the medial upper and lower eyelids (Fig. 30-14).
What are lacrimal ducts?
What are the branches of lacrimal nerve?
The V1 division leaves the superior aspect of the trigeminal ganglion, lies in the lateral wall of the cavernous sinus, and enters the orbit through the superior orbital fissure, where it divides into three separate nerves: the lacrimal, frontal, and nasociliary nerves.
What is tear duct?
Tear ducts are another name for the nasolacrimal ducts. They form at the corner of your eye nearest your nose. They run underneath the skin and connect to your facial bones and nose.
What controls tear production?
The parasympathetic branch of the autonomic nervous system controls the lacrimal glands via the neurotransmitter acetylcholine through both the nicotinic and muscarinic receptors. When these receptors are activated, the lacrimal gland is stimulated to produce tears.