What forms the lacrimal sac fossa?
Result: The fossa is formed by the frontal portion of the maxillary bone and the lacrimal bone. The proportion of the frontal portion of the maxillary bone is bigger than the lacrimal bone. There is about 20 degrees between the rear wall of the fossa and the coronal plane.
What is the function of the lacrimal apparatus?
The lacrimal apparatus consists of the lacrimal glands, which secrete the tears, and the lacrimal sac and ducts, which convey the tears into the nasal cavity. Secretory function of the lacrimal glands declines with age, and many elderly individuals develop “dry eye” syndrome.
What do lacrimal glands produce?
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.
Where is the lacrimal apparatus?
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.
What is lacrimal crest?
The anterior lacrimal crest is a bony projection on the frontal process of maxilla in the skull. It creates the lateral margin of the lacrimal sac fossa and is continuous with the orbital margin. The medial palpebral ligament is attached to anterior lacrimal crest.
Why are the lacrimal bones so named?
The lacrimal bone is a paired facial bone that makes up the most anterior part of the medial wall of the orbit. It is the size and shape of a fingernail and thus the smallest bone of the skull. “Lacrima” is latin for “tear”, so the name of the bone corresponds with its relation to the nearby lacrimal structures.
What is lacrimal gland tumor?
A lacrimal gland tumor is a tumor in one of the glands that produces tears. The lacrimal gland is located under the outer part of each eyebrow. Lacrimal gland tumors can be harmless (benign) or cancerous (malignant). About half of lacrimal gland tumors are benign.
What nerve stimulates the lacrimal gland?
Nerve supply The lacrimal gland is innervated by the lacrimal nerve, which is the smallest branch of the ophthalmic nerve, itself a branch of the trigeminal nerve (CN V). After the lacrimal nerve branches from the ophthalmic nerve it receives a communicating branch from the zygomatic nerve.
Can you feel lacrimal gland?
The skin overlying the lacrimal glands is usually red and swollen (See Figure 1) and may be warm and tender to palpation. Physical findings that may be associated with the enlarged glands include conjunctival injection, chemosis, and ipsilateral preauricular lymphadenopathy (See Figure 2).
How many lacrimal glands do we have?
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. 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.
Why is it called the lacrimal bone?
What is in the lacrimal groove?
The lacrimal groove is a deep groove in front of the opening of the maxillar sinus on the nasal surface of maxilla, which is converted into the nasolacrimal canal, by the lacrimal bone and inferior nasal concha. This canal opens into the inferior meatus of the nose and transmits the nasolacrimal duct.