Anatomy and diseases of lacrimal apparatus free download as powerpoint presentation. Anatomy of the lacrimal apparatus human head and neck. The lacrimal apparatus is the physiologic system containing the orbital structures for tear production and drainage. Lacrimal apparatus diseases, dacryocystitis diagnosis. References to any names, marks, products, or services of third parties or hypertext links to third. Lawrence, cpot, aboc, coa, osc terms etiology the cause of a disease or abnormal condition dacryocystitisinflammation of the lacrimal sac epiphora watering of eyes due to excess secretion of tears or obstruction of the lacrimal passage. Generally seen in the lower punctum due to inflammatory exudates, foreign bodies. The gland secretes the serous transparent fluid via its excretory ducts into the lateral aspect of the superior fornix, in the space between the. The lacrimal gland, which secretes the tears, and its excretory ducts, which convey the fluid to the surface of the human eye.
Any information contained in this pdf file is automatically generated from digital material submitted to epos by third parties in the form of scientific presentations. What links here related changes upload file special pages permanent link page. The lacrimal apparatus consists of the lacrimal tear gland and a series of ducts that drain the tears into the nasal cavity. Another redeye condition commonly presenting to the primary care physician arises from abnormalities of the tear drainage system. The main anatomical structures involved in tear drainage are shown. It was not until about 50 years ago that eugene wolff described in clinical terms the basic concepts governing tear film and structure. Lacrimal fossa, formed by lacrimal bone and frontal process of maxilla. Download this books into available format 2019 update. The lacrimal apparatus is the physiological system containing the orbital structures for tear production and drainage. Oncocytic carcinoma of the right nasal side lacrimal apparatus with androgen receptor positive xiaomei ma, chunyan xia, huimin liu. Concerns about complications and treatment can be found below in questions that verified. Anatomy of lacrimal apparatus handwritten notes youtube. The functional and structural mechanisms for secreting and draining tears. Lacrimal pathways can be obstructed due to internal derangements like inflammation of the epithelial linining.
Secretory function of the lacrimal glands declines with age, and many elderly individuals develop dry eye syndrome. Medially, the trochlea is 4 millimeters from the orbital margin, forming the pulley of the superior oblique muscle tendon. The lacrimal gland, is nestled in the frontal bone in the. Media in category nasolacrimal duct obstruction the following 3 files are in this category, out of 3 total.
Lacrimal apparatus the lacrimal glandproduces tears that wash across the eye from lateral to medial to moisten and aerate the cornea. 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. Lacrimal apparatus an overview sciencedirect topics. Subsequently, it was discovered by stensen in 1662 that the lacrimal gland formed tears. The gland produces tears secreted into the lateral aspect of the superior fornix. The lacrimal apparatus apparatus lacrimalis consists of. Lacrimal gland and ducts that drain into nasal cavity lacrimal gland in orbit above lateral end of eye lacrimal secretion tears dilute saline solution containing mucus, antibodies, and lysozyme blinking spreads tears toward medial commissure tears enter paired lacrimal canaliculi via lacrimal puncta then drain into lacrimal sac and nasolacrimal duct into the. Tears are produced by the lacrimal gland in the superolateral orbit, flow. Outcomes of malignant tumors of the lacrimal apparatus. It connects the lacrimal canaliculi, which drain tears from the eyes surface, and the nasolacrimal duct, which conveys this fluid into the nasal cavity. The lacrimal gland is an exocrine gland similar to the mammary gland and salivary gland. Blepharitis is a common chronic bilateral inflammatory condition of the lid margins.
This structure looks like the body of a grasshopper. When blockage occurs within this system it may result in symptoms such as watery eyes. Anterior blepharitis involves the lid skin, eyelashes, and associated glands. Lacrimal gland and ducts that drain into nasal cavity. The conjunctiva dr shabana ali 8 is a thin mucous membrane that lines the eyelids and is reflected at the superior and inferior fornices onto the anterior surface of the eyeball. Lacrimal medical definition merriamwebster medical dictionary. The lacrimal gland has a multifaceted role in maintaining a homeostatic microenvironment for a healthy ocular surface via tear secretion. A lacrimal cannula on a 3 cc syringe filled with saline is then used to evaluate the patency of the nasolacrimal duct. We examined the lacrimal apparatus of several specimens of alligator mississippiensis anatomically, histologically, and histochemically and studied the embryogenesis of this system. Access to paid content on this site is currently suspended due to excessive activity being detected from your ip address 40. Lacrimal canaliculi two canals that begin as a lacrimal punctum or pore in the margin of the eyelid open into the lacrimal sac. The patient should be able to taste the saline in the back of their throat if the nasolacrimal duct is not obstructed. The gland is composed of lobules separated by loose connective tissue figure 1.
Choose from 421 different sets of lacrimal apparatus flashcards on quizlet. Learning objectives enumerate components of lacrimal apparatus describe each component of lacrimal apparatus. Apparatus lacrimalis definition of apparatus lacrimalis by. Media in category svg lacrimal apparatus of the human eye the following 7 files are in this category, out of 7 total. The lacrimal system consists of a superior and inferior puncta at the medial ends of upper and lower eyelids. The lacrimal gland was originally discovered by galen, but in 1574 it was better described by caracanus of milan, italy. Note that the majority approx 70% of tears travel down the lower canaliculus to enter the lacrimal sac before draining down the nasolacrimal duct into the nasal cavity. They commence from small channels in each eyelid known as the punta lacrimalia. Inflammation of the lacrimal gland is called dacryoadenitis and is commonly caused by viral or bacterial infections. Lacrimal apparatus tear film made up of three layers an outer oily layer, secreted by the meibomian glands a middle watery layer, constant secretion from conjunctival glands and reflex secretion by lacrimal gland with ocular irritation or emotion an inner mucous layer, secreted by conjunctival goblet cells. Lacrimal apparatus definition of lacrimal apparatus by. The function of the lacrimal apparatus is to produce tears, channel them to the surface of the eye where they maintain moisture, and flush debris and waste material from the ocular surface. Expression and distribution of muc16 in lacrimal gland, accessory lacrimal glands, and nasolacrimal ducts was monitored by rtpcr and immunohistochemistry. The lacrimal apparatus consists of the lacrimal gland, which secretes the aqueous layer of the tear film, the lacrimal sac, into which the tears drain, and the nasolacrimal duct, through which the tears drain into the nose.
The nasolacrimal duct, draining tears from the lacrimal sac to the. The lacrimal apparatus and precorneal tear film introduction. It may be ulcerative, because of infection by staphylococci, or seborrheic in association with. The medial wall of the orbit consists of four bones. This is the system of the body that is responsible for secreting and draining tears into the nasal cavity. Diseases of the lacrimal apparatus knowledge for medical.
Disorders of the lacrimal system pediatric practice. It is here where the lacrimal gland is located in the upper lateral region. Full text get a printable copy pdf file of the complete article 1. Pathologic condition of the almondshaped structure that produces tears or lacrimal gland. Throughout the middle ages, tears were thought to be waste products of the brain. Acini are lined with columnar secretory cells, which have been shown to secrete mucopolysaccharides, implying that the gland is a modified mucus gland. Under normal conditions, tears are produced by the lacrimal gland and drain into the nose by way of lacrimal drainage structures. Get a printable copy pdf file of the complete article 598k, or click on a. The superior duct, the smaller and shorter of the two, at first ascends and the bends. Apparatus lacrimalis article about apparatus lacrimalis by. Inflammation of the lacrimal gland is called dacryoadenitis and is commonly. These keywords were added by machine and not by the authors. A radiation oncologists guide to contouring the lacrimal.
The nasolacrimal duct possesses a distal secretory area, which is more convoluted than that of. Lacrimal sac is the upper dilated end of the nasolacrimal duct. The lacrimal apparatus consists of the lacrimal gland and the nasolacrimal drainage apparatus. Includes lacrimal gland, accessory lacrimal glands, third eyelid glands and the nasolacrimal duct. The lacrimal gland, which secretes the tears, and its. Anatomy of the lacrimal apparatus free download as powerpoint presentation. Sep 30, 2011 the lacrimal apparatus lacrimal gland secrets tears into the upper fornix of the conjunctival sac which are spread over the surface of the cornea as a tear fil slideshare uses cookies to improve functionality and performance, and to provide you with relevant advertising. The orbital portion is a circular muscle with no temporal insertion and is thought to function primarily in forcible closure. Pdf the orbit, including the lacrimal gland and lacrimal. The sac, closed above and open below, is continuous with the nasolacrimal duct. Diagnostic imaging of the nasolacrimal drainage system. The serous fluid washes over the eye and is drained at the medial c. The lacrimal gland is the tearproducing organ of the lacrimal apparatus.
Only 25% of these asymptomatic systems showed a normal drainage, confirming that physiological obstruction can exist below the lacrimal sac in normal lacrimal drainage systems. Diseases affecting drainage apparatus excretory part. The lacrimal gland, which secretes tears, lies over the upper, outer corner of the eye. The control of tears is under a multitude of inputs and sensory responses. The lacrimal apparatus include the following structures.
Lacrimal apparatus definition of lacrimal apparatus by the. Lacrimal lake lacrimal gland a dry eye or reduced tears can lead to corneal edema. Maxillary sinus lacrimal gland ethmoid sinus nasolacrimal duct palpebral lobe. Ct and mr imaging findings of tumors and tumorlike. Anatomy and diseases of lacrimal apparatus human head. The lacrimal apparatus is the physiological system containing the orbital structures for tear. Pdf dacryocystorhinostomy as a treatment modality for epiphora is commonly being performed endonasally using a nasal endoscope by. May lead to the development of dacrocystitis, conjunctivitis and keratitis. They have superficial and deep medial heads that participate in lacrimal pump function see section 4.
Lacrimal system disorders american academy of ophthalmology. Lacrimal gland is innervated by parasympathetics from facial nerve. It is under parasympathetic stimulation when more tears are produced. Mar 26, 2020 the function of the lacrimal apparatus is to produce tears, channel them to the surface of the eye where they maintain moisture, and flush debris and waste material from the ocular surface. Retrospective study of 32 patients article pdf available in croatian medical journal 453. Special senses the senses woodland hills school district. Media in category lacrimal apparatus the following 7 files are in this category, out of 7 total. Lacrimal apparatus lacrimal gland produces tears pass from lacrimal duct, across surface of eye to lacrimal canaliculi take tears from lacrimal lake to lacrimal sac down nasolacrimal duct to nasal cavity lacrimal lake lacrimal lake. The lacrimal cannula is introduced into the canaliculus followed by irrigation with the saline. The nasal side orbit including the lacrimal sac and duct was involved. However, waldapfelx states that there is a solid rod of buried cells which is present between the nasolacrimal sac and the nose. Components of lacrimal apparatus lacrimal gland lacrimal puncta lacrimal cannaliculi lacrimal sac naso lacrimal duct 3. The gland secretes the serous transparent fluid via its excretory ducts into the lateral aspect of the superior fornix, in the space between the eyeball and the eyelids.
Lacrimal drainage apparatus ophthalmology training. Case report oncocytic carcinoma of the right nasal side. A decrease in the lacrimal gland secretory function can lead to dry eye disease. The lacrimal gland is 1 component of the lacrimal apparatus that handles tear formation and transport ending with tear delivery at the. A sdvosb service disabled veteran owned small business. Its epithelium is continuous with that of the cornea. The otolaryngologist, however, often performs the definitive surgery and must, therefore, be familiar with this disease. Jul 26, 2017 handwritten notes video of anatomy of lacrimal apparatus including lacrimal gland and passages. Little is known about the lacrimal apparatus of the crocodilians. Lacrimal gland conjunctival sac lacrimal puncta lac slideshare uses cookies to improve functionality and performance, and to provide you with relevant advertising. Secretory function of the lacrimal glands declines with age, and.
Proper usage and audio pronunciation of the word lacrimal apparatus. The lacrimal sac or lachrymal sac is the upper dilated end of the nasolacrimal duct, and is lodged in a deep groove formed by the lacrimal bone and frontal process of the maxilla. This is way you get a runny nose with an excess amount of tears. Well email you at these times to remind you to study. Apr 14, 2017 the lacrimal apparatus is the physiological system containing the orbital structures for tear production and drainage. Definition of lacrimal apparatus in the dictionary.