anatomy and physiology of lacrimal apparatus ppt 1. Presented by Dr Rohit Rao 2. Wolff's Anatomy of the Eye and Orbit. Adler's Physiology of the Eye . The Lacrimal System Diagnosis, Management, and Surgery by Adam J. Cohen, Michael Mercandetti & Brian G. Brazzo. The dry eye , a practical approach by Sudi Patel & Kenny J Blades. Jack J Kanski's clinical ophthalmology Clinical Anatomy of the. Lacrimal Apparatus • Lacrimal Apparatus -Lacrimal gland ‐located under the frontal bone at upper‐outer angle of the orbit -Lacrimal canals/ducts (6‐12) -Conjunctival sac -Puncta (um)drainage ports (2 ea eye) -Canaliculi (us) -Lacrimal sac -Nasolacrimal duct ‐drains into the nos LACRIMAL SYSTEM • The function of the lacrimal system is to create an ideal environment for visual functions of the eye. •And optimizing the nutrition and defence of the ocular surface. •It accomplished by balance between the lacrimal secretion and drainage system
Anatomy of the Lacrimal Drainage System. Fig. 1.1. Structure of the nasolacrimal drainage system. Secretory system (main and minor lacrimal glands, eyelids) that forms the tear film and hand it out on the ocular surface. Excretory system (upper and lower puncta, canaliculi, lacrimal sac, nasolacrimal duct) that drains tears from the eye to the. Drainage systems : upper,lower pancta. 12/10/12 Embryology Primitive Cord of cells derived from surface ectoderm, sequestered in the naso-maxillary groove, forms the future lacrimal drainage system. 12/10/12 Punctal. membranes open at full term; however, the membrane of Hasner remains imperforate in up to 70% newborns. This usually opens within. Tears drain . into the lacrimal puncta, which are two openings on the nasal side of the extreme edge of the eyeball. Superior and inferior . lacrimal canals . empty the tears into the . nasolacrimal sac . and . nasolacrimal duct. The right and left sided nasolacrimal ducts empty into each side of. the nos
The lacrimal drainage system includes the upper and lower puncti and canaliculi, lacrimal (tear) sac and the nasolacrimal duct. The upper canaliculi merge, just before the lacrimal sac, to form the common canaliculus. A valve at the entry point of the common canaliculus into the sac prevents backflow of tears towards the eye The ocular surface and lacrimal drainage system represent a mucosa, similar to that of the intestine and airways, along with a large associated gland, the lacrimal gland (LG). The ocular mucosa is directly and constantly exposed to the external environment, which puts it at risk of microbial invasion and allergic disease The nasolacrimal drainage system serves as a conduit for tear flow from the external eye to the nasal cavity. It consists of the puncta, canaliculi, lacrimal sac, and nasolacrimal duct (see the image below). Overview of the nasolacrimal apparatus. At 32 days' embryonic gestation, the maxillary and frontonasal prominences appear, and as these. Developmental Disorders of the Lacrimal Drainage System. Figure 9.1 Lacrimal outflow embryology. A, At 5.5 weeks of gestational age, invagination of the surface ectodermal (shown as a red line) begins to occur between the maxillary and lateral nasal processes. B, At approximately 6 weeks' gestation, this cord of ectoderm becomes buried.
Bulbar conjunctiva (cranial view) Anatomy and parts Lacrimal gland. This gland is about the size of an almond, and sits within the lacrimal fossa, located in the superior and outer edge of the orbital roof.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 Hartikainen J, Aho HJ, Seppa H, Grenman R. Lacrimal bone thickness at the lacrimal sac fossa. Ophthalmic Surg Lasers 1996;27(8):679-684. PubMed Google Schola Dacryocystitis is an inflammation affecting lacrimal sac. Lacrimal excretory system drain tears from eye to the nasal cavity. Stagnation of tears due to blockage of lacrimal drainage system can result in dacryocystitis. Lacrimal drainage system consists of:- Punctum (plural puncta): Punctum is located near the medial (inner) end of each eyelid and it joins vertical [ A.Obstruction of the lacrimal excretory system: Obstruction of the lacrimal excretory system can be either at the level of Puncta, canaliculi, lacrimal sac, or nasolacrimal duct. Various causes of obstruction in the lacrimal drainage system have already been mentioned in the evaluation of the watering section Applied anatomy of lacrimal drainage system All ducts and vessel lumina of human body are lined by an epithelium or endothelium whose health and continuity is maintained by the regular physiological cell turnover. The patency of their lumen is essentially maintained by the constant amount and continuous nature of fluid flow through these tracts
proptosis.ppt - Free download as Powerpoint Presentation (.ppt), PDF File (.pdf), Text File (.txt) or view presentation slides online. cm uplud Otolaryngology online Medial wall of orbit applied anatomy Lacrimal bone at the level of lacrimal fossa is venous drainage Both these areas share a common venous drainage Otolaryngology online. The lacrimal drainage system can be broadly divided into embryonic and fetal developments for a lucid understanding. Lacrimal Drainage System Development During Embryogenesis The lacrimal passages develop along the line of cleft between the maxillary process and the lateral nasal process Paranasal Sinuses: Anatomy and Function Glen T. Porter, MD Francis B. Quinn, MD UTMB Department of Otolaryngology Galveston, TX January 2002 - A free PowerPoint PPT presentation (displayed as a Flash slide show) on PowerShow.com - id: 3f4004-NjNi The lacrimal drainage system begins as a nest of ectodermal cells at the site of the future lacrimal sac. Cords of cells extend from this site to the eyelids and into the nares. Canalization of this tissue results in the formation of the lacrimal sac, canaliculi, and NLD. This canalization begins at the lacrimal sac and extends distally
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 Lacrimal drainage system tumors are extremely rare10. Stefanyszyn et al11 surveyed 370 lacrimal sac tumors in the previous reported literature, of which 202 (55%) were malignant. Primary neoplasms Benign primary tumors of the lacrimal drainage system expand into the lumen of the lacrimal sac and lacrimal drainage apparatus12-13. On clinical. Displaying lacrimal disorder PowerPoint Presentations Cummings Chapter 92: Oral Manifestations Of Systemic Diseases PPT Presentation Summary : The classic oral mucosal lesion of TB is a painful, deep, irregular ulcer on the dorsum of the tongue physiologic study of the lacrimal drainage system, it is limited by its suboptimal reso-lution and lack of easy availability .Both conventional MRI and CT do not show su-perior, inferior, and common canalicular pathologic findings ; therefore, some in-A B Fig. 1—Anatomy of nasolacrimal drainage apparatus Hawes M, Dortzbach R. Trauma of the lacrimal drainage system. Linberg J, ed. Lacrimal Surgery. New York: Churchill Livingstone; 1988. 241-262. Canavan YM, Archer DB. Long-term review of injuries to the lacrimal drainage apparatus. Trans Ophthalmol Soc U K. 1979 Apr. 99(1):201-4. . Linberg J. Surgical anatomy of the lacrimal system
The praeocular tear film(PTF)The praeocular tear film(PTF) Covers the cornea and conj. - prevents the eye from the dessiccation allows transport of oxigen and nutritives to the cornea by lubrication of the eye surface, helps the movement of the lids eliminates the surface-irregularities of the cornea - maximal refractive power washing out of the foreign bodies from the eye surfac The purpose of the lacrimal system is to create an ideal mucosal environment for visual functions of the eyeball, especially optimized to nutrition and defense of the cornea. This function is performed by the lacrimal production system and the lacrimal drainage system, which inevitably operates synergistically with the glandular and muscular.
Anatomy and histology of the lacrimal fluid drainage system. R Kominami Department of Anatomy II, Kanazawa Medical University, Uchinada, Ishikawa 920-0265, Japan Anatomy of the eye (cont.) • 2. Lacrimal Glands and ducts • b. nasal cavity • * Tears act to wash away or dilute the irritating substance • * Often cause swelling within the lacrimal duct system. This impairs drainage of tears from the eye surface causing watery eyes. .ppt. Bellevue College
These glands are oval and display numerous acini. There are chronic irritative symptoms.The cornea shows superficial punctate or a filamentary keratitis. The liver, gallbladder and pancreas are all accessory organs of digestion. Accessory Structures of the Eye Lacrimal apparatus Lacrimal gland- produces lacrimal fluid Lacrimal canals- drains lacrimal fluid from eyes Lacrimal sac- provides. When the eyelids are everted, small punata can be visualized in the upper and lower lids, which represent the beginning of the lacrimal drainage system. The lateral fissure contacts the ocular globe and under normal circumstances tears flow from lateral to medial to the lacrimal lakes, through the lacrimal puncta, into the canaliculi, and into. 5.5 Tears and the Lacrimal Apparatus The lacrimal apparatus consists of the lacrimal gland, the accessory lacrimal glands and the lacrimal drainage structures. The lacrimal gland is about 15mm wide, 20mm deep and 5mm thick and is located in the upper temporal (nearest the temple) region of the orbit, between the eyeball and the wall of the orbit Lacrimal System Anatomy. The lacrimal system includes the tear film of the eye and the tear drainage system. The tear film is made up of three layers. The most anterior layer is the oil layer, produced by the meibomian glands and glands of Zeis, and functions to prevent evaporation of the tear film Lacrimal Gland & Nasolacrimal Duct • lacrimal gland lies in the superotemporal part of the anterior orbit • secretes most of the aqueous component of the tear film • nasolacrimal tears drainage system - drains the tears from the eye to the nasopharyngeal cavity via the inferior meatu
The lacrimal sac and the nasolacrimal duct are lined by a double-layered epithelium (Fig. 1.5) and are surrounded by a wide ranging vascular system comparable to a cavernous body (Figs. 1.1, 1.6). The double-layered epithelium is composed of a superficial columnar layer and a deep flattened layer of basal cells The outflow component of the lacrimal system lies at the nasal side of the eye, where puncta located on the upper and lower lids drain fluid into canaliculi leading to the nasolacrimal sac and nose (Fig. 1) (Walcott, 1998). In rodents, however, the lacrimal gland is comprised of two lobular structures: one intra-orbital and the other extra-orbital Lacrimal system tear drainage system the lacrimal system is crucial for tear production and management which includes distribution of tears and draining excess tears. Malfunction in any part of the system can cause serious complications. Ppt External Anatomy Of The Eye Powerpoint Presentation A P Lab Exam 2 Study Guide Bmch 2400 Unomaha Studoc The eyelids are thin, mobile folds that cover the eyeball anteriorly.They offer protection from excessive light or injury, and maintain lubrication by distributing tears over the surface of the eyeball. The eyelids are split into upper and lower portions, which meet at the medial and lateral canthi of the eye.The opening between the two eyelids is called the palpebral aperture or opening
Nasolacrimal duct obstruction is a blockage of the lacrimal drainage system. In children the majority of nasolacrimal duct obstruction is congenital. Disease. Congenital nasolacrimal duct obstruction occurs in approximately 5% of normal newborn infants. The blockage occurs most commonly at the valve of Hasner at the distal end of the duct Canalicular trauma refers to sudden physical injury that results in damage to the lacrimal drainage system of the eye. The lacrimal canaliculi are located within the medial aspect of the eyelid. This area area is unlike the rest of the eyelid because it does not contain a tarsal substructure. Therefore, a force which displaces the eyelid from its strong attachment at the medial canthal tendon.
Irrigation of the lacrimal system provides valuable information as to the lacrimal drainage system patency. Return from the same punctum with some passage of fluid to the nose could imply canalicular stenosis. Common canalicular obstruction typically results in the return of clear fluid from the opposite punctum The anatomy of the human urinary system differs between males and females at the level of the urinary bladder. The kidney and urinary systems help the body to get rid of liquid waste called urea. Urea is produced when foods containing protein such as meat poultry and certain vegetables are broken down in the body Lacrimal System The lacrimal apparatus consists of a secretory portion, the lacrimal gland, its ducts, the drainage apparatus, the lacrimal canaliculi and sac, and the nasolacrimal duct (Fig. 1.3). The lacrimal gland is partially divided into two portions by the lateral horn of the aponeurosis of the levator palpebrae Therefore, we established a reconstructive method with a functional lacrimal drainage system, which focused on (3). During the reconstruction of lacrimal pump function linked with eyelid movement, it is important to understand detailed anatomy of medial canthal region
Developmental anatomy of nasolacrimal duct. Standardized echography in the diagnosis of lacrimal drainage dysfunction. Bartkowski SB. Lacrimal drainage system obstruction: management and. Lymphatic Vessels. The function of the lymphatic vessels is to form an elaborate drainage system that picks up excess tissue fluid, now called lymph. Lymphatics. The lymphatic vessels, also called lymphatics, form a one-way system, and lymph flows only toward the heart. Lymph capillaries Periocular anatomy. (A) Structure of the eyelids. The eyelids are suspended by tendons medially and laterally. The lacrimal gland is located at the superolateral aspect deep to the orbicularis oculi. The lacrimal drainage apparatus is protected by the anterior leaflet of the medial canthal tendon, which is cut away in this diagram
Structure Histology. The lacrimal gland is a compound tubuloacinar gland, it is made up of many lobules separated by connective tissue, each lobule contains many acini.The acini composed of large serous cells which, produce a watery serous secretion, serous cells are filled with lightly stained secretory granules and surrounded by well-developed myoepithelial cells and a sparse, vascular stroma Canthal tendons in Anatomy and physiology of the eyelids. ️ At each end, the tarsal plates are stabilized by a horizontal canthal tendon. ️ the medial canthal tendon is well developed with an anterior limb arising from the anterior lacrimal crest, and a posterior limb from the posterior lacrimal crest 4. • When eye is open, the upper lid covers about 1/6th of the cornea & the lower lid just touches the limbus. POSITION OF LIDS Lower eyelid anatomy. View Media Gallery. Lacrimal system. The lacrimal system includes the structures involved in the production and drainage of tears. The lacrimal gland is located in the lateral upper lid margin Reasons for epiphora might be insufficient drainage of the excretory nasolacrimal system, stenosis of the proximal drainage system or nasolacrimal duct, congenital atresia of the lacrimal puncta as a genetic or spontaneous anomaly, aplasia of the nasolacrimal duct, atresia of the nasolacrimal drainage system (NDS), or an undersized lacrimal sac. etica y politica spanish edition, study guide 2 scf anatomy, old telephone wiring diagram, 220v motor wiring diagram, endoscopic surgery of the lacrimal drainage system, foundations of professional nursing, yamaha marine workshop manual, much depends on dinner visser margaret, illuminated 12v lighted toggle switch wiring diagram, teach reading no
The lacrimal drainage apparatus drains tears from the eye. The system is susceptible to a multitude of pathologic findings, including obstruction, infection, inflammation, and neoplasms. The diagnosis of several of these processes is aided by the use of radiologic studies. In conjunction with dacryocystography, cross-sectional modalities, such as CT and MR imaging have improved the ability of. related to the lacrimal drainage system. It lies anterior to the canaliculi, but a deep head inserts into the posterior lacrimal crest and onto the fascia of the lacrimal sac. • Lacrimal sac (Figures 1, 3, 4 , 16 7 18): It is located in the lacrimal fossa, which is bound medially by the lacri-mal bone and the frontal process of th
Return the lid to its normal position and cut through the medial palpebral ligament. Locate the lacrimal sac in the fossa for the lacrimal sac. Consider the lacrimal canaliculi and drainage to the lacrimal sac. Understand that the lacrimal sac drains into the lower portion of the nasal cavity via the nasolacrimal duct. 5 Oculoplastic Surgery For Certified Ophthalmic Technicians Tips on Trauma, Tumors, Tearing, Thyroid, and pTosis Nicole Langelier, MD, MBE Oculoplastic and Reconstructive Surgery Fello The ant cells drain into the infundibulum of the middle meatus. Post cells drain into the superior meatus. The anatomy of the ethmoidal cells are highly variable. A cell above the orbit is called a supraorbital cell. found in 15% of pt. Invasion of an ethmoid cell into the floor of the frontal sinus is called a frontal bulla. 7/30/2012. www.
The trabecular meshwork is an area of tissue in the eye located around the base of the cornea, near the ciliary body, and is responsible for draining the aqueous humor from the eye via the anterior chamber (the chamber on the front of the eye covered by the cornea).. The tissue is spongy and lined by trabeculocytes; it allows fluid to drain into a set of tubes called Schlemm's canal which is. The system that secretes and drains tears into the nasal cavity consists of the lacrimal gland in conjunction with the upper and the lower lacrimal pathways . The upper lacrimal pathway is made up of the puncta and lacrimal canaliculi, whereas the lower lacrimal pathway contains the lacrimal sac and nasolacrimal duct Discover the muscles of facial expression in our brand-new Head & Neck model, in addition to detailed connective tissues such as the superficial musculo-aponeurotic system. To supercharge your learning with the power of 3D today, try Complete Anatomy for FREE
Dacryoadenitis: an inflammation of the lacrimal glands commonly due to a bacterial or viral infection. May present as swelling of the outer portion of the upper lid, with redness and tenderness, pain in the area of swelling, excess tearing, and swelling of the preauricular lymph nodes Anatomy of the Eye Dr. Spandana Charles MD © 2013 Pearson Education, Inc
Superior orbital fissure syndrome / Rochon-Duvigneaud syndrome. Risks. The superior orbital fissure is travels from the apex of the orbit laterally, anteriorly, and superiorly. This fissure divides the greater as well as lesser wings of the sphenoid and is located in the middle of the optic foramen and the foramen rotundum Check out this medical presentation on Ear, Nose, and Throat Facts, which is titled Diseases of the Eyes, Ears, Nose, and Throat, to gain the knowledge of the anatomy, physiology, epidemiology, pathophysiology, psychosocial impact, presentations, prognosis, and management of common or major diseases of the eyes, ears, nose, and throat, including nose bleed Dacryocystitis refers to an infection of the tear sacs, which are part of the tear drainage system in the eye. Tears drain from each eye through small canals (drainage canals), a tear sac, and a tear duct.Drainage canals are found at the inner corner of each upper and lower eyelid, and they carry away tears that have rinsed the front surface of the eye Correctly label the structures associated with the lacrimal apparatus. Lacrimal apparatus a group of organs concerned with the production and drainage of tears. Either of the two dilated ends of the lacrimal ducts at the nasal ends of the eyes that fill with tears secreted by the lacrimal glands Epiphora is the first symptom of acquired nasolacrimal duct obstruction (NLDO), which may be due to various causes, including paranasal sinuses and tumours of the nasal cavity. A 28-year-old male patient presented chronic dacryocystitis with left-sided epiphora. Endoscopically, a bulging of the lateral nasal wall at the left-sided agger nasi area was noted
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