The Orbital Region and the Eye
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MR Imaging of the Orbital Apex
J Korean Radiol Soc 2000;4 :26 9-0 6 1 6 MR Imaging of the Orbital Apex: An a to m y and Pat h o l o g y 1 Ho Kyu Lee, M.D., Chang Jin Kim, M.D.2, Hyosook Ahn, M.D.3, Ji Hoon Shin, M.D., Choong Gon Choi, M.D., Dae Chul Suh, M.D. The apex of the orbit is basically formed by the optic canal, the superior orbital fis- su r e , and their contents. Space-occupying lesions in this area can result in clinical d- eficits caused by compression of the optic nerve or extraocular muscles. Even vas c u l a r changes in the cavernous sinus can produce a direct mass effect and affect the orbit ap e x. When pathologic changes in this region is suspected, contrast-enhanced MR imaging with fat saturation is very useful. According to the anatomic regions from which the lesions arise, they can be classi- fied as belonging to one of five groups; lesions of the optic nerve-sheath complex, of the conal and intraconal spaces, of the extraconal space and bony orbit, of the cav- ernous sinus or diffuse. The characteristic MR findings of various orbital lesions will be described in this paper. Index words : Orbit, diseases Orbit, MR The apex of the orbit is a complex region which con- tains many nerves, vessels, soft tissues, and bony struc- Anatomy of the orbital apex tures such as the superior orbital fissure and the optic canal (1-3), and is likely to be involved in various dis- The orbital apex region consists of the optic nerve- eases (3). -
Biology 152 – Brain/Spinal Cord/Ear/Eye Objectives
Biology 152 – Brain/Spinal Cord/Ear/Eye Objectives Items will be identified on a sheep's brain dissection, human brain models, sagittal/coronal sections of human brains in plastic, ear and eye models, and an eye dissection. You will need to learn a proper function for each listed item for the practical. BRAIN REGIONS – learn their names, position in the brain, and functions Meninges – protective tissue layers around the brain and spinal cord Dura mater strong mother, collagenous layer with dural sinuses, protects brain and allows reabsorption of CSF into blood stream Arachnoid arachnoid villi “pooch” into dural sinus to allow CSF loss to blood, holds membrane CSF and allows circulation around brain/spine Pia mater weak mother, holds shape of brain and allows diffusion of nutrients and wastes between tissues and CSF Cerebrum – two hemispheres where all conscious thought occurs L/R Hemispheres dual hard drives that control behavior and store all memory Cerebral cortex thin gray matter (nonmyelinated) layer that stores information Frontal lobe site of voluntary motor control, behavior, and intelligence Parietal lobe site of gustatory (taste) storage, special sense/navigation ability Temporal lobe site of olfactory and auditory memory storage Occipital lobe site of visual memory storage Precentral gyrus primary motor cortex router connecting frontal lobe to muscles Postcentral gyrus primary somatosensory router connecting senses to posterior brain regions Central sulcus low spot in cerebrum dividing all motor from all sensory areas Gyri/sulci -
Questions on Human Anatomy
Standard Medical Text-books. ROBERTS’ PRACTICE OF MEDICINE. The Theory and Practice of Medicine. By Frederick T. Roberts, m.d. Third edi- tion. Octavo. Price, cloth, $6.00; leather, $7.00 Recommended at University of Pennsylvania. Long Island College Hospital, Yale and Harvard Colleges, Bishop’s College, Montreal; Uni- versity of Michigan, and over twenty other medical schools. MEIGS & PEPPER ON CHILDREN. A Practical Treatise on Diseases of Children. By J. Forsyth Meigs, m.d., and William Pepper, m.d. 7th edition. 8vo. Price, cloth, $6.00; leather, $7.00 Recommended at thirty-five of the principal medical colleges in the United States, including Bellevue Hospital, New York, University of Pennsylvania, and Long Island College Hospital. BIDDLE’S MATERIA MEDICA. Materia Medica, for the Use of Students and Physicians. By the late Prof. John B Biddle, m.d., Professor of Materia Medica in Jefferson Medical College, Phila- delphia. The Eighth edition. Octavo. Price, cloth, $4.00 Recommended in colleges in all parts of the UnitedStates. BYFORD ON WOMEN. The Diseases and Accidents Incident to Women. By Wm. H. Byford, m.d., Professor of Obstetrics and Diseases of Women and Children in the Chicago Medical College. Third edition, revised. 164 illus. Price, cloth, $5.00; leather, $6.00 “ Being particularly of use where questions of etiology and general treatment are concerned.”—American Journal of Obstetrics. CAZEAUX’S GREAT WORK ON OBSTETRICS. A practical Text-book on Midwifery. The most complete book now before the profession. Sixth edition, illus. Price, cloth, $6.00 ; leather, $7.00 Recommended at nearly fifty medical schools in the United States. -
Neuromuscular Organisation of Mammalian Extraocular Muscles
Rapporter fra Høgskolen i Buskerud nr. 36 RAPPORT RAPPORT Neuromuscular organisation of mammalian extraocular muscles Inga-Britt Kjellevold Haugen (M.Phil) Rapporter fra Høgskolen i Buskerud Nr. 36 Neuromuscular organisation of mammalian extraocular muscles Inga-Britt Kjellevold Haugen (M.Phil) Kongsberg 2002 HiBus publikasjoner kan kopieres fritt og videreformidles til andre interesserte uten avgift. En forutsetning er at navn på utgiver og forfatter(e) angis - og angis korrekt. Det må ikke foretas endringer i verket. ISBN 82-91116-52-0 ISSN 0807-4488 2 CONTENTS 1. PREFACE ...................................................................................................................................... 4 2. ACKNOWLEDGEMENT............................................................................................................. 5 3. INTRODUCTION ......................................................................................................................... 6 4. LITERATURE REVIEW OF MAMMALIAN EXTRAOCULAR MUSCLES .................... 10 4.1 MUSCLE HISTOLOGY .................................................................................................................. 14 4.1.1 Ultrastructure and physiology ............................................................................................. 14 4.1.2 Fibre classification and distribution .................................................................................... 21 4.1.3 Motor innervation ............................................................................................................... -
Surgical Anatomy of the Upper Eyelid Relating to Upper Blepharoplasty Or Blepharoptosis Surgery
Review Article http://dx.doi.org/10.5115/acb.2013.46.2.93 pISSN 2093-3665 eISSN 2093-3673 Surgical anatomy of the upper eyelid relating to upper blepharoplasty or blepharoptosis surgery Kun Hwang Department of Plastic Surgery and Center for Advanced Medical Education by BK21 Project, Inha University School of Medicine, Incheon, Korea Abstract: Eyelid anatomy, including thickness measurements, was examined in numerous age groups. The thickest part of the upper eyelid is just below the eyebrow (1.127±238 μm), and the thinnest near the ciliary margin (320±49 μm). The thickness of skin at 7 mm above the eyelashes was 860±305 μm. The results revealed no significant differences among the age groups. Fast fibers (87.8±3.7%) occupied a significantly larger portion of the orbicularis oculi muscle (OOM) than nonfast fibers (12.2±3.7%). The frontalis muscle passed through and was inserted into the bundles of the OOM on the superior border of the eyebrow at the middle and medial portions of the upper eyelid. Laterally, the frontalis muscle inserted about 0.5 cm below the superior border of the eyebrow. Fast fibers occupied a significantly larger portion of the OOM than did non-fast fibers. The oculomotor nerve ends that extend forward to the distal third of the levator muscle are exposed and vulnerable to local anesthetics and may be numbed during blepharoplasty. The orbital septum consists of 2 layers. The outer layer of loose connective tissue descends to interdigitate with the levator aponeurosis and disperses inferiorly. The inner layer follows the outer layer, then reflects and continues posteriorly with the levator sheath. -
Eyelid Conjunctival Tumors
EYELID &CONJUNCTIVAL TUMORS PHOTOGRAPHIC ATLAS Dr. Olivier Galatoire Dr. Christine Levy-Gabriel Dr. Mathieu Zmuda EYELID & CONJUNCTIVAL TUMORS 4 EYELID & CONJUNCTIVAL TUMORS Dear readers, All rights of translation, adaptation, or reproduction by any means are reserved in all countries. The reproduction or representation, in whole or in part and by any means, of any of the pages published in the present book without the prior written consent of the publisher, is prohibited and illegal and would constitute an infringement. Only reproductions strictly reserved for the private use of the copier and not intended for collective use, and short analyses and quotations justified by the illustrative or scientific nature of the work in which they are incorporated, are authorized (Law of March 11, 1957 art. 40 and 41 and Criminal Code art. 425). EYELID & CONJUNCTIVAL TUMORS EYELID & CONJUNCTIVAL TUMORS 5 6 EYELID & CONJUNCTIVAL TUMORS Foreword Dr. Serge Morax I am honored to introduce this Photographic Atlas of palpebral and conjunctival tumors,which is the culmination of the close collaboration between Drs. Olivier Galatoire and Mathieu Zmuda of the A. de Rothschild Ophthalmological Foundation and Dr. Christine Levy-Gabriel of the Curie Institute. The subject is now of unquestionable importance and evidently of great interest to Ophthalmologists, whether they are orbital- palpebral specialists or not. Indeed, errors or delays in the diagnosis of tumor pathologies are relatively common and the consequences can be serious in the case of malignant tumors, especially carcinomas. Swift diagnosis and anatomopathological confirmation will lead to a treatment, discussed in multidisciplinary team meetings, ranging from surgery to radiotherapy. -
Relation of Macular and Other Holes to the Insertion of the Inferior Oblique
Br J Ophthalmol: first published as 10.1136/bjo.47.2.90 on 1 February 1963. Downloaded from Brit. J. Ophthal. (1963) 47, 90. RELATION OF MACULAR AND OTHER HOLES TO THE INSERTION OF THE INFERIOR OBLIQUE* WITH A NOTE ON THE TOPOGRAPHY OF THE POSTERIOR SURFACE OF THE GLOBE BY ANWAR EL MASSRI Faculty ofMedicine, Ein-Shams University, Cairo THE macular region, like the peripheral retina, is liable to cystic degeneration, especially in high myopes and in old people. This gives a honeycomb appearance and on rupture of the cyst or cysts by slight or severe trauma a depression is produced which may be confined to the inner layers of the retina or form a macular hole. A hole may occur in a normal macula immediately after trauma or after an interval during which probably cystic degeneration has developed. A macular hole may also be formed in the process of retrac- tion of the vitreous if the macula is previously diseased or affected. These holes are always round or oval with a punched appearance. Multiple holes are rare. They may or may not be accompanied by retinal detachment. copyright. It seems that relationship exists between the formation of a macular hole and the contraction of the inferior oblique muscle (el Massri, 1958). In about five out of nine cases, the hole is accompanied by a peripheral tear or an area of degeneration at about 7 to 8 o'clock in the right eye or 4 to 5 o'clock in the left. At operation the peripheral tears were seen to be situated of the insertion of over the lateral end the inferior oblique. -
Tentorium Cerebelli: the Bridge Between the Central and Peripheral Nervous System, Part 2
Open Access Review Article DOI: 10.7759/cureus.5679 Tentorium Cerebelli: the Bridge Between the Central and Peripheral Nervous System, Part 2 Bruno Bordoni 1 , Marta Simonelli 2 , Maria Marcella Lagana 3 1. Cardiology, Foundation Don Carlo Gnocchi, Milan, ITA 2. Osteopathy, French-Italian School of Osteopathy, Pisa, ITA 3. Radiology, IRCCS Fondazione Don Carlo Gnocchi Onlus, Milan, ITA Corresponding author: Bruno Bordoni, [email protected] Abstract The tentorium cerebelli is a meningeal portion in relation to the skull, the nervous system, and the cervical tract. In this second part, the article discusses the systematic tentorial relationships, such as the central and cervical neurological connections, the venous circulation and highlights possible clinical alterations that could cause pain. To understand the function of anatomy, we should always remember that every area of the human body is never a segment, but a functional continuum. Categories: Physical Medicine & Rehabilitation, Anatomy, Osteopathic Medicine Keywords: tentorium cerebelli, fascia, pain, venous circulation, neurological connections, cranio Introduction And Background Cervical neurological connections The ansa cervicalis characterizes the first cervical roots and connects all anterior cervical nerve exits with the inferior floor of the oral cavity, the trigeminal system, the respiratory control system, and the sympathetic system. The descending branch of the hypoglossal nerve anastomoses with C1, forming the ansa hypoglossi or ansa cervicalis superior [1]. The inferior root of the ansa cervicalis, also known as descendens cervicalis, is formed by ascendant fibers from spinal nerves C2-C3 and occasionally fibers C4, lying anteriorly to the common carotid artery (it passes laterally or medially to the internal jugular vein upon anatomical variations) [1]. -
The Orbit Is Composed Anteri
DAVID L. PARVER, MD The University of Texas Southwestern Medical Center, Dallas Theability to successfully assess and treat The Orbit physical ailments requires an understanding of the anatomy involved in the injury or The eye itself lies within a protective shell trauma. When dealing with injuries and called the bony orbits. These bony cavities are trauma associated with the eye, it is neces- located on each side of the root of the nose. sary to have a work- Each orbit is structured like a pear with the ing knowledge of optic nerve, the nerve that carries visual im- basic ocular anatomy pulses from the retina to the brain, represent- so that an accurate ing the stem of the orbtt (Duke-Elder, 1976). Understa eye also diagnosis can be Seven bones make up the bony orbit: frontal, achieved and treat- zygomatic, maxillary, ethmoidal, sphenoid, ment can be imple- lacrimal, and palatine (Figures 1 and 2). in a bony " mented. The roof of the orbit is composed anteri- . .. The upcoming ar- orly of the orbital plate of the frontal bone ticles in this special and posteriorly by the lesser wing of the sphe- Each portion of the 01 I noid bone. The lateral wall is separated from .r. theme section the nervc an eye will deal specifically 2 with recognizing ocular illness, disease, and injuries, and will also address the incidence of sports related eye injuries and trauma. This paper covers the ba- sics of eye anatomy, focusing on the eye globe and its surrounding struc- tures. Once one gains an understand- ing of the normal anatomy of the eye, it will be easier to recognize trauma, injury, or illness. -
Evisceration, Enucleation and Exenteration
CHAPTER 10 EVISCERATION, ENUCLEATION AND EXENTERATION This chapter describes three operations that either remove the contents of the eye (evisceration), the eye itself (enucleation) or the whole orbital contents (exenteration). Each operation has specific indications which are important to understand. In many cultures the removal of an eye, even if blind, is resisted. If an eye is very painful or grossly disfigured an operation will be accepted more readily. However, if the eye looks normal the patient or their family may be very reluctant to accept its removal. Therefore tact, compassion and patience are needed when recommending these operations. ENUCLEATION AND EVISCERATION There are several reasons why either of these destructive operations may be necessary: 1. Malignant tumours in the eye. In the case of a malignant tumour or suspected malignant tumour the eye should be removed by enucleation and not evisceration.There are two important intraocular tumours, retinoblastoma and melanoma and for both of them the basic treatment is enucleation. Retinoblastoma is a relatively common tumour in early childhood. At first the growth is confined to the eye. Enucleation must be carried out at this stage and will probably save the child’s life. It is vital not to delay or postpone surgery. If a child under 6 has a blind eye and the possibility of a tumour cannot be ruled out, it is best to remove the eye. Always examine the other eye very carefully under anaesthetic as well. It may contain an early retinoblastoma which could be treatable and still save the eye. Retinoblastoma spreads along the optic nerve to the brain. -
98796-Anatomy of the Orbit
Anatomy of the orbit Prof. Pia C Sundgren MD, PhD Department of Diagnostic Radiology, Clinical Sciences, Lund University, Sweden Lund University / Faculty of Medicine / Inst. Clinical Sciences / Radiology / ECNR Dubrovnik / Oct 2018 Lund University / Faculty of Medicine / Inst. Clinical Sciences / Radiology / ECNR Dubrovnik / Oct 2018 Lay-out • brief overview of the basic anatomy of the orbit and its structures • the orbit is a complicated structure due to its embryological composition • high number of entities, and diseases due to its composition of ectoderm, surface ectoderm and mesoderm Recommend you to read for more details Lund University / Faculty of Medicine / Inst. Clinical Sciences / Radiology / ECNR Dubrovnik / Oct 2018 Lund University / Faculty of Medicine / Inst. Clinical Sciences / Radiology / ECNR Dubrovnik / Oct 2018 3 x 3 Imaging technique 3 layers: - neuroectoderm (retina, iris, optic nerve) - surface ectoderm (lens) • CT and / or MR - mesoderm (vascular structures, sclera, choroid) •IOM plane 3 spaces: - pre-septal •thin slices extraconal - post-septal • axial and coronal projections intraconal • CT: soft tissue and bone windows 3 motor nerves: - occulomotor (III) • MR: T1 pre and post, T2, STIR, fat suppression, DWI (?) - trochlear (IV) - abducens (VI) Lund University / Faculty of Medicine / Inst. Clinical Sciences / Radiology / ECNR Dubrovnik / Oct 2018 Lund University / Faculty of Medicine / Inst. Clinical Sciences / Radiology / ECNR Dubrovnik / Oct 2018 Superior orbital fissure • cranial nerves (CN) III, IV, and VI • lacrimal nerve • frontal nerve • nasociliary nerve • orbital branch of middle meningeal artery • recurrent branch of lacrimal artery • superior orbital vein • superior ophthalmic vein Lund University / Faculty of Medicine / Inst. Clinical Sciences / Radiology / ECNR Dubrovnik / Oct 2018 Lund University / Faculty of Medicine / Inst. -
Lid and Lash Conditions
Perth Veterinary Ophthalmology Lid and Lash Conditions Eyelid Diseases The most common eyelid diseases are entropion, ectropion and facial droop. Entropion Entropion means a turning in of the lids. This is a common complaint in young dogs but can sometimes affect older dogs and cats as well. Most cases in young dogs affect the lower lids, but the upper lid can become affected in later life in some breeds such as Cocker Spaniels and Bloodhounds. Entropion Some breeds such as Shar Peis, Chows, Rottweillers and Mastiffs can have very complex entropion leading to defects in both upper and lower lids. A Shar Pei with severe upper and lower lid entropion Entropion is painful and can be potentially blinding. The rolling in of the lid leads to hair coming into contact with the cornea, leading to pain, ulceration and scarring (which can affect vision). In severe cases this can even lead to perforation of the eye. There are many causes of entropion. It can be primary or secondary to other problems affecting the lids (such as ectopic cilia, distichiasis etc. - see below). Some possible causes include the lid being too long, the lid being too tight, instability of the lateral canthus (outer cornea of the eyelids), misdirection of the lateral canthal tendon, brachycephalic anatomy (big eyes and short nose - e.g. Pekingese, Pugs, Shih Tsus, Persian cats etc.), diamond eye defects, loose or too much skin, facial droop etc. Often these cases are referred to a veterinary ophthalmologist for proper assessment and treatment to provide the best outcome. Entropion requires surgical correction.