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Muscles of orbit - Wikipedia, the free encyclopedia There are seven muscles of the orbit; one controls the movement of the upper eyelid, and six others control the movement of the eye. All of the other muscles are controlled by the third cranial nerve, the oculomotor, which is so named because it is in charge of the movement (motor) of the eye (oculo-). Levator palpebrae superioris muscle - Superior rectus muscle - Inferior rectus muscle - Lateral rectus muscle - Medial rectus muscle - Superior oblique muscle - Inferior oblique muscle en.wikipedia.org /wiki/Eye_muscle   (431 words)

eMedicine - Extraocular Muscles, Actions : Article by Robert H Graham, MD A muscle in the same eye that moves the eye in the same direction as the agonist is known as the synergist, while a muscle in the same eye that moves the eye in the opposite direction of the agonist is the antagonist. The medial rectus muscle is the primary adductor of the eye, and the lateral rectus muscle is the primary abductor of the eye. The superior rectus is an incyclotorter, and the inferior rectus is an excyclotorter. www.emedicine.com /oph/topic14.htm   (1344 words)

Medial rectus muscle - Wikipedia, the free encyclopedia The medial rectus muscle is a muscle in the orbit. As with most of the muscles of the orbit, it is innervated by the inferior division of the oculomotor nerve (Cranial Nerve III). Muscles of the Head — Neck — Trunk — Upper limb — Lower limb— LIST OF ALL MUSCLES en.wikipedia.org /wiki/Medial_rectus_muscle   (264 words)

Related WordNet synsets for SUMO concept Muscle   (Site not responding. Last check: 2007-10-24) the muscle that extends the forearm and abducts the ulna in pronation of the wrist a thin quadrilateral muscle at the junction of the thoracic and lumbar regions; acts to counteract the pull of the diaphragm on the ribs to which it is attached a muscle that flexes and supinates the forearm icosym-nt.cvut.cz /kifb-test/wordnet/_muscle.html   (1014 words)

eMedicine - Extraocular Muscles, Anatomy : Article by Robert H Graham, MD The upper division of the oculomotor nerve (cranial nerve III) innervates the superior rectus and the levator palpebrae superioris muscles. The nerve to the inferior oblique muscle enters the muscle laterally at the junction of the inferior oblique and inferior rectus muscles. The tendon of the medial rectus muscle inserts 5.5 mm posterior to the limbus along the medial aspect of the globe. emedicine.com /oph/topic15.htm   (1526 words)

Yale- Cranial Nerve 6, pg. 5 For eye movements in the horizontal plane, the lateral rectus muscle of one eye and the medial rectus muscle of the other eye must work precisely together. The abducens nucleus sends signals via CN VI to the lateral rectus muscle of the ipsilateral orbit to command that eye to be abducted. Simultaneously, the occulomotor nucleus generates a command via CN III to contract the medial rectus muscle of the contralateral orbit resulting in adduction of that eye. info.med.yale.edu /caim/cnerves/cn6/cn6_5.html   (191 words)

COS - Welcome to the Canadian Journal of Ophthalmology   (Site not responding. Last check: 2007-10-24) Abduction saccades and a forced muscle generation test confirmed the presence of complete unrecovered sixth nerve palsy, and forced duction testing measured the degree of medial rectus contracture. All patients received ipsilateral medial rectus injection of botulinum toxin in the preoperative (8 to 2 months before surgery) and perioperative periods, and underwent complete superior rectus–inferior rectus transposition temporally. Temporal transposition of the vertical rectus muscles combined with perioperative botulinum toxin injection of the ipsilateral medial rectus muscle is a reliable and effective way of restoring functional binocular vision in patients with complete unrecovered sixth nerve palsy. www.eyesite.ca /english/program-and-services/cjo/vol36/no1/abs2.htm   (390 words)

Ophthalmology Review: Vertical Rectus Muscle Transposition for Bilateral Duane Syndrome Augmented transposition of the superior and inferior rectus muscles to the lateral rectus muscle is effective surgical treatment for esotropia in unilateral Duane syndrome. Medial rectus muscle recession in bilateral Duane syndrome may increase the risk of consecutive exotropia and cause limitation to adduction postoperatively. Vertical rectus muscle transposition may be useful in bilateral Duane syndrome with esotropia.We undertook a retrospective review of 11 patients with bilateral Duane syndrome and esotropia in primary position. www.noorvision.com /weblog/archives/2005/12/vertical_rectus.html   (141 words)

Al Disinsertion or damage to the rectus muscle during pterygium excision is one of the major complications. During pterygium excision care should be taken not to cut the insertion of the rectus muscle or leave it exposed. Inadvertent disinsertion of the medial rectus muscle has been reported particularly with resection of large or recurrent pterygia. www.alshifa-eye.org.pk /journal/rectus.html   (1009 words)

The Brain Stem and Cerebellum The medial lemnisci are medially situated in the medulla, but in the pons they become horizontally oriented and by the midbrain they are situated laterally, near the spinothalamic tracts. One can demonstrate that this weakness is not caused by medial rectus paralysis, because this muscle functions normally during convergeance (which is coordinated entirely in the midbrain). The critical structures involved are the descending corticospinal and corticobulbar fibers in the cerebral peduncle, and the fibers of the third nerve that traverse the peduncle on exiting the midbrain. medinfo.ufl.edu /year2/neuro/review/bsc.html   (1520 words)

medial rectus muscle (anatomy) - General Practice Notebook   (Site not responding. Last check: 2007-10-24) Medial rectus is one of the muscles of the orbit. It arises from the medial side of the common tendinous ring at the back of the orbit. It passes anteriorly to insert into the sclera of the eye anterior to the equator of the globe but posterior to the sclerocorneal junction. www.gpnotebook.co.uk /cache/-1476001712.htm   (139 words)

gms | | Medial rectus muscle tendon elongation for correction of large convergent squint angles after three wall ... Medial rectus muscle tendon elongation for correction of large convergent squint angles after three wall orbital decompression in thyroid-associated ophthalmopathy with compressive optic neuropathy Resection of the lateral rectus muscle is not recommendable, because the medial rectus muscles are trapped in the ethmoid cells. The dose effect coefficient (improvement of the squint angle [°]/amount of recession (R) of the muscle [mm]) was lower for the tendon elongation (1.1°/mm R) in comparison to a bilateral medial rectus recession (1.58°/mm R) in patients without prior orbital decompression. www.egms.de /en/meetings/dog2004/04dog254.shtml   (436 words)

Evidence for Rectus Extraocular Muscle Pulleys in Rodents -- Khanna and Porter 42 (9): 1986 -- Investigative ... the rectus muscle bellies are stabilized relative to the orbit medially at approximately 3 mm posterior to the medial rectus pulley and from the medial rectus to the inferior rectus pulley, www.iovs.org /cgi/content/full/42/9/1986   (4196 words)

Class I Duane syndrome, left eye It is possible that abnormal inferior direction of the lateral rectus (LR) is causing the hypotropia and the "downshoot" of the left eye in abduction. The need for weakening the medial rectus of the involved eye, either at the first surgery or later if it limits forced abduction after transfer, is agreed upon. Full tendon transfer shifting the vertical recti to the lateral rectus is preferred by one expert who also directs attention to the position of a possibly offending lateral rectus in the involved eye. telemedicine.orbis.org /bins/volume_page.asp?cid=2-64-93-1514   (775 words)

Rectus Extraocular Muscle Paths and Decompression Surgery for Graves Orbitopathy: Mechanism of Motility Disturbances -- ... Determination of rectus muscle path centroids and displacement of orbital center and muscle paths in normalized MRI scan perpendicular to the orbital axis approximately 3 mm before the globe–optic nerve junction. Muscle paths were determined in primary position using the described method. that the centrifugal displacement of the medial rectus muscle is www.iovs.org /cgi/content/full/43/2/300   (5872 words)

The Atheist Myrmidon » A Marvel of Evolution & Human Anatomy   (Site not responding. Last check: 2007-10-24) Four muscles (the four rectus muscles) are located at the 12, 3, 6, and 9 o’clock positions on the eye. If the medial rectus muscle contracts (moving the eye medially, to look towards your nose), the superior and inferior rectus muscles (12 and 6 o’clock) are poorly effective, or ineffective, at elevating or depressing the eye. Since the eye can no longer be depressed by the inferior rectus muscle, the superior oblique muscle is required, and this is where the importance of the trochlea enters. www.aychamo.com /?p=34   (781 words)

Eye Theory The lateral rectus muscles abduct the eye (away from the nose) and the medial rectus muscles adduct the eye (towards the nose). All four of the muscles contribute a percentage of the vertical motion depending on the position of the eye. Cranial nerve III innervate four muscles (medial rectus muscle, superior rectus muscle, inferior rectus muscle, and inferior oblique muscle). cim.ucdavis.edu /Eyes/eyeText.htm   (501 words)

Liposarcoma of the orbit presenting as an enlarged medial rectus muscle on CT scan -- Monteiro 86 (12): 1450 -- British ... Liposarcoma of the orbit presenting as an enlarged medial rectus muscle on CT scan -- Monteiro 86 (12): 1450 -- British Journal of Ophthalmology Liposarcoma of the orbit presenting as an enlarged medial rectus muscle on CT scan with a tumour restricted to the medial rectus muscle with a bjo.bmjjournals.com /cgi/content/full/86/12/1450   (591 words)

JEFF MANN’S EM GUIDEMAPS — DIPLOPLIA (* lateral rectus muscle weakness usually produces diplopia that is worse on distant gaze, while weakness of the obliques and medial rectus muscle produce diplopia that is worse during adduction and near-vision) When a patient looks in a particular direction of gaze, the extra-ocular muscles moving the two eyes are yoked together so that the two eyes move equally in the direction of conjugate gaze eg. when looking horizontally to the right, the right lateral rectus muscle and the left medial rectus receive an equal degree of innervation, so that they move the left and right eye equally in the direction of right lateral gaze - the muscle pairs are yoked together in conjugate gaze. www.jeffmann.net /NeuroGuidemaps/diploplia.html   (5408 words)

Orthoptics - Post-operative 'slipped' medial rectus muscle Eleven cases with slipped medial rectus after prior surgery and confirmation by the tendon step test are described. Presentation of slipped muscle may include unexpected over- or under-correction in the early post-op period, limited duction, widening of the palpebral fissure on attempted movement into the field of action of the affected muscle, proptosis, and abnormal head posture. In each of these cases the empty capsule was excised and the slipped muscle advanced and re-attached to the sclera. orthopticsnwest.org.uk /orthoptics-abstracts/orthoptics-abstract47.php   (201 words)

medial longitudinal fasciculus - multiple sclerosis encyclopaedia   (Site not responding. Last check: 2007-10-24) It is due to a lesion in the medial longitudinal fasciculus (MLF) which connects the sixth nerve nuclei to the contralateral medial rectus muscle nucleus. In unilateral case, there is loss of adduction of the contralateral medial rectus on attempted conjugate gaze. Convergence is usually not affected in lesion of the medial longitudinal fasciculus (MLF) alone. home.btconnect.com /mult-sclerosis/mediallongitudinalfasciculus.html   (277 words)

Medical Dictionary: Medial rectus muscle - WrongDiagnosis.com - WrongDiagnosis.com Medial rectus muscle: the ocular muscle whose contraction turns the eyeball medially Terms that may be interchangeable with Medial rectus muscle: A hierarchical classification of Medial rectus muscle: The following list attempts to classify Medial rectus muscle into categories where each line is subset of the next. www.wrongdiagnosis.com /medical/medial_rectus_muscle_printer.htm   (161 words)

Review of Ophthalmology As long as the removal of the excess fold of skin and suturing the two skin edges is documented in the operative report, the ASC is entitled to the larger reimbursement rate. Indications: This is a 43-year-old man with a history of right esotropia and strabismus surgery at a very young age (medial rectus recession) and dense amblyopia of the right eye. The suture needles were then brought back forward through the original muscle insertion in a crossed sword fashion and then tied together using a cinch knot. www.revophth.com /index.asp?page=1_382.htm   (1011 words)

A simplified approach to the treatment of Duane's syndrome -- Barbe et al. 88 (1): 131 -- British Journal of ... muscle recession was achieved in 93% of patients. or lateral rectus muscle recession as the surgical procedure. Vertical rectus muscle augmented transposition in Duane syndrome. bjo.bmjjournals.com /cgi/content/full/88/1/131   (2314 words)

Missing Lateral Rectus Force and Absence of Medial Rectus Co-Contraction in Ocular Convergence -- Miller et al. 87 (5): ... the muscle, 2 or 3 mm posterior to the insertion. Convergence force, the increase in muscle force when fixating near compared with far targets is plotted as a function of near minus far misalignment of the instrumented eye. Medial rectus convergence forces were negative for all eye positions tested (Fig. jn.physiology.org /cgi/content/full/87/5/2421   (8251 words)

uhrad.com - Neuroradiology Imaging Teaching Files   (Site not responding. Last check: 2007-10-24) In addition, there is abnormal soft tissue extending post septally along the lamina papyracea, causing displacement of the medial rectus laterally. In addition, the left medial rectus muscle is asymmetrically enlarged suggesting associated edema. On the other hand, post septal cellulitis commonly demonstrates swelling of the extra-occular muscles, as well as displacement of extraconal fat and rectus muscle away from the orbital wall. www.uhrad.com /mriarc/mri054.htm   (263 words)

CancerLIT: 710265 We describe 2 patients whose medial rectus myectomies were repaired by using nonabsorbable "hang-back" sutures in combination with a botulinum toxin (Botox) injection of the antagonist lateral rectus muscle. The vascularised abdominal muscle flap for skull base reconstruction was fixed with fibrin glue, but was not adequate to fill the dead space, resulting in cerebrospinal fluid leakage and subsequent meningitis. Based on these earlier experiences, we used a ROC fastener system to completely fill the dead space with an abdominal muscle flap, and bone flap was primarily craniectomised in the four most recent cases. cancerweb.ncl.ac.uk /cancernet/cancerlit/710265.html   (5623 words)

Case 16: Ptosis and Diabetes   (Site not responding. Last check: 2007-10-24) A computed tomogram (CT) scan of the sinuses and orbits was notable for fluid in both ethmoid sinuses and inflammatory changes to the left medial rectus muscle. CancerNet from the National Cancer Institute, "Computed tomography is a diagnostic procedure in which cross-sectional pictures or "tomographic slices" of the body are made by x-ray. Medial rectus muscle: from top to bottom, this muscle is in the middle, and it is the one on the inside of the area between the eyes. alumni.imsa.edu /~vader21/homework-patho-case16-III.html   (141 words)

[No title] Recession of medial rectus muscle and resection of lateral rectus muscle Bilateral recession of medial recti muscle of eye Bilateral recession of lateral recti muscle of eye www.treatsmart.co.uk /Eye1.htm   (43 words)

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