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Abducens Nerve   (Site not responding. Last check: 2007-10-11) The abducens nerve passes through the common tendonous ring of the four rectus muscles and then enters the deep surface of the lateral rectus muscle. The function of the abducens nerve is to contract the lateral rectus which results in abduction of the eye. The abducens nerve in humans is solely and somatomotor nerve. www.meddean.luc.edu /lumen/MedEd/GrossAnatomy/h_n/cn/cn1/cn6.htm   (146 words)

AllRefer Health - Cranial Mononeuropathy VI (Abducens Palsy, Lateral Rectus Palsy) Cranial mononeuropathy VI is a disorder that causes double vision, associated with dysfunction of cranial nerve VI, which is responsible for moving the eye to the side. Cranial mononeuropathy VI is a mononeuropathy (damage to a single nerve) involving the sixth cranial (abducens) nerve, one of the cranial nerves that controls eye movement. Abducens nerve disorders are often associated with diabetic neuropathy, trauma, infections (like meningitis or sinusitis), infarction (tissue damage from loss of blood flow), cranial aneurysms, tumors, or increased intracranial pressure (pressure within the skull). health.allrefer.com /health/cranial-mononeuropathy-vi-info.html   (356 words)

s000510a - Sixth (Abducens) Nerve Palsy: Differential Diagnosis Abducens palsy was present in 68%, glossopharyngeal in: 28%, hypoglossal in 26%, and oculomotor in 20%. The nature of tumor, the presence of brain stem: distortion, the anatomic variation of posterior fossa, and the relationships of cranial nerves and nearby blood vessels,: which are factors influencing the occurrence of false localizing, are briefly discussed. Thin-slice MR images showed the abducens nerves in the subarachnoid space: and clearly showed compressive lesions of the nerves by a brain tumor in both cases. www.emory.edu /WHSCL/grady/amreport/litsrch99/s000510a.html   (4242 words)

Abducens nerve   (Site not responding. Last check: 2007-10-11) The sixth out of twelve cranial nerves, the abducens nerve controls the lateral rectus muscle - this means that the action of this nerve controls each eye's ability to look laterally (away from the midline). The abducens nerve emerges from the brainstem between the pons and the medulla, and exits the skull through the superior orbital fissure (one of the holes in the skull behind the eye). As the abducens emerges near the bottom of the brain, it is often the first nerve compressed when there is any rise in intracranial pressure. publicliterature.org /en/wikipedia/a/ab/abducens_nerve.html   (121 words)

Recruitment Order of Cat Abducens Motoneurons and Internuclear Neurons -- Pastor and González-Forero 90 (4): ... (in spikes/s/°/s) for 55 abducens motoneurons and 33 internuclear neurons. Physiological identification of interneurons and motoneurons in the abducens nucleus. Reversible deafferentation of abducens motoneurons and internuclear neurons with tetanus neurotoxin. jn.physiology.org /cgi/content/full/90/4/2240   (6631 words)

Abducens nerve - Wikipedia, the free encyclopedia The abducens nerve (the sixth cranial nerve, also called the sixth nerve or simply VI) is a motor nerve (a “somatic efferent” nerve) that controls the movement of a single muscle, the lateral rectus muscle of the eye. The abducens nerve leaves the brainstem at the junction of the pons and the medulla, medial to the facial nerve. The abducens nucleus is located in the pons, on the floor of the fourth ventricle, at the level of the facial colliculus. en.wikipedia.org /wiki/Abducens_nerve   (1337 words)

Dorello´s canal: a microanatomical study The abducens nerve was identified at the point where it crossed the lateral wall of the artery and was followed backward toward Dorello's canal. Inside Dorello's canal the abducens nerve was tightly attached to the endosteal dura of the petrous apex and to Gruber's ligament by connective tissue intimately related to the dural sheath surrounding the nerve in ibis reglOn. He found that inside the canal the abducens nerve was in a lateral position, the meningeal artery was in a medial position, and the inferior petrosal sinus usually overlay the nerve. www.medicosecuador.com /espanol/articulos_medicos/48.htm   (2842 words)

Yale- Cranial Nerve 6, pg. 1 See the CN III section (occulomotor nerve) for a discussion of eye movements and the interaction between the three nuclei and nerves that innervate the extraocular muscles. The abducens nerve innervates the lateral rectus muscle of the ipsilateral orbit. The lateral rectus muscle is responsible for lateral gaze (its contraction causes the eye to be abducted): info.med.yale.edu /caim/cnerves/cn6/cn6_1.html   (103 words)

[Frontiers in Bioscience 2, d552-577, November 15, 1997]   (Site not responding. Last check: 2007-10-11) The discharge of primate abducens motoneurons at primary position (36-108 spikes/s; column 5, table 5) is higher than that of NPH cells in the same species (47-57 spikes/s; column 5, table 2) as well as that of abducens motoneurons in the cat (about 23 spikes/s on the average; ref. 101). Field potentials recorded in the abducens nucleus and triggered by spikes of position-velocity cells of the ipsilateral (contralateral) NPH nucleus are consistent with a small distal excitatory (inhibitory) connection (120). Moreover, an inhibitory projection of NPH cells to the contralateral abducens nucleus is supported by the fact that injection of tritiated glycine (a putative inhibitory neurotransmitter that is taken up by the terminals which release it) is transported to the cell bodies they originate from in the contralateral NPH (121). www.bioscience.org /1997/v2/d/moschov/5.htm   (6211 words)

Abducens nucleus - Wikipedia, the free encyclopedia The abducens nucleus is the originating nucleus from which the abducens nerve emerges - a cranial nerve nucleus. The abducens nucleus along with the internal genu of the facial nerve make up the facial colliculus, a hump at the caudal end of the medial eminence on the dorsal aspect of the pons. Damage to the abducens nucleus causes monocular medial ophthalmoparesis: specifically, loss of the ability to move the ipsilateral eye outward (abduction). en.wikipedia.org /wiki/Abducens_nucleus   (328 words)

Cranial mononeuropathy VI Cranial mononeuropathy VI is a disorder that causes double vision, associated with dysfunction of cranial nerve VI, which is responsible for moving the eye to the side. Cranial mononeuropathy VI is a mononeuropathy (damage to a single nerve) involving the sixth cranial (abducens) nerve, one of the cranial nerves that controls eye movement. Abducens nerve disorders are often associated with diabetic neuropathy, trauma, infections (like meningitis or sinusitis), infarction (tissue damage from loss of blood flow), cranial aneurysms, tumors, or increased intracranial pressure (pressure within the skull). www.mercydesmoines.org /ADAM/Encyclopedia/ency/000690.asp   (244 words)

APStracts 2:0215N, 1995.   (Site not responding. Last check: 2007-10-11) Abducens neurons showed transient excitation after a current pulse was applied to the contralateral labyrinth and transient inhibition after stimulation of the ipsilateral labyrinth. In two of three monkeys, the excitatory responses of abducens neurons to electrical stimulation of the contralateral labyrinth were approximately three times as large as their inhibitory responses to stimulation of the ipsilateral labyrinth. The asymmetry in the size of the electrically evoked inputs from the two labyrinths was associated with a smaller asymmetry in responses of abducens neurons during the VOR evoked by passive head turns. www.uth.tmc.edu /apstracts/1995/jn/August/215n.html   (454 words)

Journal of Pediatric Ophthalmology and Strabismus - Magnetic Resonance Imaging in Duane’s Retraction Syndrome Huseyin Ozkurt, MD; M. Basak, MD; Y. Oral, MD; Y. kur, MD The aim of this study was to visualize the subarachnoid portion of the nervus abducens by magnetic resonance imaging and to analyze whether aplasia of the nervus abducens is an etiologic factor in Duane’s retraction syndrome. The nervus abducens on the affected side could not be observed in 6 (54.5%) of 11 eyes (8 cases) that were clinically diagnosed as having Duane’s retraction syndrome. The nervus abducens was observed in 15 (94%) of 16 eyes that were screened as the control group. www.journalofpediatricophthalmology.com /showAbst.asp?thing=4854   (219 words)

[No title] Abducens neurons project rostrally through the MLF to synapse on trochlear and oculomotor neurons. Right abducens nerve palsy: all of the brain stem circuitry is intact, but the abducens nerve is lesioned. Abducens interneurons also project across the midline to the oculomotor nuclei to excite the left medial rectus and to inhibit the contralateral (right) medial rectus. cpmcnet.columbia.edu /dept/ps/2004/Academic/first_year/neuro/ns21.doc   (2273 words)

An Isolated Abducens Nerve Palsy Disclosing Pachymeningitis Secondary To Sphenoid Sinusitis   (Site not responding. Last check: 2007-10-11) Among myriad of causes of abducens nerve palsy (Table 1), sinusitis as a cause of isolated abducens palsy is rarely thought of especially in absence of associated symptoms as in this case. The internal carotid artery and sixth cranial nerve are within the cavernous sinus itself, closer to the sphenoid sinus, while abducen nerve lies lateral to the internal carotid artery and medial to the ophthalmic division of the trigeminal nerve, in close proximity to the oculomotor and trochlear nerves. The abducens nerve passes almost vertically in front of the clivus where it may be damaged by enlarged ectatic basilar artery or by tumors such as chordoma menenigioma or nasopharyngeal carcinoma www.ispub.com /ostia/index.php?xmlFilePath=journals/ijorl/vol3n2/abducens.xml   (1290 words)

Abducens VI, Facials VII, Brain Sections / Schematics - Datasets, Project TOUCH - Health Sciences Center, UNM   (Site not responding. Last check: 2007-10-11) From the large pale-staining abducens nuclei in the floor of the fourth ventricle, fibers of each abducens nerve (VI) course ventromedially through the tegmentum, emerging at the pontomedullary junction. Ventrolateral to the abducens nuclei lie the darkly-stained fibers of the facial nerve (VII). They arise from the facial motor nuclei, travel dorsomedially to loop over the abducens nuclei (as the internal genu of the facial nerve), then pass ventrolaterally to emerge from the brainstem between the abducens (VI) and vestibulocochlear (VIII) nerves at the junction of the pons with the medulla (caudal to this section). hsc.unm.edu /touch/datasets/datasets/19/index.shtml   (201 words)

Abducens Nerves (VI)   (Site not responding. Last check: 2007-10-11) The "abducens nerves" are the sixth pair of cranial nerves; thus, the number "VI". These nerves are quite small and stem from the pons (at the base of the brain). They enter the orbits of the eyes and supply motor impulses to a pair of external eye muscles, called the "lateral rectus" muscles. www.innerbody.com /text/nerv31.html   (53 words)

Expression of the immediate-early gene-encoded protein Egr-1 (zif268) during in vitro classical conditioning -- Mokin ... (A) An exemplar abducens nerve recording showing a short latency burst discharge (arrow; the onset of the CS is indicated by the arrowhead) that characterizes CRs of brain stem preparations followed by a UR (the stimulus is indicated by the filled circle). Anderson, C.W. and Keifer, J. The cerebellum and red nucleus are not required for in vitro classical conditioning of the turtle abducens nerve response. Properties of conditioned abducens nerve responses in a highly reduced in vitro brain stem preparation from the turtle. www.learnmem.org /cgi/content/full/12/2/144   (5014 words)

Usefulness of MR Imaging in Children without Characteristic Clinical Findings of Duane's Retraction Syndrome -- Kim and ... focused on the presence or absence of the abducens nerve. B–D, Right and left abducens nerves are not identified on the three axial MR images obtained from the pontomedullary junction to the lower pons. of the abducens nerve, and the abducens nerve on the affected www.ajnr.org /cgi/content/full/26/4/702   (1502 words)

BS 13. Vestibular Nuclei and Abducens Nucleus - Overview to the cells in abducens nucleus), and in particular to cells innervating the medial rectus muscle. These are the circuits that underlie horizontal movement of BOTH eyes in the direction opposite to the rotating head movement. Lesion in the abducens nucleus results in the inability to turn both eyes IPSI. www.neuroanatomy.wisc.edu /Bs97/TEXT/P13/ov.htm   (471 words)

Paulo César Mendes MD - English to Portuguese translator. Translation services in Medical (general) ... A nuclear lesion has different consequences, because the abducens nucleus contain interneurons that project via the longitudinal fasciculus to the medial rectus subnucleus of the contralateral oculomotor complex. Therefore, an abducens nuclear lesion produces a complete lateral gaze palsy, from weakness of both the ipsilateral lateral rectus and the contralateral medial rectus. After leaving the ventral pons, the abducens nerve runs forward along the clivus to pierce the dura at the petrous apex, where it enters the cavernous sinus. www.proz.com /pro/15543   (796 words)

Discharge Profiles of Abducens, Accessory Abducens, and Orbicularis Oculi Motoneurons During Reflex and Conditioned ... A-C: antidromic identification of abducens (A, Abd Mn), accessory abducens (B, Acc Abd Mn), and orbicularis oculi (C, OO Mn) motoneurons in the alert behaving cat. Although lid movements and the EMG activity of the orbicularis oculi muscle are not the direct result of the firing rate of abducens and accessory abducens motoneurons, the average is illustrated for comparison with results obtained for the orbicularis oculi motoneuron. Activity of 12 representative abducens (n = 4), accessory abducens (n = 4), and orbicularis oculi (n = 4) motoneurons during 2 different (trace and delayed) classical conditioning paradigms recorded during the 6th conditioning session in 2 different animals. jn.physiology.org /cgi/content/full/81/4/1666   (9281 words)

New Medical Subject Headings Diseases of the sixth cranial (abducens) nerve or its nucleus in the pons. The nerve may be injured along its course in the pons, intracranially as it travels along the base of the brain, in the cavernous sinus, or at the level of superior orbital fissure or orbit. Traumatic injury to the abducens, or sixth, cranial nerve. www.nlm.nih.gov /mesh/newh2000.html   (5823 words)

BS 13. Vestibular Nuclei and Abducens Nucleus - Eyes The PPRF, which lies within the medial portion of the pontine tegmentum, ventral to the abducens nucleus, is an integrative region involved in the generation of horizontal eye movements. The abducens nucleus lies just off the midline within the dorsal part of the pons, just under the fourth ventricle. The larger motor neurons in this nucleus possess axons that pass ventrally through the pons to exit on the ventral surface of the brain stem (at the pontomedullary junction). www.neuroanatomy.wisc.edu /Bs97/TEXT/P13/eyes.htm   (631 words)

abducens nerve - OmniMedicalSearch.com - abducens nerve   (Site not responding. Last check: 2007-10-11) A sixth nerve palsy, also known as abducens nerve palsy, is a neurological defect resulting from an impaired sixth nerve or the nucleus that controls it. For all intensive purposes causes of abducens nerve Medical information changes rapidly and while OmniMedicalSearch.com and its content providers make efforts to update the content on the site, some information may be out of date and therefore the information should not be used to diagnose, treat, cure or prevent any disease without the supervision of a medical doctor. www.omnimedicalsearch.com /sr_abducens_nerve.html   (548 words)

eMedicine - Abducens Nerve Palsy : Article Excerpt by: Michael P Ehrenhaus, MD   (Site not responding. Last check: 2007-10-11) Background: Cranial nerve VI, also known as the abducens nerve, innervates the ipsilateral lateral rectus (LR), which functions to abduct the ipsilateral eye. It has the longest subarachnoid course of all the cranial nerves; therefore, its syndromes are similar to those of the fourth nerve because of their long intracranial courses. Central nervous system lesions of the abducens nerve tract are localized easily secondary to the typical findings associated with each kind of lesion. www.emedicine.com /oph/byname/abducens-nerve-palsy.htm   (721 words)

The Cerebellum and Red Nucleus Are Not Required for In Vitro Classical Conditioning of the Turtle Abducens Nerve ... A CR was defined as a neuronal discharge recorded in the abducens nerve that occurred during the conditioning Anderson CW, Keifer J (1997) The cerebellum and red nucleus are not required for in vitro classical conditioning of the turtle abducens nerve response. Keifer J, Armstrong KE, Houk JC (1995) In vitro classical conditioning of abducens nerve discharge in turtles. www.jneurosci.org /cgi/content/full/17/24/9736   (6612 words)

eMedicine - Abducens Nerve Palsy : Article by Michael P Ehrenhaus, MD   (Site not responding. Last check: 2007-10-11) Abducens palsy frequently is seen as a postviral syndrome in younger patients and as an ischemic mononeuropathy in the adult population. This is believed to be the reason that about 30% of patients with pseudotumor cerebri have an isolated abducens palsy. Calisaneller T, Ozdemir O, Altinors N: Posttraumatic acute bilateral abducens nerve palsy in a child. www.emedicine.com /oph/topic158.htm   (1604 words)

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