نتایج جستجو برای: oculomotor muscles
تعداد نتایج: 59974 فیلتر نتایج به سال:
A study was made of the eye muscles activated by faradic stimulation of the frontal cortex, midbrain tegmentum, and oculomotor nerve of the macaque. The traditional view concerning the actions of the individual muscles was not confirmed. The vertical recti were found to be effective elevators and depressors of the eyes regardless of the position of the eye in the horizontal plane. At the brain ...
Saccades are the eye movements we make to look at objects. Apart from being astonishingly fast, often lasting little more than 20 milliseconds, they also happen to be the single most frequent movement we make, much commoner than heartbeats: we make two or three saccades every second of our waking lives. Saccades determine what we see, so their importance can hardly be exaggerated. The neural sy...
PURPOSE Insulin-like growth factor 1 (IGF1) and cardiotrophin 1 (CT1) are known to increase the strength of extraocular muscles in adult and embryonic animals, but no information is available for the early postnatal period, when strabismus treatment in humans is most urgent. Here the authors sought to determine whether these trophic factors strengthen juvenile maturing extraocular muscles and g...
Activity of vestibular nucleus neurons with axons in the ipsi- or contralateral medial vestibulospinal tract was studied in decerebrate cats during sinusoidal, whole-body rotations in many planes in three-dimensional space. Antidromic activation of axon collaterals distinguished between neurons projecting only to neck segments from those with collaterals to C6 and/or oculomotor nucleus. Seconda...
background: ataxia with oculomotor apraxia type 1 (aoa1) shows early onset with autosomal recessive inheritance and is caused by a mutation in the aprataxin (aptx) gene encoding for the aptx protein. methods: in this study, a 7-year-old girl born of a first-cousin consanguineous marriage was described with early-onset progressive ataxia and aoa, with increased cholesterol concentration and decr...
PURPOSE To identify the causative mutation with its possible origin in a Chinese family with congenital fibrosis of extraocular muscles type 1 (CFEOM1) and to characterize the ocular phenotypes and lesions in the corresponding intracranial nerves. METHODS Three affected siblings and their asymptomatic parents underwent comprehensive ophthalmic examinations and neuropathologic analysis involvi...
PURPOSE To analyze innervated myotendinous cylinders (IMCs) in the extraocular muscles (EOMs) of normal subjects and strabismic patients. METHODS The rectus muscles of 37 subjects were analyzed. Distal myotendinous specimens were obtained from 3 normal subjects, 20 patients with acquired strabismus, 11 with infantile strabismus, and from 3 with congenital nystagmus, and were studied by using ...
Five visual search experiments found oculomotor and attentional capture consistent with predictions of contingent orienting, contrary to claims that oculomotor capture is purely stimulus driven. Separate saccade and attend-only conditions contained a color target appearing either singly, with an onset or color distractor, or both. In singleton mode, onsets produced oculomotor and attentional ca...
Oculomotor palsy with cyclic spasms is an extremely rare condition whose exact pathophysiology remains a mystery. We followed boy from the onset of symptoms at age ten months until 15 years and documented case video oculography. In addition, he was diagnosed hereditary motor sensory neuropathy (Charcot-Marie-Tooth disease type 1). Although pure coincidence cannot be ruled out, it conceivable th...
balint’s syndrome is a rare neurological disorder associated with bilateral parieto-occipital damage which was described by rezsö bálint in 1909.the syndrome is manifested clinically by the presence of a hemispatial negligence. the lesion is usually inside parietooccipital region bilaterally in most cases but may also be compromised angular convolutions, the dorsolateral area of the occipital l...
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