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Each side of the forebrain represents the opposite side of the body
of the body, and the right side of the brain primarily represents the left side of the body. The contralateral organization involves both executive and
Contralateral_brain
Specialization of some cognitive functions in one side of the brain
pain, and temperature are primarily processed in the contralateral somatosensory cortex of the brain. Mechanoreceptors responsible for touch and vibration
Lateralization of brain function
Lateralization_of_brain_function
Scientific theory in vertebrate development
specific aspects, most of which explain contralateral forebrain organization, the phenomenon that the left side of the brain mainly controls the right side of
Axial_twist_theory
Potentially deadly side effect of very high pressure within the skull
the ipsilateral primary visual cortex and contralateral visual field deficits in both eyes (contralateral homonymous hemianopsia). Another important
Brain_herniation
Condition of the human brain
verbally name what they have seen. This is because the brain's experiences of the senses is contralateral. Communication between the two hemispheres is inhibited
Split-brain
Central organ of the human nervous system
has a contralateral organisation with each hemisphere of the brain interacting primarily with one half of the body: the left side of the brain interacts
Human_brain
Neurosurgical treatment
Deep brain stimulation (DBS) is a type of neurostimulation therapy in which an implantable pulse generator is surgically implanted below the skin of the
Deep_brain_stimulation
Bleeding within the skull
epidural hematoma is large enough, it will cause mass effect on contralateral brain which lead to midline, subfalcine (below the falx cerebri), and trans-tentorial
Intracranial_hemorrhage
Weakness of one entire side of the body
an old contralateral brain injury subsequently experienced worsening of their hemiparesis when hit with a second stroke in the ipsilateral brain. The authors
Hemiparesis
Left and right cerebral hemispheres of the brain
functions, the low-level representations also tend to represent the contralateral side of the body.[citation needed] The best example of an established
Cerebral_hemisphere
Asymmetrically-impaired spatial awareness due to a brain hemisphere being damaged
represented in the brain. In this theory, it is believed that the underlying cause of neglect is the inability to form contralateral representations of
Hemispatial_neglect
Biological term to describe a crossing
by 180° with respect to the rest of the body. Chiasm Commissure Contralateral brain Definition of types of crossings Fissure (anatomy) Palpebral commissure
Decussation
Type of intracranial bleeding that occurs within the brain tissue itself
coma and death. Hemorrhage into the basal ganglia or thalamus causes contralateral hemiplegia due to damage to the internal capsule. Other possible symptoms
Intracerebral_hemorrhage
Oxygen shortage of the brain
strokes present with the same symptoms such as contralateral paralysis (opposite side of body from affected brain hemisphere), or sudden weakness or numbness
Cerebral_hypoxia
Part of the brain where the optic nerves cross
Chiasmal syndrome Chiasm (anatomy) Definition of types of crossings Contralateral brain Colman, Andrew M. (2006). Oxford Dictionary of Psychology (2nd ed
Optic_chiasm
Bleeding within parenchymal tissue of the brain
apraxia Caudate nucleus - Contralateral hemiparesis, contralateral conjugate gaze paresis, or confusion Brain stem - Tetraparesis, facial weakness, decreased
Intraparenchymal_hemorrhage
Ability of the brain to continuously change
medium of neural networks in the brain to change through growth and reorganization. Neuroplasticity refers to the brain's ability to reorganize and rewire
Neuroplasticity
Nerve crossings outside the central nervous system
move the contralateral eye (i.e., the superior oblique muscle). It emerges from the dorsal aspect of the ventral midbrain, leaves the brain on the dorsal
Chiasm_(anatomy)
Medical condition
of intracranial tumour. Brain 27:490-508, 1904. J. W. Kernohan JW, Woltman HW. Incisura of the crus due to contralateral brain tumor. Archives of Neurology
Duret_haemorrhages
Term in human neuroanatomy referring to several things
of one hemisphere. For right handed individuals, since the brain operates the contralateral side of the body, they could have a more induced motor cortex
Brain_asymmetry
Medical condition
Pupil dilated and fixed. Contralateral hemiplegia CT scan or MRI might help in delineating the cause or the vessel or region of brain involved in stroke.[citation
Weber's_syndrome
Neuron cluster in the brainstem
aspect mainly receive contralateral inputs (i.e. from the opposite side of the cortex). The result is that both sides of the brain control the muscles of
Facial_motor_nucleus
Brain injury symptom
PMID 1763762. Kernohan, J; Woltman H (1929). "Incisura of the crus due to contralateral brain tumour". Arch Neurol Psychiatry. 21 (2): 274–287. doi:10.1001/archneurpsyc
Kernohan's_notch
Large part of the brain containing the cerebral cortex
two cerebral hemispheres, the right and the left. The cerebrum is contralaterally organized, i.e., the right hemisphere controls and processes signals
Cerebrum
Theory that regions of the brain are specialized for functions
different areas in the brain are specialized for different functions. It is opposed to the anti-localizationist theories and brain holism and equipotentialism
Functional specialization (brain)
Functional_specialization_(brain)
Study of animal behavior and its underlying mechanistic control by the nervous system
was shown that the stimulus features ep and et are processed in the contralateral retino-topic maps of the retina: ep preferably in the optic tectum by
Neuroethology
Period of symptoms due to excessive or synchronous neuronal brain activity
adjacent areas, and in some cases, may travel to the opposite hemisphere (contralateral spread). Despite this potential for spread, the initial focus remains
Seizure
Brain structure
arrangement of ipsilateral and contralateral afferent inputs and outputs: Dissection of brain-stem. Lateral view. Deep dissection of brain-stem. Lateral view. Deep
Lateral_lemniscus
Medical condition
(usually the right brain) Visual disorders: déviation conjuguée, a gaze preference towards the side of the lesion; contralateral homonymous hemianopsia
Middle cerebral artery syndrome
Middle_cerebral_artery_syndrome
Neuropsychiatric disorder
the medial aspect of the brain's frontal lobe can trigger reaching, grasping and other purposeful movements in the contralateral hand. With anteromedial
Alien_hand_syndrome
Motor gyrus of the posterior frontal lobe of the brain
the contralateral side of the body (facial palsy, arm or leg monoparesis, hemiparesis) . New research has identified this as the part of the brain that
Precentral_gyrus
Neural pathway in the visual system
is affected. If both divisions on one side of the brain are affected, the result is a contralateral homonymous hemianopsia. The upper division: Projects
Optic_radiation
Asymmetry of the brain hemispheres
torque is related to the aurofacial asymmetry and the contralateral organization of the brain and is due to a not quite complete twist of the anterior
Yakovlevian_torque
Premature fusion of bones in the skull
occurs on the side of the head with the patent coronal suture, the contralateral side. Half of the forehead will bulge forwards. Assessment of the skull
Craniosynostosis
Two cranial nerve nuclei of the human brainstem
however, for stimulation from the contralateral ear via the contralateral CN, and also the somatosensory parts of the brain. There are three major fiber bundles
Cochlear_nucleus
Component of the visual system in the brain's thalamus
information to layers 2, 3 and 5 the eye on the opposite side (the contralateral eye) sends information to layers 1, 4 and 6. This description applies
Lateral_geniculate_nucleus
Electrophysiological method to record electrical activity of the brain
to record an electrogram of the spontaneous electrical activity of the brain. The bio signals detected by EEG have been shown to represent the postsynaptic
Electroencephalography
One of the four lobes of the mammalian brain
memory formation leading to permanent or temporary anterograde amnesia. Contralateral homonymous upper quadrantanopia (sector anopsia) Complex hallucinations
Temporal_lobe
Stroke resulting from lack of blood flow
are affected. If the infarct is located in the primary motor cortex, contralateral hemiparesis is said to occur. With brainstem localization, brainstem
Cerebral_infarction
Surgical removal of one hemisphere of the brain
that is performed by a neurosurgeon where an unhealthy hemisphere of the brain is disconnected or removed. There are two types: Functional hemispherectomy
Hemispherectomy
Austrian-born pediatric neurologist and cognitive neuroscientist
multiple areas of cognitive neuroscience, including brain-behavior relations, contralateral brain organization, consciousness, imitation, laterality among
Marcel_Kinsbourne
Recognition and understanding of another person's pain
firsthand in that study included: contralateral sensorimotor cortex, bilateral secondary sensorimotor cortex, contralateral posterior insula, bilateral mid
Pain_empathy
patterns of brain connectivity. Crossed cerebellar diaschisis is defined by reduced metabolism and blood flow in the cerebellar hemisphere contralateral to a
Diaschisis
Surgical procedure
Unilateral subthalamotomy was associated with significant motor benefit contralateral to the lesion. Further work is needed to ascertain what factors led
Thalamotomy
Structure of the brain stem
crossing over from the ipsilateral side in the spinal cord to the contralateral side in the brain stem; below this is the spinal cord. Blood to the medulla is
Medulla_oblongata
Medical condition
accommodation reflex. Contralateral loss of proprioception and vibration sensations. Cerebellar ataxia: involuntary movements. Deep brain stimulation may provide
Benedikt_syndrome
Ascending bundle of axons which cross in the brainstem
the contralateral side of the brainstem, as the internal arcuate fibres. Stained brain slice images which include the "medial lemniscus" at the BrainMaps
Medial_lemniscus
Medical condition
from both sides of the brain) while the ventral division receives only contralateral input (i.e. from the opposite side of the brain). Thus, lesions of the
Central_facial_palsy
Region of the brain which processes touch
somatosensory cortex only contains a tactile representation of the opposite (contralateral) side of the body. The amount of primary somatosensory cortex devoted
Primary_somatosensory_cortex
Neural pathway within the human visual system
each of which conveys visual information exclusive to its respective contralateral half of the visual field. Each of these tracts is derived from a combination
Optic_tract
Bundle of fibers in the human brain
cerebellothalamic tract that runs from a cerebellar hemisphere to the contralateral thalamus, and the cerebellorubral tract that runs from a cerebellar
Superior_cerebellar_peduncle
Cranial nerve connecting the eye to the brain
cortex in the occipital lobe of the brain. In more specific terms, fibers carrying information from the contralateral superior visual field traverse Meyer's
Optic_nerve
Sleep in which half the brain remains alert
of the brain rests while the other half remains alert. This is in contrast to normal sleep where both eyes are shut and both halves of the brain show unconsciousness
Unihemispheric slow-wave sleep
Unihemispheric_slow-wave_sleep
Neuron group in the brainstem
to the contralateral oculomotor nucleus, where motoneurons drive the contraction of the ipsilateral medial rectus muscle (hence, contralateral to the
Abducens_nucleus
Group of neurological disorders causing seizures
areas, and in some cases, may propagate to the opposite hemisphere (contralateral spread). They are further classified based on the state of consciousness
Epilepsy
Part of the brain at the back of the head
information from the contralateral superior retina representing the inferior visual field. The lingula receives information from the contralateral inferior retina
Occipital_lobe
Outer layer of the cerebrum of the mammalian brain
general, the two hemispheres receive information from the opposite (contralateral) side of the body. For example, the right primary somatosensory cortex
Cerebral_cortex
Midbrain structure involved in the auditory pathway
(containing vertical data) only project to the contralateral inferior colliculus. This inferior colliculus contralateral to the ear it is receiving the most information
Inferior_colliculus
Terminology used to describe the central and peripheral nervous systems
predominantly the contralateral side of the body. A commissure is a bilateral connection of axons connecting the left and right side of the same brain region. For
Anatomical terms of neuroanatomy
Anatomical_terms_of_neuroanatomy
Subset of neurons in certain nuclei
projects to the ipsilateral abducens (cranial nerve VI) nucleus, and contralateral oculomotor (cranial nerve III) nucleus to mediate conjugate horizontal
Paramedian pontine reticular formation
Paramedian_pontine_reticular_formation
Test of the vestibulo-ocular reflex
head turn to the contralateral side. The eyes then turn toward the ipsilateral ear, with horizontal nystagmus to the contralateral ear. Absent reactive
Caloric_reflex_test
Region of the frontal and parietal lobes of the brain
The paracentral lobule controls motor and sensory innervations of the contralateral lower extremity. It is also responsible for control of blushing, defecation
Paracentral_lobule
Neurological disorder
when a hand is stimulated by touch, there is increased brain activity in the contralateral hemisphere, and decreased activity in the ipsilateral hemisphere
Dyschiria
Medical condition
diagnosis. It can cause the following symptoms: Cranial nerve palsy AND contralateral motor/sensory defect Bilateral motor or sensory defect Eye movement
Posterior_circulation_infarct
Technique to study brain metabolism
resonance spectroscopy of the brain (fMRS) uses magnetic resonance imaging (MRI) to study brain metabolism during brain activation. The data generated
Functional magnetic resonance spectroscopy of the brain
Functional_magnetic_resonance_spectroscopy_of_the_brain
Artery which supplies blood to the occipital lobe of the brain
or a single exclusive source. Contralateral loss of pain and temperature sensations. Visual field defects (contralateral hemianopsia with macular sparing)
Posterior_cerebral_artery
Subnucleus of the thalamus in the brain
monaural excitation (usually from the contralateral ear). The ipsilateral neuron is inhibited when contralateral ear is stimulated at the same time There
Medial_geniculate_nucleus
Disorder impairing normal brain function
sign, when there is weakness of hip extension, which normalizes with contralateral hip flexion. Signs of functional tremor include entrainment and distractibility
Functional neurological symptom disorder
Functional_neurological_symptom_disorder
Medical condition
the occlusion of small penetrating arteries that provide blood to the brain's deep structures. Patients who present with symptoms of a lacunar stroke
Lacunar_stroke
Part of the brain responsible for sensory input and some language processing
hemisphere, the somatosensory cortex represents the skin area on the contralateral surface of the body. Immediately posterior to the central sulcus, and
Parietal_lobe
Type of cell within the eye
10–11 in the mouse, they have to make the decision to cross to the contralateral optic tract or remain in the ipsilateral optic tract. In the mouse,
Retinal_ganglion_cell
Structure at the rear of the vertebrate brain, beneath the cerebrum
The cerebellum (pl.: cerebella or cerebellums; Latin for 'little brain') is a major feature of the hindbrain of all vertebrates. Although usually smaller
Cerebellum
Part of the brain's frontal cortex
motor cortex only contains a motor representation of the opposite (contralateral) side of the body. The amount of primary motor cortex devoted to a body
Primary_motor_cortex
Handedness favoring for different tasks
hand for some tasks and the other hand for others, or a hand and the contralateral leg. For example, a cross-dominant person might write with the left
Cross-dominance
Portion of the mammalian cerebral cortex
loss of pain perception and isolated insular infarction can lead to contralateral elimination of pinprick perception. Further, the insula is where a person
Insular_cortex
Blood vessels
hyaline arteriosclerosis secondary to hypertension. This can lead to contralateral paresis (muscular weakness) and/or sensory loss of the face and body
Central_arteries
Involuntary reflexive response due to brain injury
flexor inhibition, defined as a fencing response, while flexion of the contralateral limb is likely mediated by crossed inhibition necessary for pattern
Fencing_response
Region of the cerebral cortex involved in voluntary movement
retention. Aging is accompanied by altered recruitment of premotor and contralateral homologues during motor tasks and by changes in myelination and thickness
Motor_cortex
Portion of the parietal lobe of the brain
anosognosia, constructional apraxia, dressing apraxia, contralateral hemispatial neglect, contralateral hemianopia, or lower quadrantanopia. Functional imaging
Inferior_parietal_lobule
Medical condition
is said to be "alternating" because the lesion causes symptoms both contralaterally and ipsilaterally. Sensation of pain and temperature is preserved,
Medial_medullary_syndrome
Loss of vision in a quarter of the visual field
pathway or Meyer's loop) which can lead to superior quadrantanopia on the contralateral side of both eyes (colloquially referred to as "pie in the sky"); if
Quadrantanopia
MRI sign of precentral gyrus
hemispheres at roughly the same level, and the side opposite a lesion (the contralateral omega) can be used to work out where a lesion sits in relation to the
Omega_sign
Failure of the forebrain to develop into two hemispheres during embryonic growth
M.H.E.; Osse, J.W.M. (2012). "An ancestral axial twist explains the contralateral forebain and the optic chiasm in vertebrates". Animal Biology. 62 (2):
Holoprosencephaly
Visual maladies
optic tract syndrome is characterized by a contralateral, incongruous homonymous hemianopia, contralateral relative afferent pupillary defect (RAPD),
Visual_pathway_lesions
Form of skew deviation
the contralateral inferior oblique while simultaneously inhibiting the ipsilateral inferior rectus muscle and its yoke i.e. the contralateral superior
Ocular_tilt_reaction
Region of the frontal cortex of the brain
the most important brain areas involved in the generation and control of eye movements, particularly in the direction contralateral to the frontal eye
Frontal_eye_fields
Cognitive processes necessary for control of behavior
electrical brain responses recorded over left and right visual cortex are enhanced when the subject is instructed to attend to the appropriate (contralateral) side
Executive_functions
Brain disorder
tumor of frontal lobe and gives rise to ipsilateral optic atrophy and contralateral papilledema. Frontal disinhibition syndrome, Fetal Alcohol Spectrum
Frontal_lobe_disorder
Relationship between handedness and the nervous system
right hand and vice versa. This theoretically means that the hemisphere contralateral to the dominant hand tends to be more dominant than the ipsilateral
Neuroanatomy_of_handedness
Consist of efferent and afferent fibers uniting the cortex
commissural projection neurons extend axons across the midline to the contralateral hemisphere; and corticofugal projection neurons extend axons away from
Projection_fiber
Basal ganglia movement disorder
type of hemiballismus, imaging reveals abnormalities in the putamen contralateral to the movements as well as the globus pallidus and caudate nucleus
Hemiballismus
Cranial nerve responsible for the face's senses and motor functions
fibers of the optic nerve cross (so each cerebral hemisphere receives contralateral—opposite—vision) to keep the interneuronal connections responsible for
Trigeminal_nerve
Largest part of the corticospinal tract
junction, which is the most posterior division of the brain) and proceeds down the contralateral side of the spinal cord. It is the largest part of the
Lateral_corticospinal_tract
Collection of brainstem nuclei related to hearing
the contralateral cochlear nucleus. Thus, the LSO receives excitatory input from the ipsilateral ear and inhibitory input from the contralateral ear.
Superior_olivary_complex
Structure in the brain
to and from the claustrum are ipsilateral (although there are still contralateral projections), and little evidence exists to describe its afferent or
Claustrum
Structure in the midbrain
the contralateral superior colliculus. In other mammals, the retinal ganglion cells throughout the contralateral retina project to the contralateral colliculus
Superior_colliculus
Disorder of consciousness caused by severe brain damage
unresponsiveness (PCU) is a disorder of consciousness in which patients with severe brain damage are in a state of partial arousal rather than true awareness. After
Vegetative_state
Ability to perceive differences in light frequency
nerves meet and information from the temporal (contralateral) visual field crosses to the other side of the brain. After the optic chiasma, the visual tracts
Color_vision
Sensory pathway from the skin to the thalamus
decussate across the anterior white commissure and ascend in the (now contralateral) lateral spinothalamic tract. These fibers will ascend through the brainstem
Spinothalamic_tract
Set of signs and symptoms that are associated with lesions of the optic chiasm
briefly loop back into the contralateral optic nerve sheath, before returning to the chiasm. This bend into the contralateral optic nerve had been called
Chiasmal_syndrome
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