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Cerebellar Ataxia definition: Incoordination of voluntary movements that occur as a manifestation of CEREBELLAR DISEASES. Characteristic features include a tendency for limb movements to overshoot or undershoot a target (dysmetria), a tremor that occurs during attempted movements (intention TREMOR), impaired force and rhythm of diadochokinesis (rapidly alternating movements), and GAIT ATAXIA. (From Adams et al., Principles of Neurology, 6th ed, p90)
Cerebellar Cortex definition: The superficial gray matter of the cerebellum. It consists of two main layers, the stratum moleculare and the stratum granulosum. (Dorland, 28th ed)
cerebellar cortex definition: superficial gray matter of the cerebellum; consists of two main layers, the stratum moleculare and the stratum granulosum.
Cerebellar Diseases definition: Diseases that affect the structure or function of the cerebellum. Cardinal manifestations of cerebellar dysfunction include dysmetria, GAIT ATAXIA, and MUSCLE HYPOTONIA.
cerebellar disorder definition: condition in which there is a deviation from or interruption of the normal structure or function of the cerebellum; manifestations of cerebellar dysfunction include dysmetria, gait ataxia, and muscle hypotonia.
Myoclonic Cerebellar Dyssynergia definition: A condition marked by progressive CEREBELLAR ATAXIA combined with MYOCLONUS usually presenting in the third decade of life or later. Additional clinical features may include generalized and focal SEIZURES, spasticity, and DYSKINESIAS. Autosomal recessive and autosomal dominant patterns of inheritance have been reported. Pathologically, the dentate nucleus and brachium conjunctivum of the CEREBELLUM are atrophic, with variable involvement of the spinal cord, cerebellar cortex, and basal ganglia. (From Joynt, Clinical Neurology, 1991, Ch37, pp60-1)
Cerebellar Neoplasms definition: Primary or metastatic neoplasms of the CEREBELLUM. Tumors in this location frequently present with ATAXIA or signs of INTRACRANIAL HYPERTENSION due to obstruction of the fourth ventricle. Common primary cerebellar tumors include fibrillary ASTROCYTOMA and cerebellar HEMANGIOBLASTOMA. The cerebellum is a relatively common site for tumor metastases from the lung, breast, and other distant organs. (From Okazaki & Scheithauer, Atlas of Neuropathology, 1988, p86 and p141)
Cerebellar Neoplasm definition: A benign or malignant (primary or metastatic) tumor involving the cerebellum. -- 2003
Cerebellar Nuclei definition: Four accumulations of gray substance embedded in the white substance of the cerebellum, comprising the nucleus dentatus, nucleus emboliformis, nucleus globosus, and nucleus fastigii. (Dorland, 28th ed)
cerebellar nuclei definition: four accumulations of gray substance embedded in the white substance of the cerebellum from which most of the efferent fibers of the cerebellum arise; comprised of the nucleus dentatus, nucleus emboliformis, nucleus globosus, and nucleus fastigii.
Cerebellum definition: The part of brain that lies behind the BRAIN STEM in the posterior base of skull (CRANIAL FOSSA, POSTERIOR). It is also known as the "little brain" with convolutions similar to those of CEREBRAL CORTEX, inner white matter, and deep cerebellar nuclei. Its function is to coordinate voluntary movements, maintain balance, and learn motor skills.
cerebellum definition: part of the metencephalon that lies in the posterior cranial fossa behind the brain stem; it is involved in the coordination of movement.
cerebellum definition: (sair-uh-BELL-um) The portion of the brain in the back of the head between the cerebrum and the brain stem. The cerebellum controls balance for walking and standing, and other complex motor functions.
Cerebellum definition: Organ component of neuraxis that has as its parts the cerebellar cortex, cerebellar nuclear complex and cerebellar white matter. Examples: There is only one cerebellum.
Malignant Cerebellar Neoplasm definition: Primary and secondary (metastatic) malignant tumors that occur in the cerebellum. Histologic types include medulloblastomas, high grade (WHO Stage III or IV) cerebellar astrocytomas, lymphomas, gangliogliomas, gliosarcomas, and several other subtypes. The most frequent malignant cerebellar neoplasm of childhood is medulloblastoma. In adults, metastases from other sites are relatively common. Clinical features include ataxia, headache, nausea, dizzyness, nystagmus, diplopia, papilledema, etc.
Cerebellar Sarcoma definition: An obsolete term referring to desmoplastic medulloblastoma.
Cerebellar Astrocytoma definition: Benign and malignant neoplasms of the cerebellum that arise from astrocytes. During childhood the majority are benign pilocytic astrocytomas. In adults both benign and relatively higher grade forms may occur. The most common presenting symptoms are headache, nausea, vomiting, ataxia of gait or limb, paresis, diplopia, and dizziness. Objective signs include weakness, long tract signs, dysmetria, gait ataxia, papilledema, and nystagmus. Surgical resection is often curative.
Cerebellar Capillary Hemangioblastoma definition: A histologically benign tumor, usually cystic with a vascular mural nodule, that is most often found in the cerebellum though it has been reported at other sites within the neuraxis. It is associated with von Hippel-Lindau disease (VHL gene located on chr 3p25-26).
Cerebellar Liponeurocytoma definition: A rare, WHO grade I or II cerebellar neoplasm which shows advanced neuronal/neurocytic and focal lipomatous differentiation. It occurs in adults, has a low proliferative potential and has a favorable prognosis. (Adapted from WHO)
Cerebellar Paraganglioma definition: A benign or malignant extra-adrenal paraganglioma arising from the cerebellum.
cerebellare definition: [1] zerebellar (das Kleinhirn betreffend)