Cerebellum MCQs

Explanation: Neocerebellar lesions cause incoordination of voluntary limb movements, leading to intention tremors, dysmetria, dysdiadochokinesis, asynergia and dysarthria. However, astereognosis is not a cerebellar function, it is a parietal lobe lesion finding (somatosensory cortex), where the patient can not recognise objects by touch. Hence asteriognosis is the only symptom that does not belong to neocerebellar involvement . Astereognosis is associated with lesion in parietal lobe.

Ans. is 'a' i.e., Cerebellum o Medulloblastoma is an infratentorial tumor and occurs exclusively in cerebellum. 520. Type B adverse drug reaction - a) Augmented effect of drug b) Unpredictable Bizzare reaction c) Effect seen on chronic use of drug d) Delayed effect of drug Correct Answer - B Ans. is 'b' i.e., Unpredictable Bizzare reaction Types of adverse drug reaction

Explanation: White matter of the pons consists of longitudinal and transverse fibres. The longitudinal fibres include: The corticospinal tracts The corticonuclear (pyramidal) tracts The corticopontine fibres ending in the pontine nuclei. The transverse fibres are pontocerebellar fibres beginning from the pontine nuclei and going to the opposite half of the cerebellum, through the middle cerebellar peduncle.

The correct answer is Fastigial nucleus. The flocculo-nodular lobe circuitry of the cerebellum is primarily involved in coordinating eye movements and balance. The Fastigial nucleus is responsible for receiving input from the flocculo-nodular lobe and sending output to the vestibular nuclei, which are important for balance control. Therefore, lesioning the Fastigial nucleus would specifically target the circuitry related to the flocculo-nodular lobe. Reference : Textbook of Gray's Anatomy for students, 3rd Edition, Head and Neck, Page number - 841

Purkinje cells are the major output neurons of the cerebellar cortex. They receive inputs from various sources within the cerebellum and send their axons to different targets outside the cerebellum. These cells play a crucial role in motor coordination and learning. They are characterized by their distinctive morphology, with a large, flat dendritic tree that receives inputs from parallel fibers and a single axon that projects to the deep cerebellar nuclei. Purkinje cells are critical for the integration and modulation of motor signals, making them the major output neurons of the cerebellar cortex. Reference : Textbook of Gray's Anatomy for students, 3rd Edition, Head and Neck, Page number - 841

The patient's symptoms of slurred speech and dysmetria on the left side indicate a lesion in the left cerebellar hemisphere. The cerebellum is responsible for coordinating voluntary movements, including speech and limb movements. Lesions in the cerebellar hemisphere can result in ipsilateral (same side) symptoms, such as the ones seen in this patient. Reference: Textbook of Gray’s Anatomy for students, 3rd Edition, Head and Neck Page number - 841

The patient's symptoms of an unsteady "drunk like" gait and swaying suggest that the cerebellar hemorrhage affected the flocculonodular lobe. The flocculonodular lobe is responsible for coordinating balance and posture, and damage to this region can result in ataxia and unsteady movements. Reference : Textbook of Gray's Anatomy for students, 3rd Edition, Head and Neck, Page number - 841

Efferent axons from the dentate nucleus terminate in the ventral lateral nucleus of the thalamus (VL) and travel through the superior cerebellar peduncle. Reference : Textbook of Gray's Anatomy for students, 3rd Edition, Head and Neck, Page number - 841