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Prep for USMLE Forum USMLE Step 1 Forum Anatomy Forum Brain Stem Lesion Syndromes

Br a i n S t em L e s i on Syn d r om es

Title Brain Stem Lesion Syndromes

Message Text MIDBRAIN LESION---

1. Weber's syndrome

Fibres of III.Descending motor fibres in cerebral peduncle.

Ipsilateral oculomotor palsy.Contralateral hemiplegia

2. Benedikt's syndrome

Fibres of III.Descending motor fibres in cerebral peduncle.Red nucleus and nearby cerebellothalamic fibres.

Ipsilateral oculomotor palsy.Contralateral hemiplegia.Contralateral tremor.(Tremor is usually attributed to interruption of cerebellothalamic fibres but it may be continuous,from involvement of pallidothalamic fibres rostral to the red nucleus)

3. Parinaud's syndrome

Pressure on superior colliculi, usually by a pineal tumour, is transmitted to pre-oculomotor nuclei in regionof posterior commissure and periaqueductal region

Paralysis of upward gaze and convergence, often accompanied by other pupillary and eye movementabnormalities.Various pre-oculomotor nuclei, concerned with vertical eye movements, are present in the affected region.

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Submission Date Mar 31, 2007

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