Left Cerebral Peduncle (Crus Cerebri) (Crus cerebri sinister)
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Anatomy
The left cerebral peduncle (crus cerebri) is a massive column of descending axonal white matter on the ventrolateral aspect of the left midbrain. It carries corticospinal (motor to limbs), corticobulbar (motor to cranial nerves), and corticopontine motor projection fibers from the cerebral cortex to the brainstem and spinal cord.
Clinical notes
Weber syndrome (superior alternating hemiplegia) is an anterior midbrain infarct involving the crus cerebri and exiting oculomotor nerve fascicles, producing ipsilateral third-nerve palsy and contralateral spastic hemiplegia.
Related structures
Educational references
FAQ
What is the role of the Left Cerebral Peduncle (Crus Cerebri)?
The left cerebral peduncle (crus cerebri) is a massive column of descending axonal white matter on the ventrolateral aspect of the left midbrain. It carries corticospinal (motor to limbs), corticobulbar (motor to cranial nerves), and corticopontine motor projection fibers from the cerebral cortex to the brainstem and spinal cord.
Why is the Left Cerebral Peduncle (Crus Cerebri) clinically important?
Weber syndrome (superior alternating hemiplegia) is an anterior midbrain infarct involving the crus cerebri and exiting oculomotor nerve fascicles, producing ipsilateral third-nerve palsy and contralateral spastic hemiplegia.
Source & license
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