Advanced Cerebrum Quiz

Q1. Why can a small internal capsule lesion cause extensive contralateral motor weakness?

• The lesion directly severs all peripheral nerves
• The internal capsule contains lower motor neuron cell bodies for every muscle
• The internal capsule contains only ipsilateral sensory fibers
• Major descending motor fibers are tightly concentrated in a small region

Q2. Why can a middle cerebral artery infarct produce both motor and sensory deficits affecting the contralateral face and upper limb?

• The MCA supplies only the medial lower-limb cortex
• The MCA supplies only the cerebellum
• The MCA supplies lateral motor and somatosensory cortex containing major face and upper-limb representations
• The MCA directly supplies peripheral nerves

Q3. Why can an anterior cerebral artery infarct disproportionately affect the contralateral lower limb?

• The ACA directly supplies the femoral nerve
• The ACA supplies the primary visual cortex exclusively
• The ACA supplies medial motor and sensory cortex representing the lower limb
• The ACA supplies only the lateral face cortex

Q4. Why can a posterior cerebral artery infarct produce a contralateral homonymous visual field defect?

• The PCA supplies occipital visual cortex representing the contralateral visual field
• The PCA supplies primary motor cortex for the eye muscles
• The PCA destroys the ipsilateral optic nerve
• The PCA interrupts the facial nerve

Q5. What is the functional importance of the corpus callosum?

• It produces cerebrospinal fluid
• It carries all corticospinal fibers into the spinal cord
• It supports communication between the cerebral hemispheres
• It forms the floor of the fourth ventricle

Q6. Why are cerebral cortical folds anatomically important?

• They increase cortical surface area and create landmarks for localization
• They prevent all communication between cortical areas
• They are formed by dural venous sinuses
• They separate gray matter completely from white matter

Q7. Which relationship best describes the cerebral cortex and deep nuclei?

• Superficial cortical gray matter overlies white matter containing deep gray nuclei
• All cerebral gray matter lies only on the surface
• Deep nuclei are located outside the cerebral hemispheres
• The cortex is composed entirely of myelinated axons

Q8. Why can dominant-hemisphere cerebral lesions cause language deficits?

• Language depends only on the cerebellar vermis
• Language is confined to primary visual cortex
• Language fibers travel exclusively through the spinal cord
• Language relies on connected dominant frontal, temporal, and parietal cortical networks

Q9. Why can cerebral white matter lesions disconnect functions even when cortical regions themselves remain structurally intact?

• White matter pathways are required for communication among cortical and subcortical regions
• Only cortical neuron cell bodies transmit information
• All cerebral pathways travel through cerebrospinal fluid
• White matter has no role in neural communication

Q10. Which statement best integrates the anatomical organization of the cerebrum?

• It contains no ventricles or commissural connections
• It integrates cortical lobes, deep nuclei, white matter pathways, ventricular anatomy, interhemispheric connections, functional localization, and major cerebral arterial territories
• It is supplied exclusively by branches of the basilar artery
• It consists only of cerebral cortex without deep structures