Advanced Frontal Lobe Quiz

Q1. Why can an anterior cerebral artery infarct cause prominent contralateral lower-limb weakness?

• It supplies only the lateral face area of motor cortex
• It directly interrupts the femoral nerve
• It can damage the medial motor cortex representing the contralateral lower limb
• It damages the cerebellar hemisphere

Q2. Why can a middle cerebral artery lesion cause prominent contralateral face and upper-limb weakness?

• It supplies lateral motor cortex containing major face and upper-limb representations
• It supplies the spinal anterior horn
• It supplies only the medial lower-limb cortex
• It directly innervates the brachial plexus

Q3. What is the anatomical basis of Broca aphasia after a dominant frontal lesion?

• Damage is confined to primary visual cortex
• The lesion destroys the cochlea
• Damage involves dominant posterior inferior frontal language cortex and its network connections
• The lesion affects only the nondominant occipital lobe

Q4. Why can a destructive frontal eye field lesion cause the eyes to deviate toward the side of the lesion?

• The optic chiasm rotates the eyes toward damaged cortex
• The cerebellum loses all vestibular input
• Loss of contralateral saccadic drive leaves relatively unopposed activity from the opposite frontal eye field
• The oculomotor nerve directly pulls both eyes toward the lesion

Q5. Which frontal lobe region is particularly associated with executive planning, working memory, and behavioral regulation?

• Primary visual cortex
• Postcentral gyrus
• Heschl gyri
• Prefrontal cortex

Q6. What is the relationship of the frontal lobe to the anterior horn of the lateral ventricle?

• The frontal lobe contains no ventricular relationship
• The cerebral aqueduct traverses the frontal lobe
• The anterior horn of the lateral ventricle extends into the frontal lobe
• The fourth ventricle lies entirely within the frontal lobe

Q7. Which medial frontal gyrus lies immediately superior to the corpus callosum and is functionally associated with the limbic lobe rather than ordinary neocortical lobe boundaries?

• Cingulate gyrus
• Angular gyrus
• Precentral gyrus
• Gyrus rectus

Q8. Why can a lesion of medial frontal cortex affect initiation of movement and behavior beyond causing weakness?

• Medial frontal networks contribute to initiation, motivation, and internally generated action
• The medial frontal cortex contains only primary visual neurons
• The region contains only sensory relay nuclei
• All initiation of behavior occurs exclusively in the medulla

Q9. Which anatomical landmark helps identify the boundary between primary motor and primary somatosensory cortex?

• Central sulcus
• Lateral geniculate body
• Collateral sulcus
• Calcarine sulcus

Q10. Which statement best integrates frontal lobe anatomy?

• It contains no medial or orbital surfaces
• Its cortex is supplied exclusively by the posterior cerebral artery
• It combines motor, premotor, eye movement, language-related, executive, medial, and orbital cortical regions organized around characteristic sulci and vascular territories
• It is composed entirely of primary motor cortex