Advanced Frontal Lobe Quiz

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

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

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

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

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

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

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

• The cerebellum loses all vestibular input
• Loss of contralateral saccadic drive leaves relatively unopposed activity from the opposite frontal eye field
• The optic chiasm rotates the eyes toward damaged cortex
• 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
• Heschl gyri
• Postcentral gyrus
• 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 fourth ventricle lies entirely within the frontal lobe
• The cerebral aqueduct traverses the frontal lobe
• The anterior horn of the lateral ventricle extends into 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?

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

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

• The region contains only sensory relay nuclei
• The medial frontal cortex contains only primary visual neurons
• Medial frontal networks contribute to initiation, motivation, and internally generated action
• 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
• Calcarine sulcus
• Lateral geniculate body
• Collateral sulcus

Q10. Which statement best integrates frontal lobe anatomy?

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