Advanced Frontal Lobe Quiz

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

• 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
• It damages the cerebellar hemisphere

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

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

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

• Damage is confined to primary visual cortex
• 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

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

• 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
• The optic chiasm rotates the eyes toward damaged cortex
• The cerebellum loses all vestibular input

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

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

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

• The cerebral aqueduct traverses the frontal lobe
• The frontal lobe contains no ventricular relationship
• 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?

• 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?

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

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

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

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