Cerebrum MCQs

Ans. is 'c' i.e., Lunate Operculated sulcus separates by its lips into two areas and contains a third area in the walls of the sulcus e.g. lunate sulcus is an operculated sulcus, separating the striate and parastriate areas. Axial → Posterior part of calcarine sulcus Limiting → Central sulcus Anterior part of calcarine sulcus Operculated → Lunate sulcus Complete → Collateral sulcus, Anterior part of calcarine sulcus

Superior branches of MCA supply these key functional areas: Primary motor cortex for face and arm, and axons originating in the leg as well as face and arm areas that are headed for the internal capsule as part of the corticobulbar or corticospinal tracts Broca's area and other related gray and white matter important for language expression- in the language-dominant (usually left) hemisphere Frontal eye fields (important for 'looking at' eye movements to the opposite side) Primary somatosensory cortex for face and arm Parts of lateral frontal and parietal lobes important for 3-D visuospatial perceptions of one's own body and of the outside world, and for ability to interpret and express emotions--in the nondominant (usually right) hemisphere Reference : Textbook of Gray's Anatomy for students, 3rd Edition, Head and Neck, Page number - 879

Explanation: Tactile agnosia (astereognosis) occurs when the sensory association area in the superior parietal lobule is damaged. This area corresponds to Brodmann areas 5 and 7, which help perceive the shape, size, and texture of objects and allow stereognosis. Other areas have different functions: 3,1,2 is primary sensory cortex, 39,40 is Wernicke's area, 44,45 is Broca's area.