Question

a. Make a rough drawing of the lateral aspect of the left cerebral hemisphere.
b. You may be thinking, 'But I just can't draw!' So, name the hemisphere involved with most people's ability to draw.
c. On your drawing, locate the following areas and provide the major function of each: primary motor cortex, premotor cortex, somatosensory association cortex, primary somatosensory cortex, visual and auditory areas, prefrontal cortex, Wernicke's and Broca's areas.

Accepted Answer

Step 1: For part (a), start by sketching the outline of the left cerebral hemisphere from a lateral (side) view. Include major landmarks such as the frontal lobe at the front, parietal lobe on top and toward the back, temporal lobe below the parietal lobe, and occipital lobe at the rear. This will help you place the functional areas accurately. Step 2: For part (b), understand that the hemisphere most involved with drawing and artistic abilities is typically the right cerebral hemisphere. This is because the right hemisphere is generally associated with creativity, spatial ability, and visual imagery, which are important for drawing. Step 3: For part (c), on your drawing, locate the primary motor cortex along the precentral gyrus of the frontal lobe. Its major function is to control voluntary muscle movements. Step 4: Next, identify the premotor cortex just anterior to the primary motor cortex; it is involved in planning and coordinating complex movements. Then, locate the primary somatosensory cortex on the postcentral gyrus of the parietal lobe, which processes tactile information from the body. Step 5: Also mark the somatosensory association cortex posterior to the primary somatosensory cortex, responsible for integrating sensory input to understand object size, shape, and texture. Place the visual areas in the occipital lobe (processing visual information) and auditory areas in the superior temporal lobe (processing sound). Finally, locate the prefrontal cortex in the anterior frontal lobe (involved in decision making and personality), Wernicke's area in the posterior part of the superior temporal gyrus (language comprehension), and Broca's area in the inferior frontal gyrus (speech production).

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Key Concepts

Anatomy of the Cerebral Hemisphere

Functional Localization in the Cerebral Cortex

Hemispheric Specialization and Dominance