12. The Central Nervous System

Which of the following body parts would you expect to have the greatest size difference between its area on the motor homunculus and its area on the sensory homunculus?

The prefrontal cortex & Wernicke's area can both be classified as association areas, while Broca's area is classified as a motor area.

Which of the following diseases would you expect might result from a dysfunction of the basal nuclei?

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.

The only cranial nerves that are attached to the cerebrum are the____ nerves.

(a) optic

(b) oculomotor

(c) trochlear

(d) olfactory

(e) abducens

Mark the following statements about the brain as true or false. If a statement is false, correct it to make a true statement.

The cerebrum is responsible for our basic, involuntary functions and reflexes.

Which statement about cerebral white matter is false?

a. Commissural fibers connect the right and left cerebral hemispheres.

b. Projection fibers connect the cerebral cortex of one hemisphere with structures in the other hemisphere.

c. The corpus callosum is the largest bundle of white matter in the brain.

d. Association fibers connect the gyri of the cerebral cortex with one another.

Mark the following statements about the cerebral cortex as true or false. If a statement is false, correct it to make a true statement.

The neocortex is the 'newest' component of the cerebral cortex from an evolutionary perspective.