Chapter 12, Problem 1MC

Summary Introduction

To determine:

The lobe in which primary motor cortex, Broca’s area, and premotor cortex are located:

1. frontal

2. parietal

3. temporal

4. occipital

Answer to Problem 1MC

Correct answer:

(a) Frontal: Broca’s area, the primary motor cortex, and the premotor cortex are found in the frontal lobe of the brain.

Explanation for the correct answer:

The brain of an individual consists of four different lobes. The frontal lobe is one among the four lobes and is the largest of all. It is located in the front portion of the brain. The primary motor cortex is responsible for controlling the motor functions and voluntary movements of the body and broca’s area is involved in the production of speech. So option (a) is considered as a correct answer.

Explanation of Solution

Explanation for the incorrect answers:

Option (b) is given as parietal lobe. Whereas primary motor cortex, Broca’s area, and premotor cortex are located in the frontal lobe of the brain. Parietal lobe is characterized by the presence of brodmann area 3, the primary somatosensory cortical area. Thus this option is considered as an incorrect answer.

Option (c) is given as temporal lobe. Whereas primary motor cortex, Broca’s area, and premotor cortex are located in the frontal lobe of the brain. Temporal lobe consists the hippocampus that is critical for long term memory. Thus this option is considered as an incorrect answer.

Option (d) is given as occipital lobe. Whereas primary motor cortex, Broca’s area, and premotor cortex are located in the frontal lobe of the brain. Occipital lobe acts as visual processing center of the brain and consist most of the anatomical region of visual cortex. Thus this option is considered as an incorrect answer.

Hence, option (b), (c) and (d) are considered as incorrect options.

Conclusion

Thus it is concluded that frontal lobe is one among the four lobes of the brain and consists primary motor cortex, Broca’s area, and premotor cortex. The primary motor cortex is responsible for controlling the motor functions and voluntary movements of the body and broca’s area is involved in the production of speech.