Question

which body part is associated with greatest amount of brain tissue in the motor cortex

Answer 1

The sensory cortex is most critical for our sense of touch. Which of the following body parts is associated with the greatest amount of brain tissue in the motor cortex? motor cortex.

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Answer 2

Answer:

The correct answer is : face.

More cortical tissue is devoted to the parts of skin with more receptors, such as the face, hands, and fingers.

Explanation :

• We know that, three distinct regions of the frontal lobe, directly anterior to the central sulcus, make up the motor cortex.
• The primary motor cortex, premotor cortex, and supplementary motor area are these regions.
• These regions respond to electrical stimulation by moving certain body components.
• Also we can say that on the medial surface of the brain, the precentral gyrus and anterior paracentral lobule are home to the primary motor cortex, or M1.
• Furthermore, the main motor cortex, out of the three motor cortex regions, takes the least electrical current to stimulate a movement. Simple movements of particular body parts are often induced by low doses of short stimulation.
• Premotor cortex stimulation or stimulation of the supplemental motor area generally produces motions that are more sophisticated than those produced by primary motor cortex stimulation and requires greater current levels.
• In monkeys, stimulation for longer durations (500 msec) causes a specific body part to migrate to a stereotyped posture or position, regardless of the body part's initial starting point.
• As a result, it appears that the premotor cortex and supplementary motor areas are higher level regions that encode complicated patterns of motor output and choose the best motor strategies to attain desired outcomes.

• The motor cortex can affect muscles in a number of different ways that descend.
• Motor cortex output may have an impact on some of the descending pathways that were discussed in the previous chapter.
• Thus, the remaining descending tracts are influenced by the following cortical efferent routes in addition to the corticospinal tract, which provides alpha motor neurons with direct cortical innervation:

1. The cortex can control the rubrospinal tract thanks to the corticorubral tract.
2. The tectospinal tract can be modulated by the brain thanks to the corticotectal tract.
3. The reticulospinal tracts can be modulated by the cortex thanks to the corticoreticular tract.

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