Question

Somatotopically organised so how will the upper and lower limb be represented?

A) Upper limbs are medial and lower limbs are lateral
B) Upper limbs are lateral and lower limbs are medial
C) Upper limbs are anterior and lower limbs are posterior
D) Upper limbs are posterior and lower limbs are anterior

Answer 1

In the primary motor cortex, the upper limbs are represented laterally, while the lower limbs are located medially. This reflects the somatotopic organization, with answer B) Upper limbs are lateral and lower limbs are medial being correct.

Step-by-step explanation:

The question pertains to how the upper and lower limbs are represented in the primary motor cortex, which is somatotopically organized. The neurons responsible for the upper and lower limbs are arranged in a specific way within the motor cortex, as seen in the motor homunculus. For the upper limbs, neurons are located in the lateral part of the motor cortex, whereas for the lower limbs, neurons are in the medial wall of the cortex. Therefore, the correct answer is B) Upper limbs are lateral and lower limbs are medial. This arrangement reflects the somatotopic organization of the motor cortex where body parts are represented based on their usage and the degree of control required for their movements.