lesion to area-6 of the brain results in the following except.
a) inability to excute skilled movement.
b) spactic paralysis on opposite side of the body.
c) loss of grasp reflex.
d) none
b) spastic paralysis on opposite side of the body.
The correct answer is d) none. A lesion to area 6 of the brain, also known as the precentral gyrus or primary motor cortex, can result in several motor deficits. These include an inability to execute skilled movements (a), spastic paralysis on the opposite side of the body (b), and a loss of the grasp reflex (c). Therefore, the correct statement is that a lesion to area 6 of the brain does not result in "none" of these symptoms.
To determine the correct answer, we need to understand the functions associated with area 6 of the brain. Area 6, also known as the premotor cortex or supplementary motor area, is involved in the planning and execution of skilled movements.
Now let's evaluate each option:
a) Inability to execute skilled movement: This is a characteristic associated with a lesion in area 6. When there is damage to this area, it can result in difficulty or inability to perform skilled movements.
b) Spastic paralysis on the opposite side of the body: This is not a characteristic of a lesion in area 6. The premotor cortex primarily controls movement planning and coordination, but it does not directly control the contralateral (opposite) side of the body.
c) Loss of grasp reflex: This is not a characteristic of a lesion in area 6. The grasp reflex is primarily controlled by the primary motor cortex and not the premotor cortex.
d) None: It is possible that none of the options fully match the consequences of a lesion in area 6. However, by analyzing the options provided, option b stands out as the one that does not align with the functions associated with lesion in area 6.
Therefore, the correct answer is option b) spastic paralysis on the opposite side of the body.