A brain haemorrhage within the region of the right internal capsule results in paralysis of the left side of the body because the motor area of the igt hemisphere of the cerebrum controls the muscle movement on the right side of the body and vice versa.
Explanation: The primary motor area lies in the frontal lobe of the brain immediately anterior to the central sulcus.the cell bodies are pyramid shaped and they control skeletal muscle activities.two neurons are involved in the pathway to skeletal muscle(the upper motor neurone and the lower motor neurone).The upper motor neurone descends from the motor cortex if the brain through the internal capsule of the medulla oblongata,then it CROSSES TO THE OPPOSITE SIDE and descends in the spinal cord.
From the spinal cord,it joins with the lower motor neurone whivh leaves the spinal cord and goes to the target muscle.
When either of these neurones is damaged,it results to paralysis.
The left side (rather than the right side) is affected when there is
hemorrhage in the right internal capsule as a result of the left side of the
internal capsule transmitting nerve signals for movement of the left side of
the body and vice versa.
The left and right capsules contain white matter which are found in the
cerebral hemisphere of the brain. They transmit signals to the brain which is
needed for movement of parts of the body.
The left side of the internal capsule transmits nerve signals for movement of the right side of the body and the right side of the internal capsule transmits nerve signals for movement of the left side of the body. This explains why the left side was affected instead of right side.
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