Brain Control over Muscle MovementV

Brain Control over Muscle Movement
Voluntary control of skeletal muscle originates from the cerebral cortex of the brain. When a
person wishes to contract a muscle to generate movement, the signal originates from the motor
strip in the cerebral cortex. The motor cortex (Fig 1) can be broken down into three areas
including the primary motor cortex, the premotor cortex, and the supplementary cortex. Each
area is organized topographically with different parts of the body represented in different parts of
the cortical area. In fact, over 50% of the motor cortex is responsible for manipulating the hand
muscles and speech. The premotor cortex is responsible for coarse movement of muscle groups.
The premotor cortex prepares muscles for a specific task, such as positioning the arms and
shoulder to initiate writing. The supplementary motor cortex works along with the primary
cortex to create muscle movement. The supplementary motor cortex is known to provide
bilateral control. Torso positioning is accomplished by the supplementary motor cortex.
Experiments measuring blood perfusion to the brain using functional MRI have shown that the
supplementary motor cortex is also responsible for the mental conception of movement.
Researchers have found that when a person thinks about moving their fingers increased blood
flow to the supplementary motor cortex occurs, even though no action is being performed. These
signals from the motor cortex are then transmitted down the spinal cord over motorneurons and
activate the muscle fibers.

Kết quả (Việt) 1:

Brain Control over Muscle MovementVoluntary control of skeletal muscle originates from the cerebral cortex of the brain. When aperson wishes to contract a muscle to generate movement, the signal originates from the motorstrip in the cerebral cortex. The motor cortex (Fig 1) can be broken down into three areasincluding the primary motor cortex, the premotor cortex, and the supplementary cortex. Eacharea is organized topographically with different parts of the body represented in different parts ofthe cortical area. In fact, over 50% of the motor cortex is responsible for manipulating the handmuscles and speech. The premotor cortex is responsible for coarse movement of muscle groups.The premotor cortex prepares muscles for a specific task, such as positioning the arms andshoulder to initiate writing. The supplementary motor cortex works along with the primarycortex to create muscle movement. The supplementary motor cortex is known to providebilateral control. Torso positioning is accomplished by the supplementary motor cortex.Experiments measuring blood perfusion to the brain using functional MRI have shown that thesupplementary motor cortex is also responsible for the mental conception of movement.Researchers have found that when a person thinks about moving their fingers increased bloodflow to the supplementary motor cortex occurs, even though no action is being performed. Thesetín hiệu từ vỏ động cơ sau đó được truyền xuống tủy qua motorneurons vàkích hoạt các sợi cơ bắp.