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The brain is a complex organ that controls thought, memory, emotion, touch, motor skills, vision, and every process that regulates the body. The brain and spinal cord make up the central nervous system, which is responsible for receiving, processing, and responding to sensory information. The peripheral nervous system, on the other hand, controls voluntary movements and is divided into the somatic and autonomic nervous systems. Within the brain, the frontal lobe is the largest lobe and is involved in movement, personality characteristics, and decision-making. While the frontal lobe plays a role in voluntary movement, it is the motor cortex, a zone of the cerebrum located behind the frontal lobe, that sends neural messages to the muscles, enabling voluntary movement. These neural messages travel through the brain stem along the spinal cord and into the neural network to the muscle being commanded.
| Characteristics | Values |
|---|---|
| Part of the brain that controls voluntary muscles | Motor cortex, a zone of the cerebrum located behind the frontal lobe |
| Function of the motor cortex | Plans voluntary actions, coordinates sequences of movements, makes decisions about behavioral strategies and choices, evaluates the appropriateness of a particular action, and relays commands to the appropriate sets of lower motor neurons to execute the desired actions |
| Involuntary muscle movements | Controlled by other regions of the brain such as the hypothalamus |
| Brain weight | About 3 pounds in the average adult |
| Brain composition | 60% fat, 40% water, protein, carbohydrates, and salts |
| Brain functions | Controls thought, memory, emotion, touch, motor skills, vision, breathing, temperature, hunger, and every process that regulates the body |
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What You'll Learn
- The motor cortex controls voluntary muscles
- The peripheral nervous system controls voluntary movements
- The brain and spinal cord make up the central nervous system
- The cerebellum is involved in body balance and voluntary muscle movement
- The frontal lobe is involved in movement, personality, and decision-making
The motor cortex controls voluntary muscles
The brain is a complex organ that controls thought, memory, emotion, touch, motor skills, vision, and every process that regulates the body. The brain and spinal cord together make up the central nervous system (CNS). The nervous system is further divided into the CNS and the peripheral nervous system. The CNS is responsible for receiving, processing, and responding to sensory information.
Voluntary movements are commanded by the motor cortex, a zone of the cerebrum located behind the frontal lobe. The motor cortex sends neural messages through the brain stem and along the spinal cord to the muscle being commanded. The muscle is stimulated by the neural message and contracts. The motor cortex comprises three different areas of the frontal lobe: the primary motor cortex, the premotor cortex, and the supplementary motor area. The primary motor cortex encodes the force and direction of a movement, and the amount of force required depends on which individual muscles are used. Alpha motor neurons in the spinal cord encode the force of contraction of groups of muscle fibers.
The cerebellum also plays a role in voluntary movement. It communicates with the cerebral cortex, taking higher-level instructions from the brain, processing them through the cerebellar cortex, and then sending messages to the cerebral motor cortex to make voluntary muscle contractions.
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The peripheral nervous system controls voluntary movements
The nervous system is divided into the central nervous system (CNS) and the peripheral nervous system. The CNS includes the brain and spinal cord, while the peripheral nervous system consists of everything else. The peripheral nervous system plays a key role in sending information from different areas of the body to the brain and carrying out commands from the brain to various parts of the body.
The peripheral nervous system is further divided into the somatic nervous system and the autonomic nervous system. The somatic nervous system is responsible for delivering command signals to all the muscles in the body that can be consciously controlled. The autonomic nervous system, on the other hand, controls the automatic functions of the organs and systems in the body, such as the heart rate, breathing, blood pressure, and digestion.
Voluntary movements are commanded by the motor cortex, a zone of the cerebrum located behind the frontal lobe. The motor cortex sends neural messages through the brain stem along the spinal cord and into the neural network to the muscle being commanded. The muscle, stimulated by the neural message, then contracts. The cerebellum, or the "little brain," is also responsible for smooth, coordinated voluntary movements.
Damage to the peripheral nerves can result in muscle weakness or paralysis. For example, dysfunction of the motor nerves, which control muscle movement, can lead to muscles weakening or becoming paralyzed. Similarly, damage to the myelin sheath, a membrane surrounding the axon that enables nerve impulses to travel quickly, can cause Guillain-Barré syndrome.
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The brain and spinal cord make up the central nervous system
The brain and spinal cord are the two main components of the central nervous system (CNS). The nervous system is divided into the CNS and the peripheral nervous system, which consists of everything else. The brain and spinal cord are protected by bone: the brain by the skull, and the spinal cord by the bony vertebrae of the backbone. They are also cushioned by layers of membranes (meninges) and cerebrospinal fluid, which flows through the ventricles in the brain and around the spine in the spinal column. This fluid protects the CNS, nourishes it, and removes waste products.
The brain is like a central computer that controls the body's functions, and the nervous system is like a network that relays messages to different parts of the body. The largest part of the brain, the cerebrum, has two hemispheres. The frontal lobe, located behind the forehead, is responsible for complex thinking, such as planning, imagining, decision-making, and reasoning. The parietal lobe, located behind the frontal lobe, processes information related to touch, taste, and temperature. The temporal lobe, found near the ears, enables us to understand sounds and language, recognise objects and faces, and form memories. At the rear of the brain, the occipital lobe processes light and visual information, allowing us to see.
The brain stem connects the brain to the spinal cord and consists of the midbrain, pons, and medulla oblongata. The pons relays messages from the cerebrum to the cerebellum and spinal cord and helps control facial movements. The midbrain facilitates eye movements and enables communication between the brain and the rest of the nervous system. The brain stem regulates essential functions, such as heartbeat and breathing.
The cerebellum uses Purkinje cells and cerebellar peduncles to communicate with other parts of the brain. The superior cerebellar peduncle, composed of white matter, connects the cerebellum to the midbrain and enables arm and leg coordination. The inferior cerebellar peduncle connects the medulla and cerebellum, using proprioceptors to maintain balance and posture. The middle cerebellar peduncle is a one-way communication pathway from the pons to the cerebellum, primarily composed of afferent fibres that inform the cerebellum about voluntary motor actions.
The brain controls voluntary and involuntary muscle movements. Voluntary movements are commanded by the motor cortex, located in the cerebrum behind the frontal lobe. The motor cortex sends neural messages through the brain stem and spinal cord to the muscles, causing them to contract and enabling voluntary movements. Involuntary muscles, such as those in the stomach wall, are controlled by other regions deep within the brain, like the hypothalamus.
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The cerebellum is involved in body balance and voluntary muscle movement
The cerebellum is a vital component of the human brain, playing a role in motor movement regulation and balance control. It is located in the lower back part of the brain, behind the fourth ventricle, the pons, and the medulla oblongata. It is composed of two hemispheres joined by the vermis and is further subdivided into three lobes – anterior, posterior, and flocculonodular.
The cerebellum communicates constantly with the cerebral cortex, taking higher-level instructions from the brain, processing them through the cerebellar cortex, and then sending messages to the cerebral motor cortex to make voluntary muscle contractions. The superior cerebellar peduncle connects the cerebellum to the midbrain and allows for arm and leg coordination. The inferior cerebellar peduncle connects the medulla and cerebellum, using proprioceptors to maintain balance and posture.
Damage to the cerebellum can result in movement disorders, including uncoordinated voluntary movements and problems maintaining balance and posture. Patients with cerebellar damage may develop stereotyped postural strategies, such as a wide-based stance, to compensate for their balance issues. They may also experience disturbances of voluntary movements, called ataxia, which involve tremors with fine movements such as writing or buttoning clothing.
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The frontal lobe is involved in movement, personality, and decision-making
The frontal lobe, located at the front of the brain, is involved in a wide range of functions, including movement, personality, and decision-making. It is responsible for controlling voluntary movements, such as walking and running, through the primary motor cortex. This region sends signals to muscles, enabling intentional actions such as moving your hand to pick something up or walking around. Damage to this area can result in difficulty controlling certain muscles, including those involved in speech.
The frontal lobe also plays a crucial role in personality development and regulation. It is rich in dopamine-sensitive neurons, which contribute to feelings of reward and motivation. Damage to this area, as seen in the case of Phineas Gage, a famous patient in neuroscience, can lead to dramatic personality changes. Gage, who suffered a severe brain injury when a railroad spike pierced his frontal lobe, experienced a shift from being mild-mannered to impulsive and rude.
In addition to movement and personality, the frontal lobe is essential for decision-making and cognitive functions. It is involved in logic, reasoning, judgment, and creativity. The prefrontal cortex, a part of the frontal lobe, facilitates abstract thinking, planning, and decision-making. It helps individuals weigh pros and cons, set goals, and understand consequences. Damage to the frontal lobe can impair these abilities, making it difficult for individuals to gather information, remember past experiences, and make decisions effectively.
Furthermore, the frontal lobe contributes to social understanding and behaviour. It helps individuals understand social norms and interact with others appropriately. It plays a role in empathy, allowing people to understand and react to the feelings of others. Overall, the frontal lobe's involvement in movement, personality, and decision-making highlights its significance in our daily functions and interactions.
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Frequently asked questions
The frontal lobe, specifically the motor cortex, controls voluntary muscles.
Voluntary movements include chewing, playing sports, walking, talking, running, writing, and pressing a button.
The motor cortex is a zone of the cerebrum located behind the frontal lobe. It sends neural messages through the brain stem and spinal cord to the muscles being commanded.
Involuntary muscles are controlled by other regions of the brain, such as the hypothalamus.
